Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.
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SPEECH-ENABLED INFORMATION PROCESSING
FIELD OF THE INVENTION
The invention relates to telecommunications and more particularly to
interactive speech applications.
BACKGROUND OF THE INVENTION
Computer-based speech-processing systems have become widely used for a
variety of purposes. Some speech-processing systems provide Interactive Voice
Response (IVR) between the system and a caller/user. Examples of applications
performed by IVR systems include automated attendants for personnel
directories,
and customer service applications. Customer service applications may include
systems for assisting a caller to obtain airline flight information or
reservations, or
stock quotes.
Some customer services are also available through the computer-based global
packet-switched network called the Internet, especially through the world-wide-
web
("the web") using world-wide-web pages ("web pages") forming websites. These
websites typically include a "home page" containing some information and links
to
other web pages of the website that provide more information and/or services.
Web
pages of various companies allow users to obtain company information, access
personnel directories, and obtain other information, e.g., stock quotes or
flight
information, or services, e.g., purchasing products (e.g., compact discs) or
services
(e.g., flight tickets). Many websites contain similar categories of web pages
of user
options such as company information, a company directory, current news about
the
company, and products/services available to the user. The web pages can be
navigated using a web browser, typically with navigation tools such as
"back,''
"forward," and "home."
SUMMARY OF THE INVENTION
In general, in one aspect, the invention provides an interactive speech system
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including a port configured to receive a call from a user and to provide a
communication link between the system and the user, memory having personnel
directory information stored therein including indicia of a plurality of
people and
routing information associated with each person for use in routing the call to
a
selected one of the plurality of people, the memory also having company
information
stored therein associated with a company associated with the interactive
speech
system, and a speech element coupled to the port and the memory and configured
to
convey first audio information to the port to prompt the user to speak to the
system,
the speech element also being configured to receive speech from the user
through the
port, to recognize the speech from the user, and to perform an action based on
recognized user's speech, the speech element being further configured to
convey
second audio information to the port in accordance with the company
information
stored in the memory.
Implementations of the invention may include one or more of the following
features.
The speech element is configured to convey speech in at least a partially web-
analogous format. The speech element is configured to, in response to a
request by
the user recognized by the speech element, provide information, stored in the
memory, according to the request, and to route the call to a person indicated
by the
user's request according to the routing information associated with the
person.
Portions of the company information stored in the memory are associated with
each
other in pages of information according to a plurality of categories of
information
including how to contact the company. The speech element is configured to act
upon
the user's speech if the user's speech is within a vocabulary based upon
information
of a page most recently accessed by the speech element. The categories of
information further include information about the location of the company, and
products, if any, and services, if any, offered by the company. The company
information stored in the memory includes information available on a website
of the
company. The memory and the speech element are configured to convey the
company information to the user with an organization different than an
organization
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of the company information provided on the company's website. The speech
element
is configured to access pages of information in response to spoken commands
from
the user associated with functions commonly provided by web browsers. The
commands include "back," "forward," and "home."
The speech element is configured to perform transactions indicated by the
user's speech.
The system further includes a speech application monitor configured to
monitor activity of the speech element and corresponding incoming speech from
the
user. The speech element is configured to store conversation data in the
memory
indicative of at least one of: the user's speech; if the user's speech was
accepted as
recognized, what action if any the speech element took; and if the user's
speech has a
confidence below a predetermined threshold; and the speech application monitor
is
configured to report indicia of the conversation data stored by the speech
element.
The speech application monitor is coupled to the memory through the Internet.
The speech element is configured to perform at least one of disambiguating the
user's speech and confirming the user's speech.
The system further includes a control unit coupled to the memory and
configured to receive a control signal from outside the system and to modify
information content of the memory in response to the control signal. The
control unit
is configured to add information to the memory, to delete information from the
memory, and to alter information of the memory.
The speech element is further configured to convey information to the user to
prompt the user to provide disambiguating information regarding a person and
to use
the disambiguating information to disambiguate between which of multiple
people the
user desires to contact.
In general, in another aspect, the invention provides a computer program
product including computer-readable instructions for causing a computer to
establish a
communication link with a user in response to receiving a call from the user,
to
retrieve information from a memory having personnel directory information
stored
therein including indicia of a plurality of people and routing information
associated
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with each person for use in routing the call to a selected one of the
plurality of people,
the memory also having company information stored therein associated with a
company associated with the interactive speech system, to convey first audio
information to the user to prompt the user to speak, to receive speech from
the user, to
recognize the speech from the user, to perform an action based on recognized
user's
speech, and to convey second audio information to the user in accordance with
the
company information stored in the memory.
Implementations of the invention may include one or more of the following
features.
The instructions for causing the computer to convey the second audio
information cause the computer to convey the second audio information in at
least a
partially web-analogous format. The instructions for causing the computer to
convey
the second audio information cause the computer, in response to a request by
the user
recognized by the computer, to provide information, stored in the memory,
according
to the request, the computer program product further including instructions
for
causing the computer to route the call to a person indicated by the request
according
to the routing information associated with the person. The memory stores
information
in pages according to a plurality of predetermined categories of information,
and the
instructions for causing the computer to recognize the user's speech cause the
computer to use a vocabulary associated with a current page of speech to
recognize
the user's speech. The company information stored in the memory includes
information available on a website of the company, and the instructions for
causing
the computer to convey the second audio information to the user cause the
computer
to convey the second audio information with an organization different than an
organization of the company information provided on the company's website. The
instructions for causing the computer to retrieve information cause the
computer to
retrieve information in response to spoken commands from the user associated
with
functions commonly provided by web browsers. The commands include "back,"
"forward," and "home."
The computer program product further includes instructions for causing the
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computer to perform transactions indicated by the user's speech.
The computer program product further includes instructions for causing the
computer to store conversation data in the memory indicative of at least one
of: the
user's speech; if the user's speech was accepted as recognized, what action if
any the .
5 computer took; and if the user's speech has a confidence below a
predetermined
threshold, and to report indicia of the stored conversation data.
The computer program product further includes instructions for causing the
computer to perform an action based on an attempt to recognize the user's
speech.
The computer program product further includes instructions for causing the
computer to receive a control signal and to modify information content of the
memory
in response to the control signal. The instructions for causing the computer
to modify
information content of the memory include instructions for causing the
computer to
add information to the memory, to delete information from the memory, and to
alter
information of the memory.
The computer program product further includes instructions for causing the
computer to: convey information to the user to prompt the user to provide
disambiguating information regarding a person, and to use the disambiguating
information to disambiguate between which of multiple people the user desires
to
contact.
In general, in another aspect, the invention provides a method of interfacing
with a user through an interactive speech application, the method including
receiving
an incoming call from the user, establishing a communication link with the
user,
retrieving a portion of stored data indicative of speech for presentation to
the user, and
presenting the portion of stored data as speech to the user in a web-analogous
form.
Implementations of the invention may include one or more of the following
features.
The stored data are stored in groups according to associated titles indicative
of
the content of the data in each corresponding group, and the presenting
includes
conveying the title of the portion of stored data to the user as speech. The
method
further includes receiving speech from the user, converting the user's speech
into
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electrical indicia of the user's speech, retrieving another portion of stored
data in
accordance with the electrical indicia, presenting the another portion of
stored data to
the user including conveying a title of the another portion of stored data to
the user as
speech. The user's speech is the title of the another portion of stored data.
The
indicia of the user's speech are indicative of the title of the another
portion of stored
data. The indicia of the speech are indicative of a synonym of the title of
the another
portion of stored data. The user's speech includes a web-analogous navigation
command. The web-analogous navigation command is selected from the group
consisting o~ 'back," "forward," "home," "go to," and "help."
The stored data are grouped according to content of the data, and the
presenting includes conveying a speech indication to the user of the data
content of
the portion of stored data, the indication including the word "page."
In general, in another aspect, the invention provides a monitoring system for
monitoring at least one speech application system, the monitoring system
including a
computer network connection, and a monitoring unit coupled to the speech
application
system and to the computer network connection and configured to receive data
from
the at least one speech application system through the computer network
connection,
to process call records of indicia related to calls associated with the speech
application
system, and to produce reports indicative of the indicia related to the calls.
Implementations of the invention may include one or more of the following
features.
The monitoring unit is coupled to the speech application system through the
computer network connection and the monitoring unit is remotely located from
the at
least one speech application system. The computer network connection is
coupled to
the at least one speech application system through the Internet. The
monitoring unit is
configured to access logs of call records stored in the at least one speech
application
system. The monitoring unit is coupled through the computer network connection
and
the Internet to a plurality of distributed speech application systems and is
configured
to receive data from each of the speech application systems through the
network
connection, to process records of call events associated with each of the
speech
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application systems, and to produce reports indicative of the indicia related
to the calls
for each speech application system.
The monitoring unit is configured to transmit signals to the at least one
speech
application system to alter operation of the at least one speech application
system.
The signals are adapted to cause malfunctioning communication lines of the at
least
one speech application system to be effectively rendered busy. The signals are
adapted to cause services of the at least one speech application system to be
restarted.
The signals are adapted to cause configuration file patches to be inserted
into
configuration files in the at least one speech application system.
The monitoring unit is configured to produce an indication of a frequency of a
selected call event.
The monitoring unit is configured to produce an alert regarding a selected
call
event. The alert is an indication that a characteristic of a selected call
event deviates
more than a predetermined amount from a predetermined reference value for that
characteristic.
The monitoring unit and the speech application system are disposed proximate
to each other.
Various aspects of the invention may provide one or more of the following
advantages. People can access information about, and obtain services from, a
company using a telephone or other similar device. Information and/or services
can
be provided and accessed in an audio form and in a format similar to websites,
and
can be accessed without a computer. A caller can access information and
services
through natural language speech. A company can leverage an investment in a
website
or other information proliferation to provide similar information and/or
services in an
audio, interactive speech format. Callers can navigate through company
information
and/or services using commands commonly used by web browsers. Interactive
speech
performance can be monitored. The monitoring can be performed remotely, such
as
through the Internet. Multiple interactive voice response systems can be
remotely
monitored. One or more interactive voice response systems can be remotely
controlled. The remote control can include establishing and/or altering data
such as
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configuration parameters and data used in recognizing speech and/or performing
actions in response to speech or other sounds.
These and other advantages of the invention, along with the invention itself,
will be more fully understood after a review of the following drawings,
detailed
description, and claims.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a simplified block diagram of a speech system according to the
invention.
FIG. 2 is a simplified block diagram of a computer system connected to a
server through a network link.
FIG. 3 is a simplified block diagram of an IVR system, shown in FIG. 1, and
an analog line, a Single Mail Transfer Protocol server, and a fax server.
FIG. 4 is a simplified block diagram of an analysis/reporting service
connected
to multiple IVR systems.
FIG. 5 is a simplified block flow diagram of an interactive speech process
according to the invention.
FIG. 6 is a flow diagram of a call routing process shown in FIG. 5.
FIG. 7 is a flow diagram of an information retrieval process shown in FIG. 5.
FIG. 8 is a flow diagram of a transaction processing process shown in FIG. 5.
FIG. 9 is a flow diagram of a process for reporting and analyzing interactive
conversations
FIG. 10 is a simplified block diagram of an engine system shown in FIG. 3.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
Overview
Embodiments of the invention provide speech-based information processing
systems that are complementary to existing world-wide-web websites and
systems.
For example, an enterprise or company that has a web-based securities trading
system
may configure a speech-based information processing system that permits users
to be
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connected to a broker or inquire about the status of trades placed through the
web
using the speech-based system, accessed by telephone, and having a user
interface that
is consistent with the enterprise's website. As used herein, the term
"company"
includes any variety of entity that may use the techniques described herein.
The entity
may or may not be a business, and may or may not be intended to earn profit.
As
such, the term "company" includes, but is not limited to, companies,
corporations,
partnerships, and private parties and persons. "Company" is used because
websites
typically use this term, although not necessarily as it is used herein.
Embodiments of the invention support classes of applications that are
presently available using web technologies including, but not limited to,
communications applications, information retrieval, and transaction
processing.
Preferably, all such applications are available through a single, consistent
user
interface that is analogous to a website, including hyperlinks; the user may
speak a
command for any of several applications without regard to whether one or more
servers or systems actually run the applications.
The user can navigate through information presented in a directed dialogue
format. During interactive conversation, the user is presented with a set of
options
with corresponding commands for the user to speak. For example, the user may
hear,
"You can say 'Contact Us,' 'Company Information,' or 'Products."' The user may
also be presented with a short description of the function of the command,
e.g., "You
can say 'Fax It' to receive a facsimile about the information that you just
heard."
Using a directed dialogue can help limit the recognizable vocabulary and speed
speech recognition.
Communications applications may include call routing, in which the caller
speaks the name of a party or describes a department to which a call is to be
routed.
Transaction processing applications may include non-revenue support
processing, for example transferring funds from one bank account to another.
Since
an enterprise typically does not generate revenue for this type of support
function, use
of a speech interface and speech-based system as disclosed in this document
represents a large potential savings in processing costs.
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Transaction processing applications may also include e-commerce or purchase
transactions. Consequently embodiments of the invention may provide a speech-
based gateway to a general-purpose transaction processing system for carrying
out
commercial transactions, through an online commerce system or a conventional
back-
s office commerce system.
Transaction processing may also include interactive dialogues for enabling a
caller to register for events. The dialogue may include identifying an
individual by
name, address, fax number, etc. The dialogue may also include obtaining
payment
information by credit card and the like.
10 Applications may also include registering users to obtain privileged access
to
one or more services or sets of information, or registering users to enable
users to use
personalized menus, affinity buying, or "cookies". Applications may also
include
linking a speech-processing system to other speech-processing systems by one
or
more circuit-switched carriers, or by Internet telephony ("Voice Over Internet
Protocol") connections. Applications may also include providing pointers on a
website to one or more speech-processing systems so that users may know what
services are speech-activated and may rapidly move from the website to
services
provided by the speech-processing systems.
Embodiments of the invention also improve access to legacy servers.
Embodiments of the invention serve as front ends or gateways to back-office
data
servers in the same way that a web server may sit in front of legacy data.
Embodiments of the invention may be configured in association with a web
server to provide a convenient interface and presentation layer for the same
information retrieval functions or transactions carried out by the web server.
Accordingly, an enterprise can leverage its web investment. Functions that are
commonly found on websites may now be accessed by telephone using a natural
language speech interface in which the user speaks, e.g., the name of the
desired
function, such as Contact Us, Job Opportunities, About Us, etc. A particular
enterprise may also speech enable functions that are unique to that
enterprise. For
example, a courier service may offer a Drop-Off Locator service or a Rate
Finder
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through its website. The same services may be accessed by telephone using
embodiments of the invention, whether or not such services are provided on a
website.
The caller simply speaks the name of the desired service in response to a
system
greeting. The information provided in these services may be provided by real-
time
links to external content providers, as well as more complex actions.
Information retrieval applications may encompass very simple information
updates, such as tracking packages that have been shipped using a courier
service,
tracking luggage moved by an airline, obtaining the balance of a bank account,
etc., as
well as more complex actions.
Another information retrieval application involves providing driving
directions
to a caller who is trying to reach a location of an enterprise. The caller
calls a speech-
based system according to embodiments of the invention, and in response to a
greeting, says "company information, directions" or the like. In response, the
caller is
prompted with a query, "What direction are you coming from?" The caller
responds
with a direction or a point of identification, such as a major road. In
response, the
caller hears, "I'll read you the directions". The directions are then
presented to the
caller. As a result, speech delivery of a useful information retrieval
function is
provided.
Information retrieval functions may also include retrieval of press releases,
data sheets, and other electronic documents, and transmission of the
electronic
documents by text to speech, fax or other media.
Applications may be configured in a variety of ways. For example,
embodiments may include tools, packages, and a configuration wizard that
enables an
operator to set up a new application that provides different information
retrieval and
transaction processing functions.
Accordingly, embodiments are disclosed that improve telephone answering,
leverage a company's investment in the world-wide web and provide a
cornerstone or
gateway for a variety of information retrieval and transaction processing
functions.
Embodiments of the invention provide an interactive speech system following a
web-
based model for organization, information content, and services. A user can
use a
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telephone to place a call and access information and/or services by speaking
naturally
with an interactive voice response (IVR) system. Embodiments of the invention
thus
allow callers to be routed to employees of a selected company by name and/or
department, and provide access to company information and transactions with
web-
s site-like organization, terms, and commands. Embodiments of the invention
are
implemented using software to control a computer processor.
Exemplary embodiments of the invention include a base platform and tool set,
and a collection of configurable, pre-packaged application modules. With the
base
platform and tool set, the tool set can be used to customize a system to
provide an
individually-tailored interactive speech application. With the collection of
configurable pre-packaged application modules, a customer can essentially
purchase a
turn-key product and with only minor modifications, and configure the product
to
meet the customer's needs. As embodiments of the invention provide web-site-
like
functionality in an IVR system, embodiments of the invention may be referred
to as a
SpeechSiteTM IVR system including a SpeechSiteTM IVR interface. Within the
SpeechSiteTM IVR system, speech pages, that are analogous to web pages,
provide
information and/or services, with different speech pages providing different
groups or
categories of information and/or services similar to information and/or
services
commonly provided by websites and in an organization typical of websites.
The following description assumes that a company buys and uses the
described embodiments. Thus, it is assumed that the described embodiments
provide
information about and products/services of the purchasing company. Entities
other
than companies, however, are acceptable.
STRUCTURAL CONFIGURATION
Overall System
Referring to FIG. 1, an interactive speech system 10 includes a user/caller
12,
a Public-Switched Telephone Network (PSTN) 14, an IVR system 16, a Simple Mail
Transfer Protocol (SMTP) server 18, a firewall 20, a network, here the
Internet, 22,
and an Analysis/Reporting (A/R) service 24. As shown, communication between
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each of the components of system 10 is bi-directional. The caller 12 has
access to a
phone 26 and a facsimile machine 28. The caller 12 can communicate with the
PSTN
14, or vice versa, through either the phone 26 or the fax 28. The caller 12
communicates through the PSTN 14 with the IVR system 16. The IVR system 16
interacts with the caller 12 by playing prompts to the caller 12 in a directed
dialogue
format and recognizing (or at least attempting to recognize) speech from the
caller 12.
The IVR system 16 also communicates with the A/R service 24 via the Internet
22.
The SMTP server 18 provides an interface between the IVR system and the
Internet
22. The firewall 20 protects communications from the IVR system 16 through the
Internet 22 and vice versa using known techniques. The IVR system 16 includes
an
engine system 30, an administration system 32, and a configuration and log
system
34.
The systems 30, 32, 34 process the interactions between the IVR system 16
and the caller 12, configure the engine system 30, and store configuration
parameters,
prompts and other data, and records of interactions with the caller 12,
respectively, as
described in more detail below.
THE INTERACTIVE VOICE RESPONSE SYSTEM
Introduction
The IVR system 16 can be implemented using a personal computer. For
example, the following components and/or features could be used as part of a
computer to implement the IVR system 16: a single-processor work station using
an
INTEL~ PENTIUM~ III (NT workstation certified) processor with a clock speed of
450 MHz or higher; 384 Mb RAM or more; 9GB of disk space and a high speed DLT
backup system; a 10/100 Ethernet connection and a 56K modem for connectivity;
a
monitor, a mouse, and a keyboard, for data displaying, entering and
manipulating
data; D41 ESC and D240 SC-Tl telephony interface cards; an Antares 6000/50
digital
signal processor; an operating system of NT 4.0 work station service pack 5;
an
environment of Artisoft~ 5.0 Enterprise; an Access or SQL server; an IIS or
Pure
Information Services HTTP server and a Microsoft~ FTP service for a Windows NT
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Server for FTP service or an Apache Software Foundation HTTP server; a one-
line
license from Lucent for text-to-speech (TTS); PoIyPM or PCAnywhere programs
for
remote (e.g., desktop) management.
Referring to FIG. 2, a computer system 50 for implementing the IVR system
16 includes a bus 52 or other communication mechanism for transferring
information,
and a processor 54, coupled with the bus 52, for processing information. The
computer system 50 also includes a main memory 56, such as a random access
memory (RAM) or other dynamic storage device, coupled to the bus 52 for
storing
information and instructions to be executed by the processor 54. The main
memory
56 also may be used for storing temporary variables or other intermediate
information
during execution of instructions to be executed by the processor 54. The
computer
system 50 further includes a read only memory (ROM) 58 or other static storage
device coupled to the bus 52 for storing static information and instructions
for the
processor 54. A storage device 60, such as a magnetic disk or optical disk, is
configured for storing information and instructions and is coupled to the bus
52.
The computer system 50 is coupled via the bus 52 to a display 62, such as a
cathode ray tube (CRT), for displaying information to a computer user. An
input
device 64, such as a keyboard including alphanumeric and other keys, is
coupled to
the bus 52 for communicating information and command selections to the
processor
54. Another type of user input device included in the system 50 is cursor
control 66,
such as a mouse, a trackball, or cursor direction keys, for communicating
direction
information and command selections to the processor 54 and for controlling
cursor
movement on the display 62. This input device typically has control of the
cursor in
two axes, a first axis (e.g., x) and a second axis (e.g., y), that allows the
device to
specify positions on a plane.
According to embodiments of the invention, the computer system 50 can
generate a speech recognition application in response to the processor 54
executing
one or more sequences of one or more instructions contained in the main memory
56.
Such instructions may be read into the main memory 56 from another computer-
readable medium, such as the storage device 60. Execution of the sequences of
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instructions contained in the main memory 56 causes the processor 54 to
perform the
processes described herein. In alternative embodiments, hard-wired circuitry,
firmware, hardware of combinations of any of these and/or software may be used
to
implement embodiments of the invention.
5 The term "computer-readable medium" as used herein includes any medium
capable of providing instructions to the processor 54 for execution. Such a
medium
may take many forms including, but not limited to, non-volatile media,
volatile media,
and transmission media. Non-volatile media includes, for example, optical or
magnetic disks, such as the storage device 60. Volatile media includes dynamic
10 memory, such as the main memory 56. Transmission media includes coaxial
cables,
copper wire and fiber opticables, including the wires that comprise the bus 52
Transmission media can also take the form of acoustic or electromagnetic
(e.g., light
waves), such as those generated during radio-wave and infra-red data
communications.
15 Common forms of computer-readable media include, for example, a floppy
disk, hard disk, magnetic tape, or any other magnetic medium, a CD-ROM, any
other
optical medium, punchcards, papertape, any other physical medium with patterns
of
holes, a RAM, a PROM, an EPROM, a FLASH-EPROM, any other memory chip or
cartridge, (e.g., electrical and/or electromagnetic, including optical) a
carrier wave as
described hereinafter, or any other medium from which a computer can read.
Various forms of computer-readable media may be involved in carrying one or
more sequences of one or more instructions to the processor 54 for execution.
For
example, the instructions may initially be carried on a magnetic disk of a
remote
computer. The remote computer can load the instructions into its dynamic
memory
and send the instructions over a telephone line using a modem. A modem local
to the
computer system 50 can receive the data on the telephone line and use an infra-
red
transmitter to convert the data to an infra-red signal. An infra-red detector
can receive
the data carried in the infra-red signal and appropriate circuitry can place
the data on
the bus 52. The bus 52 can carry the data to the main memory 56, from which
the
processor 54 can retrieve and execute the instructions. The instructions
received by
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the main memory 56 may optionally be stored on the storage device 60 either
before
or after execution by the processor 54.
The computer system 50 also includes a communication interface 68 coupled
to the bus 52. The communication interface 60 provides a two-way data
communication coupling to a network link 70 coupled to the SMTP server 18. For
example, the communication interface 68 may be an integrated services digital
network (ISDN) card or a modem to provide a data communication connection to a
corresponding type of telephone line. As another example, the communication
interface 68 may be a local area network (LAN) card to provide a data
communication
connection to a compatible LAN. Wireless links may also be implemented. The
communication interface 68 can send and receive electrical and/or
electromagnetic
(including optical) signals that carry digital data streams representing
various types of
information.
The computer system 50 can send messages and receive data, including
program code, through the SMTP server 18, the network link 70 and the
communication interface 68. For example, code can be downloaded from the
Internet
22 (FIG. 1) for generating a speech recognition application as described
herein. The
received code may be executed by the processor 54 as it is received, and/or
stored in
the storage device 60, or other non-volatile storage for later execution. In
this manner,
the computer system 50 may obtain application code in the form of a carrier
wave.
Referring to FIG. 3, the IVR system 16 includes the engine system 30, the
administration system 32, the configuration and log system 34, a remote
control
system (RCS) 36, a support system 38, and a monitoring interface system 40.
These
systems can communicate bi-directionally as indicated by the double-ended
arrows in
FIG. 3. Additionally, the remote control system 36 can communicate bi-
directionally
with each of the systems 30, 32, 34, 38, and 40. The administration system 32
is
responsible for the configuration, reporting, and monitoring of the IVR system
16.
The administration system 32 includes a web application server 42 and
application
server logic 44. Access to the administration system 32 is provided through
the web
application server 42, which is, e.g., an HTTP server although other types of
servers
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are acceptable. The application server 42 is controlled by the application
server logic
44, that is implemented with software.
THE ADMINISTRATION SYSTEM
The administration system 32 is responsible for configuring other components
of the IVR system 16. The administration system 32 is configured to access
information stored in the configuration and log system 34 and to provide this
information as configuration information to other components of the IVR system
16.
For example, the administration system 32 is configured to read configuration
data
from the configuration and log system 34 and to provide this information to
the
engine system 30. Included in the configuration data sent to the engine system
30 are
data that determine which speech pages are active, and the pages' content
including
locations of prompts, which grammars to use and which vocabularies to use.
Speech pages are grouped according to configuration information from the
administration system 32 into speech modules. Different speech modules provide
different categories of information and services provided by the pages within
the
modules. Each module contains multiple speech pages. Exemplary modules are
SpeechAttendant, Contact Us, and Company Information. The SpeechAttendant
module includes pages for a personnel directory for the company. The Contact
Us
module includes information for contacting the company, e.g., an email
address,
mailing address, street address and directions, fax number and a telephone
number.
The Company Information module includes pages describing general company
information such as the type of business and/or services provided by the
business,
news releases, and geographical areas serviced.
The administration system 32 is also configured to update/edit information
contained in the configuration and log system 34. Thus, for example, the
administration system 32 can access and edit employee name and telephone
lists,
company information such as news, and call flow control data.
THE ENGINE SYSTEM
The engine system 30 is responsible for and configured for executing the
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speech interface between the IVR system 16 and the caller 12 (FIG. 1 ) and
connecting
with the telephony system. Thus, the engine system 30 is connected to the PSTN
14
for bi-directional communication and is adapted to execute a call flow with
the caller
12 including recognizing speech, playing prompts, retrieving data, routing
calls,
disambiguating responses, confirming responses, selecting pages to link to,
and
connecting to support devices (e.g., TTS and fax). The engine system 30 is
configured to recognize speech using known techniques, here parsing the speech
into
segments and applying acoustic models. Functions of the engine system 30 are
implemented using DialogModuleTM speech-processing software units available
from
SpeechWorks~ International, Inc. of Boston, MA. For at least each of the
functions
of call routing, information retrieval, and transaction processing, the speech
engine 30
is adapted to attempt to recognize the caller's speech and act accordingly.
The engine system 30 also includes an execution engine 80 configured to
control the processing of the engine system 30. This processing includes
retrieval and
playing of prompts, speech recognition, and monitoring and reporting of
interactions
between the engine system 30 and the caller 12. The engine system 30 is
controlled
by instructions and/or data stored in the engine system 30 or the
configuration and log
system 34 or provided by the caller 12.
Referring also to FIG. 10, the engine system 30 includes the execution engine
80, DialogModuleTM speech-processing units 300, a SMARTRecognizerTM speech
recognizer 302 (available from SpeechWorks~ International, Inc.), a prompt
unit 304,
a record unit 306, all operating in a Service Logic Execution Environment
(SLEE)
308 including an Operating System (OS), and operating on hardware 310. The
SLEE
is the computational environment in which call logic executes. This
environment
includes any tools provided by the Artisoft~ Visual Voice service platform for
call
and event handling. The execution engine 80 is configured to control operation
of the
engine system 30.
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The engine system 30 is configured to recognize speech and to adapt to new
speech. The speech-processing units 300 are configured to process waveforms of
received utterances by the caller 12 and SLEE logs (discussed below) and to
provide
the processed data to the recognizes 302. The recognizes 302 uses acoustic
models,
semantic models (probabilities of word phrases), pronunciation graphs, and a
dictionary, stored in the IVR system 16, to attempt to recognize a word or
words in
the caller's utterance. Acoustic models represent statistical probabilities
that given
waveforms relate to associated parts of speech. The recognizes 302 can produce
an N-
best list of N words or phrases most likely to be what the caller 12 spoke.
Each item
in the N-best list has a corresponding confidence score representing the
likelihood that
the identified word or phrase is actually what the caller 12 spoke. The engine
system
30 is configured to load the models and parameters that control the engine
system 30
each time the engine system 30 runs. These data are stored in the
configuration and
log system 34 such that they are replicable in an off line batch processing
mode.
The recognizes 302 can build or add to a dictionary and adapt acoustic models,
semantic models, and pronunciation graphs to adjust probabilities linking
utterance
waveforms to speech. Acoustic model retraining can be performed during
inactive
times of the IVR system 16. The recognizes 302 is configured to build and
evaluate
semantic models using parsed and raw text and to use the SLEE logs to
automatically
build the semantic models.
To implement the auto attendant functionality, the speech engine 30 is
configured to perform call routing functions. These functions include
recognizing
names and/or departments and/or positions of employees, including synonyms of
the
employees' names, departments, and/or positions, and providing prompts to the
caller.
To perform the call routing features, the execution engine 80 is configured to
retrieve
information from the configuration and log system 34 and to compare this with
the
caller's speech to determine whether the spoken name, department or position
corresponds to a person or department of the company or business associated
with the
IVR system 16. The engine system 30 can disambiguate responses, e.g., by
prompting the caller 12 to identify an employee's department in addition to
the
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employee's name. The call routing functions also include the execution engine
80
connecting the caller to the requested person/department. In particular, the
execution
engine 80 is configured to transfer calls using blind, flash-hook transfers in
accordance with data stored in the configuration and log system 34. The engine
5 system 30 can be configured to perform other types of transfers such as
supervised
transfers.
For information retrieval functions, the engine system 30 can identify a
specific speech page requested by the caller 12 or determine which page will
contain
the information requested. The engine system 30 is configured to recognize
speech
10 from the caller 12 in order to determine what information the caller 12 is
requesting.
In response to recognized speech from the caller 12, the engine system 30 is
configured to access the specified/determined page, and play prompts to the
caller
regarding the information requested. Thus, for example, the engine system 30
can
link to a "Contact Us" page in response to the user/caller 12 saying "Contact
Us"
15 when at an appropriate page (one providing for links to the contact us
page).
Additionally, the engine system 30 can link to the Contact Us page in response
to the
user, when at an appropriate page (one providing for links to the contact us
page),
requesting information from the Contact Us page. For example, the caller 12
could
say "Directions to Boston" and the engine system 30 will link the caller 12 to
the
20 Contact Us page.
The engine system 30 is also configured to perform transactions available to
the caller 12 for the specific IVR system 16. To perform transactions, the
engine
system 30 is configured to identify a specified page or to determine a page
containing
information or services (e.g., stock trading) requested by the caller 12, to
access the
specified/determined page, to play prompts for the caller 12, and to
perform/initiate
functions specified by the caller 12. The engine system 30 can recognize the
caller's
speech and associate the recognized speech with data stored in the
configuration and
log system 34. In accordance with instructions stored in the engine system 30
and/or
data, including instructions where appropriate, stored in the configuration
and log
system 34, the engine system 30 can perform the transactions indicated in
accordance
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with the data provided by the caller 12.
To control the interactive conversation with the caller 12 the engine system
30
can interact with the caller 12 through the PSTN 14 and the configuration and
log
system 34. The engine system 30 can receive speech from the caller 12 through
the
PSTN 14. The engine system 30, under control of the execution engine 80, is
configured to attempt to recognize the speech from the caller 12. In order to
recognize the speech, the engine system 30 can access the configuration and
log
system 34 for information indicating what speech is recognizable by the IVR
system
16. The engine system 30 is configured to, under the control of the execution
engine
80, manage the conversation between the IVR system 16 and the caller 12. The
execution engine can instruct the engine system 30 to output prompts, stored
in the
configuration and log system 34, to the caller 12 depending on whether the
engine
system 30 recognized speech from the caller 12. These prompts can be, e.g., to
request information from the caller 12 in accordance with the previously-
recognized
speech, to ask the caller 12 to retry the speech for unrecognized speech or
low-
confidence recognized speech, or other appropriate error messages for
nonspeech
information received by the engine system 30.
The engine system 30 is configured to communicate with the caller 12 in a
directed dialogue manner that guides the caller 12 to speak within a limited
vocabulary to achieve the caller's desired results. The engine system 30
presents the
caller with possible commands to speak, and uses a recognition vocabulary that
includes the possible commands (e.g., "Contact Us"), as well as some synonyms
or
other words that convey similar intent (e.g., "Directions"). The recognition
vocabulary changes with different stages of the interactive dialogue with the
caller 12.
The caller 12 can also say any of several "global" or "universal" commands
that are
available at any speech page such as "Help," "Back," or "Forward." The "Back"
and
"Forward" commands would only work if there are speech pages that are behind
or in
front of the current speech page in the history of speech pages that the
caller 12 has
visited. Utterances other than those permitted would result in error messages
to the
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caller 12. Limiting the available recognizable speech can help improve
recognition
accuracy and speed, and overall robustness of the IVR system 16.
The engine system 30 is configured to use known techniques to recognize and
respond to requests by the caller 12. For example, the speech from the caller
12 can
be parsed into units of speech and transformed by a digital signal processor
to produce
speech unit vectors. These vectors are grouped into speech segments that may
be of
varying lengths. The segments are converted into feature vectors that are
analyzed
with respect to linguistic constraints (e.g., the recognition vocabulary) to
produce an
N-best list of the N word strings with the highest confidence scores.
The engine system 30 interacts with the caller 12 by presenting a user
interface
that translates into an audio format the visual format provided in typical
websites,
including functionality provided by typical website browsers. The user
interface is
accomplished by the prompts accessed by the engine system 30 and presented to
the
caller 12. Similar to information provided to a person browsing a website,
prompts
played by the engine system 30 stored in the configuration and log system 34
can,
e.g., inform the caller of the current location (e.g., "Home page") or the
location being
transferred to (e.g., "transferring to the Contact Us page"). These prompts
played for
the caller 12 use terminology (e.g., for links) associated with websites such
as "page",
"Contact Us", "Company Information", "going back to page...", "moving forward
to
... page". As another example, the caller 12 can be played a prompt for
information
that says "You can say [Page 1 ] [Page 2] . ..." The [Page 1 ] and [Page 2]
prompts are
text prompts that are configurable, e.g., by storing the custom text in the
configuration
and log system 34, and are retrieved to play the prompt to the caller 12. This
text is
substituted in the greeting, e.g., in real time, by the engine system 30 to
provide the
customized text to the caller 12 based on the information stored in the
configuration
and log system 34. Exemplary customized pages would be for, e.g., specific
products
of a company, specific divisions of a company and/or specific services of a
company.
Still other prompts can present queries to the caller 12, such as yes/no
queries.
Information presented to the caller 12 by the engine system 30 may be
organized
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differently than a corresponding website containing essentially the same
information
as that presented to the caller 12.
As part of the web-analogy user interface, the engine system 30 is configured
to respond to website-like commands to navigate through the information in the
IVR
system 16. A caller can say commands typically provided by web browsers such
as
"home", "back", "forward," "help," and "go to" and the engine system 30 is
configured to recognize such commands and act accordingly. The engine system
30
thus can transfer the caller 12 back to the previous page, or to the next
page, of
information in the history of pages visited, or back to the home page, in
response to
the caller 12 saying, respectively, the exemplary commands listed above.
For each speech page, there may be links particular to that page for which the
engine system 30 will prompt the caller 12. For example, the home page can
have
specific links to a Company Information page, a Contact Us page, and a
Products/Services page, and prompts informing the caller 12 of the links. For
example, the caller 12 can be told "You can say 'Company Information,'
'Contact
Us,' or 'Products and Services."' The engine system 30 can transfer to any of
these
specific pages as requested by the caller 12.
The engine system 30 is also configured to provide search services and
automatic faxing services to the caller 12. From an appropriate point in a
dialogue
with the IVR system 16, the caller 12 can say "find it." In response to this
request/utterance, the engine system 30 can search the stored speech pages for
the
indicated text and/or information. The caller 12 at anytime may also say "fax
it" and
the engine system 30 is configured to respond to this request by faxing the
content of
the current page (associated with the current speech page) to a fax number
specified
by the caller 12. The fax number may be previously stored and, possibly,
confirmed,
or may be requested by the engine system 30 in response to the fax it command.
The engine system 30 is configured to record call events and other
transactions
in the configuration and log system 34. Call events are the various stages of
the
interactive conversation between the IVR 16 and the caller 12. These events
include
requests by the caller 12, attempted recognition by the engine system 30,
indications
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24
of whether the caller's speech was recognized, whether the speech was rejected
as a
low-confidence recognition or was not recognized, actions initiated by the
engine
system 30, and prompts played to the caller 12. The events can include what
pages
the caller was directed to, what commands the caller 12 requested and in what
sequence, and which actions the engine system 30 performed. The engine system
30
is configured to send indicia of the call events to the configuration and log
system 34
for storage for future reference. The engine system 30 is configured to send
indicia of
some call events each time the call event occurs, while transferring indicia
of other
call events only upon the occurrence of certain conditions, and can be
configured not
to send indicia of other call events at all. For example, the engine system 30
can send
indicia each time that a low-confidence rejection occurred, or that a high-
confidence
acceptance occurred (e.g., a person was successfully connected to using auto
attendant
features). The engine system 30 is also configured to produce reports based on
call
statistics of the call events for storage in the configuration and log system
34 and/or
for retrieval by the monitoring interface system 40.
THE CONFIGURATION AND LOG SYSTEM
The configuration and log system 34 includes a log storage area 86, a database
storage area 88, and a general storage area 90. The configuration and log
system 34 is
configured to store the information used by the administration system 32, the
engine
system 30, the support system 38 and the monitoring interface system 40, and
to
interact bi-directionally with each of these systems. Thus, each of these
systems 30,
32, 38, 40 can retrieve information from, and store information to, the
configuration
and log system 34.
The database 88 stores the configuration files and content of the speech
pages.
The content of the speech pages resembles content and format commonly
available
on websites. The configuration files are used to configure the systems 30, 32,
36, 38,
40. These files store the information necessary to configure each of these
systems 30,
32, 36, 38, 40 during configuration and set up as described below. These files
can be
established and/or modified by a manufacturer and/or purchaser of the IVR
system 16
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to provide and/or alter custom configurations. The database 88 is also
configured to
store a variety of information relating to the speech pages. For example, the
database
88 is configured to store information related to prompts. Prompt data include
the
identification, date recorded, name of person recording the prompt, source,
and type
of the prompt. Additionally, whether the prompt is published, a unique user
interface
name for the prompt, and the text of the prompt are stored in the database 88.
Also,
the location of the prompt in the database 88 and the date that the prompt was
produced are stored in the database 88. Information is also stored in the
database 88
for linking multiple prompts together to form phrases or other segments of
prompts.
The database 88 also stores information relating to speech modules. This
information includes identifying information for speech modules and speech
pages,
including the contents of each of the modules and pages. This identifying
information
is adapted to be used by the speech engine 30 to locate, retrieve, and process
the
various speech modules and speech pages, including the prompts contained
therein.
The database 88 also stores data relating to speech pages. Links between
pages and components of the pages are contained in the database and help the
speech
engine 30 link to other pages and/or modules to more readily retrieve
information and
perform other actions. The database 88 also stores information linking
DialogModuleTM speech-processing units 300 (FIG. 10) to specific speech pages
and/or speech modules. The linking information for DialogModuleTM speech-
processing units 300 (FIG. 10) provides a mapping for determining which
DialogModuleTM speech-processing units 300 (FIG. 10) to execute when executing
a
speech page.
Data stored in the database 88 also provides links between data serving as
synonyms for one another. This helps to increase accuracy of recognition for
an item
when synonyms are available for that item.
The database 88 also stores several other types of information. Included in
this information is information to help support navigation of speech pages,
including
navigation terms and links to navigation functions, and key words used to
locate a
speech page when executing a "find it" function by the execution engine 80 in
the
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26
engine system 30. A user dictionary is also stored within the database 88. The
database 88 also contains information related to the operations of the
company. For
example, the dates and/or hours of operation of the company are stored in the
database
88. The database 88 also stores the information for the personnel directory
for the
auto attendant functionality. Information stored in the database 88 for the
personnel
directory is stored in fields of data. Exemplary fields include personnel
names,
nicknames, positions, departments, synonyms of entries in any of these fields,
and
telephone extensions for persons, rooms, and departments, or other information
for
transferring/routing callers to persons and/or departments, etc. These fields
can be
updated to reflect new personnel, changes of departments, changes in names of
departments, changes in names and people and additional nicknames or other
synonyms.
The stored speech-page content includes all the information, including
prompts (e.g., queries and information), layout and links, for each page of
the IVR
system 16. Speech-page content is divided into fields of data that can be
selected/chosen and modified to custom configure the page content before
transfer to
a purchaser/customer, or by a customer of the IVR system 16. The content of
the
speech pages can be updated as necessary by modifying the data fields, e.g.,
to update
stock prices, provide can ent daily news, or to indicate any changes that may
have
occurred in the company.
The storage area 90 stores all prompts, fax pages, GIFs, and speech models.
The prompts are all the audio information to be relayed to the caller 12. For
example,
the prompts include queries to the caller 12 and statements of information for
the
caller 12. The fax pages are the data to be transmitted to the fax 28 (FIG. 1
) of the
caller 12 in response to the caller requesting faxed information, e.g., the
caller 12
saying "fax it" or the like. Graphical information in the form of Graphics
Interchange
Format (GIF) files can be included in the fax pages. Speech models are used by
the
engine system 30 to recognize portions of speech in order to recognize words
and/or
phrases spoken by the caller 12.
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27
The log storage area 86 is configured to store logs of call events and other
information needed by the system 40, e.g., in Service Logic and Execution
Environment (SLEE) logs. Logs of the call events includes statistics regarding
e.g.,
call time, call length, speech pages requested, success rates of recognition,
out of
vocabulary recognitions, failed recognitions, and commands used.
THE SUPPORT SYSTEM
The support system 38 is configured to be invoked by the administration
system 32 and/or the engine system 30 and to provide support features for
these
systems 30, 32. The support system 38 includes a text-to-speech (TTS) feature
92, a
log converter 94, a fax feature 96, a report generator 98, and a speech
adapter 100.
The TTS 92 allows the engine system 30 to output speech or other appropriate
audio to the caller 12 based upon text stored in the IVR 16. The TTS 92 can be
implemented using known techniques, such as the Lucent TTS engine. The TTS 92
allows the IVR 16 to be updated quickly. For example, a news release can be
quickly
stored in the configuration and log system 34 as text and can immediately be
output as
speech to a caller 12 using the TTS 92 and the engine system 30. A recording,
such as
by a famous personality of that news release can be made later and used in
place of
the TTS 92 converting the text of the news release to appropriate speech using
the
engine system 30. Other portions of the IVR 16 can also be updated in this
manner,
for example, the list of employees in the personnel directory.
The log converter 94 is configured to convert information in the logs stored
in
the storage area 86 to an appropriate format for processing by the report
generator 98.
Here, the log converter 94 is configured to access SLEE files stored in the
storage
area 86 and to convert these files into National Center for Supercomputing
Applications (NCSA) standard logs. The log converter 94 can effectively
convert
indicia of accesses by callers to the IVR 16 into the equivalent of a website
page "hit",
and stores these hits in a file. Thus, the log converter 94 is configured to
store a file
containing an ID of the caller 12 (e.g., a phone number), the date and time of
a request
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28
by the caller 12, and indicia of a request from the caller 12 for information
or an
action. The logs stored by the log converter 94 are stored in the
configuration and log
system 34.
The fax feature 96 is configured to process fax requests from the caller 12 to
fax the requested information to the fax 28 (FIG. 1) accessible by the caller
12. For
example, the fax feature 96 can be implemented using WinFax Pro 9Ø This
implementation of the fax feature 96 supports both RightFax servers and
Internet
servers. The fax feature 96 can fax information to a fax number associated
with the
fax 28, provided by the caller 12, through a fax server 97.
The report generator 98 is configured to access logs and other information
stored in the configuration and log system 34 and to manipulate these data to
produce
various reports. For example, the report generator 98 can manipulate the logs
stored
by the log converter 94 to produce reports relating to speech page hits. The
report
generator 98 is configured to produce reports indicating the number of calls
per hour,
the number of calls per hour in all speech modules, and the number of operator
transfers per hour. The report generator 98 may also be able to produce a
report
indicating the number of calls from a given device as identified by its
automatic
number identifier (ANI) in a selected day/week/month. These reports are
produced in
written and graphical formats, and are downloadable and can be imported into a
database.
The speech adapter 100 is configured to adapt tools used by the engine system
to help improve the speech recognition by the engine system 30. The speech
adapter 100 can be implemented with LEARN 6.0 software available from
SpeechWorks~ International, Inc. of Boston, Massachusetts. The speech adapter
100
25 can access information stored in the configuration and log system 34,
analyze this
information, and determine how to adapt the acoustic models, pronunciation
graphs,
and/or semantic models stored in the configuration and log system 34 to
improve
speech recognition by the engine system 30. The speech adapter 100 is also
configured to update/change the acoustic models, pronunciation graphs, and/or
30 semantic models according to these determinations. The new models and
graphs are
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29
stored again in the configuration and log system 34 for use by the engine
system 30 in
recognizing speech from the caller 12.
THE REMOTE CONTROL SYSTEM
The remote control system (RCS) 36 is configured to provide remote control
of the IVR 16 through an analog communication line 104. The RCS 36 includes a
remote access system (RAS) 106 controlled by appropriate software, here,
PCAnywhere 108. The RAS 106 communicates with the analog line 104 through a
modem 110.
The RCS 36 allows arbitrary control of the IVR 16 through an NT window.
For example, the RCS 36 is configured to allow start/stop processing, to
modify the
configurations of the systems 30, 32, 34, 38, 40, including data stored
therein, to
access the administration system 32 and to enable/disable communication lines
connected to the IVR 16.
THE MONITORING INTERFACE SYSTEM
The monitoring interface system 40 provides monitoring functions for the IVR
16 and includes a system monitor 112, a prompt monitor 114, and a tuning
monitor
116. Each of these monitors 112, 114, 116 is configured to retrieve
information from
and store information to, in the form of ulaw files (~-law files; word
waveforms), the
configuration and log system 34, and to bi-directionally communicate with the
SMTP
server 18. The prompt monitor 114 is configured to monitor prompt changes and
provide alerts as to the changes.
The system monitor 112 is configured to monitor computer functions of the
IVR 16, to take appropriate actions in response to the monitored functions and
to
provide a "base heartbeat" to the A/R service 24 (FIG. 1 ). The base heartbeat
is a
message sent to the A/R service 24 to inform the A/R service 24 that the IVR
16 is
operational and functioning with normal operational parameters. Alarms and
alerts
are provided by the system monitor 112 for hardware and telephony errors,
resource
limits, run time errors, and/or transactional errors. The errors for the
resource limits
CA 02379853 2002-O1-17
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apply to the application software code in the IVR 16. Run time errors are
provided
for SLEE, speech recognizer, and DialogModule~ speech-processing unit
libraries.
The SLEE libraries are configured to accept the call from the caller 12 and
invoke the
engine system 30 including its speech recognizer. Run time and transactional
errors
5 in the IVR 16 software code include all varieties of errors encountered in
processing
the call from the caller 12. The system monitor 112 can report transaction
errors by
storing indications of these transaction errors in the configuration and log
system 34.
The system monitor 112 is also configured to perform some remedial action such
as
restarting selected non-critical services of the IVR 16. Alarms and alerts can
be sent
10 by the system monitor 112 to the A/R service 24 (FIG. 1) via the Internet
(FIG. 1).
The tuning monitor 116 is configured to monitor and analyze speech
performance regarding the interaction between the caller 12 and the IVR 16.
The
tuning monitor 116 is configured to compute performance statistics from the
SLEE
logs stored in the configuration and log system 34 and to track the
performance
15 statistics. From the performance statistics, the tuning monitor 116 can
send alerts
about these performance statistics. The tuning monitor 116 can also send, for
external
monitoring, the SLEE logs and waveforms of portions of speech from the caller
12
that are flagged as potentially problematic waveforms. The tuning monitor 116
can
also output status messages regarding conversation statistics. These alerts,
logs,
20 waveforms, and messages can be sent by the tuning monitor 116 over the
Internet 22
(FIG. 1 ) to the A/R service 24 (FIG. 1 ).
The tuning monitor 116 is configured to provide numerous reports regarding
performance statistics of the conversation between the caller 12 and the IVR
16. The
tuning monitor 116 can analyze the performance statistics according to several
criteria
25 such as transaction completion rates for important transactions,
DialogModuleTM
speech-processing unit completion rates, failed calls, caller-perceived
response time,
personnel names not accessed within predetermined amounts of time, average
call
time, percentage of short calls, numbers of disconnected versus transferred
calls,
number of calls transferred to operator, and call volume. Which transactions
are
30 designated as important transactions may be configured upon system setup or
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modified later. DialogModule"~ speech-processing unit completion rates
information
includes how much confirmation is occurring, and how much and often failures
occur.
Information regarding DialogModule~ speech-processing unit completion rates is
formatted according to speech pages associated with the DialogModule~ speech-
processing units 300 (FIG. 10). Caller-perceived response time can be used to
determine whether the IVR 16 is being overloaded. The predetermined time for
personnel names not being used can be selected as desired, e.g., 1, 6, and/or
12 weeks.
Reports regarding the number of disconnected calls versus transferred calls,
and the
number of calls transferred to operators may be useful in analyzing the auto
attendant
performance.
The tuning monitor 116 also can provide several business reports. For
example, reports for the number of calls per hour, number of calls per hour in
important dialogue legs, the number of operator transfers per hour, and the
number of
calls from a given ANI in a predetermined time period are provided. The number
of
calls per hour are provided in a downloadable format as both text and graphs.
Important dialogue legs can be defined by the configuration file stored in the
configuration and log system 34. The predetermined amount of time for the ANI
reports can be, e.g., a day, a week, and/or a month. These reports are
provided in an
exportable format via a text file for loading into a database for business
data mining
and other reporting functions.
Alarms can be triggered by the tuning monitor 116 for a wide variety of
failures and/or performance conditions. These alarms are sent as structured
messages,
using, e.g., Single Network Management Protocol (SNMP) or email, to one or
more
destinations. Alarms may help off site monitoring of system performance by a
customer operations center, an off site outsourcing monitoring company, and/or
the
entity selling and/or configuring the IVR 16.
THE ANALYSIS/REPORTING SERVICE
The tuning monitor 116 can send reports over the Internet 22 (FIG. 1 ) to the
A/R service 24 (FIG. 1). Referring again to FIG. l, the A/R service 24 is
configured
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to monitor performance of the IVR 16 and to provide alarms to initiate
diagnostic
action regarding the IVR performance. The diagnostic action can be taken by,
for
example, the vendor of the IVR 16 such as SpeechWorks~ International, Inc. The
A/R service 24 is configured to access data in, and retrieve data from, the
configuration and log system 34, to analyze these data and to determine
appropriate
actions, to produce appropriate alarms, and/or to produce appropriate reports.
The
A/R service 24 is configured to periodically access and/or receive data such
as files of
recorded utterances and SLEE logs stored in the configuration and log system
34 for
use in recognition, tuning, monitoring and report production.
One alarm producible by the A/R service 24 is for potentially high OOV rates.
A high OOV rate can be caused, e.g., by the list of names in the personnel
directory
stored in the configuration and log system 34 not being maintained. Thus, when
the
caller 12 asks to be routed to a particular name, the IVR 16 may reject the
requested
name as being unrecognized despite the fact that the requested person is an
employee
of the company serviced by the IVR 16.
Alarms and/or reports can be produced by the A/R service 24 for likely
candidates for synonym/nickname identification. When an unrecognized phrase or
a
low-confidence phrase is accepted as recognized (with high confidence) on
retry (e.g.,
caller: "your CEO"; IVR: "I did not understand. Please say the first and last
name.";
caller: "Stuart Patterson.") the phrase used by the caller 12 in the first try
is a good
candidate as an additional synonym for the person recognized in the second
try. The
A/R service 24 can produce a report indicating the potential synonyms (e.g.,
CEO)
and the recognized speech (e.g., Stuart Patterson).
Alarms can also be produced by the A/R service 24 for repeated bad
pronunciations. A high percentage of confirmations for a given phrase spoken
by the
caller 12 is an indication that the IVR 16 is programmed with a poor
pronunciation
relative to the phrase. An alarm indicating repeated confirmation of
identified
words/phrases can be used to initiate action to adjust the pronunciation
recognized by
the IVR 16 to reduce the number of confirmations required for the particular
word/phrase.
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The A/R service 24 also is configured to produce alerts, alarms, and/or
reports
for names no longer being recognized by the IVR 16. A high rate of a name
having a
low-confidence score that previously had a high-confidence score can indicate
any of
several problems such as poor pronunciation recognition and/or high noise
levels
and/or that the person is a former employee and should be listed in the
database 88 as
having left the company.
The A/R service 24 is configured to monitor confidence distributions to help
manage recognition thresholds for confidence scores. The IVR 16 may adapt to
improve recognition of the caller's speech to increase recognition accuracy.
In so
doing, confidence score distributions across all utterances may shift. A fall
in the
percentage of rejected utterances, however, may indicate a rise in false
acceptances
(i.e., misrecognitions that are accepted as being valid) due to acceptance
thresholds
that are too low. Conversely, if the rejection thresholds are too high,
rejection rates
may be artificially high, inhibiting true recognition accuracy from being
realized. The
A/R service 24 can monitor the confidence distributions and affect the
thresholds to
help achieve proper thresholds to help realize true recognition accuracy. The
A/R can
also produce alarms indicating, or other indicia of, confidence scores for
personnel,
and rejection rates.
The A/R service 24 can also provide indicia of disambiguation configuration
problems. Alarms can be generated if the disambiguation prompt to the caller
12 is
unsuccessful in helping the caller 12 to distinguish the information the
caller 12 is
seeking. For example, if the disambiguation prompt requests the caller 12 to
indicate
the department of a person being sought, but the caller 12 cannot decide in
which
department the desired person works, then an indication (such as a time out of
the
response period) of this failure may be noted. Also, indications may be stored
and
reported if the disambiguation resulted in the incorrect person being
identified.
Reports of repeated failures can help detect that improper disambiguation
information
is provided for a person.
The A/R service 24 can receive, through a secure communication, such as a
secure HTTP transfer, or SMTP mail, data representing recorded utterances by
callers,
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event logs, and other logs, statistics, etc. The recorded utterances and SLEE
logs are
usable by the A/R service 24 in recognition, tuning and monitoring. The IVR 16
is
configured to periodically send the data representing the recorded utterances
and
SLEE logs to the A/R service 24.
The A/R service 24 can also monitor the performance of the recognizes 302
contained in the engine system 30. For example, the A/R service 24 can perform
off
line recognition testing using a known test sequence.
The A/R service 24 is also configured to update information in the
administration system 32. The A/R system 24 can both add and remove word
pronunciations, and add names or words to the vocabularies. Also, the service
24 can
modify Backus-Naur Form (BNF) grammars used in the IVR 16. This may help
process utterances such as "Mike Phillips, please." The service 24 can also
add or
update acoustic models, recognizes parameters, and semantic models (e.g.,
prior
probabilities of names). Run time system upgrades and updates can be performed
by
the service 24. Also, the A/R service 24 is configured to control the amount
of
waveform and configuration logging through the interface 40. This control
includes
turning waveform logging on and off and switching from logging a sampling of
waveforms, to logging all waveforms, to logging only error waveforms.
The A/R service 24 is configured to take appropriate support actions based
upon various alarms and alerts stemming from the monitoring of the IVR system
16.
The A/R service 24 is configured to put bad communication lines into a
constant state
of busy. The A/R service 24 can also restart portions of the IVR system 16,
collect
long files for debugging, and insert configuration file patches into damaged
configuration files.
Referring to FIG. 4, the A/R service 24 is configured to service multiple,
distributed IVR systems. As shown, the A/R service 24 can service the IVR
system
16 through the SMTP server 18 and firewall 20 via the Internet 22 as well as
IVR
systems 120, 122 and 124. The systems 120, 122, 124 may be configured
differently
for individual companies. The A/R service 24 services the IVR systems 120,
122, 124
via the Internet 22, and a firewall 126, and an SMTP server 128. Thus, as
shown, the
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A/R service 24 can service multiple IVR systems 16, 120, 122, 124 via multiple
SMTP servers 18, 128 and also multiple IVR systems 120, 122, 124 through a
single
SMTP server 128. The IVR systems 16, 120, 122, 124 may be geographically
distributed remotely from each other.
5 Alarms such as emails or SNMP traps, can be sent by the A/R service 24 to an
entity such as SWI, or to another vendor of the IVR 16, or other entity, for
analysis to
determine potential corrective action. The A/R service 24 is configured to
send the
alarms when performance deviates more than a predetermined amount from an
expected behavior (e.g., an expected value such as a frequency or quantity) of
the
10 monitored statistic. Included in the A/R service 24 is a configuring entity
including
transcribers for transcribing stored caller utterances in accordance with the
alarms and
alerts or other notifications by the A/R service 24. People at the configuring
entity are
provided for reviewing the transcribed utterances, comparing these utterances
with the
vocabularies, or otherwise analyzing the transcribed utterances to determine
15 appropriate corrective action, if any. Such action includes using the RCS
36 to
adapt/reconfigure the IVR 16, e.g., to reduce OOVs, to update pronunciations
or other
information, and/or to correct information stored in the IVR 16.
CONFIGURATION AND SETUP
20 How the system 10 is configured and set up depends on the type of system
chosen by the customer. The customer can choose a base platform and
configuration
tools or a collection of configurable models. If the customer chooses the base
platform and tools, then the customer can configure and customize the product.
The
customer can provide configuration/customization data to the vendor and/or
25 configuration entity, e.g., SpeechWorks~ International, Inc. for the
configuration
entity to configure the system 10.
If the customer chooses the base platform and tools, then the customer inputs
the data for the desired functionality and any customization parameters. The
customer
would need to input, either through a database download, or individual
entries,
30 relevant information for an auto attendant, such as personnel names,
nicknames,
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departments, and extensions, as well as any appropriate synonyms such as job
titles/positions. Additionally, the customer would provide information for the
content
of the speech pages and instructions for any links to other pages, and
instructions for
transactions to be supported by the speech pages. Much of the content and
functionality, including for transactions, is provided in the base platform,
but the
customer would need to supply customized data and instructions. The customer
can
select configuration parameters to customize the performance of the system,
for
example whether disambiguation is possible for an auto attendant. As another
example, for an event registration tool the customer would record the date,
event title,
and prompts for information needed from a caller to register for the upcoming
event.
The customer could, in a similar manner, modify/update the initial
configuration/setup
as necessary to accommodate for changing information, such as recent events,
additional or fewer personnel, changes of name, delays or other alterations in
events,
etc.
If the customer selects the collection of configurable models for
configuration
by the vendor or other entity, then the customer would provide the relevant
information to the configuring entity, e.g., SpeechWorks~ International, Inc.
The
customer would provide content information for the speech pages, relevant
personnel
directory information for an auto attendant as discussed above, and desired
options for
configuration parameters. The configuring entity uses this information, and
its
expertise to configure the system for the customer. Additionally, the
configuring
entity updates the configuration/setup as required by the customer after the
initial
configuration/setup.
No matter whether the customer or other entity performs the configuration, the
configuration files are written to and/or amended by the administration system
32
(FIG. 1 ) and read by the engine system 30 (FIG. 1 ) for execution.
OPERATION
In operation, the IVR system 16 interacts with the user/caller 12 in
accordance
with the user interface that guides the caller 12 through a web-model speech
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recognition process that includes performing operations indicated by the
caller 12. In
accordance with the web model, the caller 12 is typically first presented with
the
home speech page (unless the caller 12 accesses a different speech page
directly) that
provides the caller 12 with a variety of options. The caller 12 can select
from the
S options presented by saying any of the specified words/phrases, or in a
natural
language manner saying what information and/or service the caller 12 desires.
Terminology analogous to typical websites is used to help the caller 12
navigate
through the various speech pages by the caller 12 saying appropriate
utterances. For
each utterance by the caller 12, disambiguation and/or retrials of recognition
can be
preformed, where the system is configured to do so. At each stage of the
conversation
between the IVR system 16 and the caller 12, the caller 12 is informed of what
page is
being loaded (e.g. "loading Contact Us page"), and when the speech page has
been
loaded, what is the page title for the information about to be presented to
the caller 12
(e.g., "Contact Us page. To call us toll free...."). The A/R service 24
analyzes and
monitors information regarding conversations between the IVR system 16 and the
caller 12 and provides appropriate reports, alerts, and/or alarms for use by
the
customer and/or a configuring entity (e.g., SpeechWorks~ International, Inc.)
to
determine whether updates to the system 10 are warranted.
Referring to FIGS. 1, 2, and 5, an interactive conversation process 200 begins
at stage 202 when the caller 12 dials a telephone number associated with the
IVR
system 16. The caller 12 is connected from the caller's phone 26 through the
PSTN
14 to the IVR system 16. Connection is established between the IVR system 16
and
the caller 12 through the PSTN 14 for bi-directional communication between the
caller 12 and the IVR system 16.
At stage 204 the IVR system 16 plays prompts to the user 12 indicating that
the user 12 has reached the home page of the SpeechSiteTM IVR system 16. For
example, a prompt such as "home page" or "you have reached the [company x]
SpeechSiteTM voice recognition system home page" is played to the caller 12.
Alternatively, if the user 12 dialed a number associated with a specific
speech page
other than the home page, then the information for the dialed page can be
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prompted/played to the caller 12. The information prompted to the caller 12
includes
various options as to what other pages the user 12 can access and/or general
information contained on the home page. The prompts can inform the caller 12
about
speech modules of the SpeechSiteTM IVR system. In this example, the prompts
include "You can link to a personnel directory by saying 'Company Directory';
you
can find out how to contact us by saying 'Contact Us'; you can learn about the
company by saying 'Company Information'; to perform [transaction x] say
[perform
transaction x]."' The transaction can be, e.g., to buy stock or other goods.
Thus,
[perform transaction x] and [transaction x] can both be "buy stock" in this
example.
Thus, the prompts give the caller 12 instructions how to initiate call routing
through a
Company Directory (Auto Attendant), information retrieval (Contact Us and
Company Information), and transaction processing, respectively. The
information
also includes instructions as to how to navigate through the various speech
pages
prompted to the caller 12 including that the caller 12 can navigate the
SpeechSiteTM
IVR system by speaking terms associated with website analogous functions, such
as
"back," "forward," and "home" as well as other functions such as "find it,"
"fax it,"
and "where am I?"
At stage 206, the caller speaks into the phone 26 to provide speech 208 to
navigate through the speech pages. The speech 208 may be in response to
prompts
played by the IVR system 16, such as requesting a specific speech page, or can
be a
natural language request for information or other actions. The speech 208
represents
speech-related information, but not necessarily an analog or a digitized
speech
utterance. For example, the speech 208 may represent the set of N-best word
strings
generated as output by the recognizer 302.
At stage 210, the engine system 30 discriminates between available sub-
processes to determine which sub-process is the appropriate one for processing
the
request indicated by the speech 208. To discriminate between sub-processes
(each of
which may contain one or more speech modules) the engine system 30 compares
the
speech 208 with sub-process titles prompted to the caller 12, and/or multiple
vocabularies, each of which is associated with at least one of the available
sub-
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processes. In the latter case the vocabularies contain synonyms of the titles
presented
to the caller 12. For example, if the caller 12 says "Directions to Boston"
the process
200 will proceed to stage 214 for call information retrieval from the Contact
Us page.
If the speech 208 is matched with a sub-process title (e.g., if the speech 208
is
"Company Information"), then the engine system 30 directs the appropriate
corresponding sub-process to process the speech 208 at stage 212 for call
routing, at
214 for information retrieval, and/or at stage 216 for transaction processing.
The various sub-processes 212, 214, and 216 process the speech 208 as
described in more detail below. Appropriate prompts are played to the caller
12
indicating to which sub-process the caller 12 is being directed. For example,
the
engine system 30 plays a prompt "Transferring to the Company Directory Page"
(or
"Transferring to the Personnel Directory Page" or "transferring to the Call
Routing
Page") if the caller 12 is being routed to the call routing sub-process 212.
Prompts
"Transferring to the [information retrieval] page'' and "Transferring to the
[transaction
processing] page" are played to the caller 12 if the caller 12 is being
transferred to
these sub-processes 214 or 216, respectively. "Contact Us" or "Company
Information" replace [information retrieval] and "Stock Buying" replaces
[transaction
processing] in this example. Alternatively or in addition, prompts are played
to the
caller 12 indicating that the appropriate page is being loaded, e.g., "Loading
the
Company Directory Page."
The sub-processes 212, 214, and 216 interact with the caller 12 to determine
specific responses or actions, such as providing information or performing
actions
appropriate for the speech 208 or further speech from the caller 12.
At stage 218, the engine system 30 provides the appropriate response or
performs the appropriate action as determined by the sub-processes 212, 214,
and
216.
Referring to FIGS. 1, 3, 5, and 6, at stage 220 of the call routing process
212,
the caller 12 is presented with the call routing page. The engine system 30
plays
prompts for the caller 12 to indicate the information associated with the call
routing
page and links to other pages from the call routing page 220. The engine
system 30
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plays a personnel directory prompt to have the caller 12 to speak the name or
department of a person to whom the caller 12 wishes to speak. The IVR system
16
receives the caller's speech 208 in response to the prompt.
At stage 222, the engine system 30 obtains a call-routing vocabulary from the
5 configuration and log system 34. This information can be obtained before,
after, or
during stage 220. The call routing vocabulary in this example includes data
related to
a personnel directory. Other information, however, is possible for other
examples
such as information related to an airline flight scheduling system.
At stage 224, the engine system 30 determines N word strings that may
10 possibly correspond to the intended words/phrases from the caller 12. These
N-best
word strings (the N-best list) are compared by the engine system 30 to the
call routing
vocabulary obtained at stage 222. For example, if the confidence score of the
highest-
confidence word string in the N-best list exceeds an upper threshold, then the
word is
considered to be recognized and accepted. Low-confidence word strings with
15 confidence scores below a lower threshold are rejected. Word strings with
confidence
scores between the lower and upper thresholds are queued for disambiguation,
as may
also be the case if confidence scores for multiple word strings exceed the
upper
threshold.
To help uniquely identify the word strings spoken by the caller 12, at stage
20 225, disambiguation is performed by the engine system 30 if needed. For
example, if
there are two employees with the name spoken by the caller 12, the engine
system 30
attempts to distinguish between them by having the caller 12 identify the
department
of the desired employee. The engine system 30 thus prompts the caller 12 to
"say the
name of the department of the person that you are trying to contact."
Depending on
25 the caller's response to the disambiguation prompt, the engine system 30
chooses one
of the N-best word strings as the word string spoken by the caller 12.
At stage 226, the engine system 30 determines appropriate responsive action
according to the comparing of the speech with the call-routing vocabulary at
stage
224. This determination can result in the call being routed to an identified
person, or
30 performing a requested action.
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At stage 228 the caller's call is routed to a person identified by the
caller's
speech. The engine system 30 uses the call-routing information, such as an
extension,
associated with the person identified at stage 226 as being the person to whom
the
caller 12 wishes to speak to connect the caller 12 and the desired person. For
example, the caller 12 is routed to John Doe's extension if the speech was
"John
Doe," or to another speech page or an operator, e.g., if the speech was
"flight
schedule", such that the caller 12 is routed to an operator for scheduling
flights.
At stage 230, the engine system 30 carries out an action other than call
routing,
as indicated by the speech such as playing or faxing information.
Referring to FIGS. 1, 3, 5, and 7, an information retrieval process 214 is
shown in FIG. 7. For the following description an example of obtaining
information
from a Company Information page is described. This is not intended to be a
limiting
example; other possibilities for information to be retrieved, including other
pages to
retrieve information from, are within the scope of the invention. At stage
232, an
information retrieval page is presented to the caller 12. The engine system 30
plays a
prompt "Loading Company Information page" and when this page has been loaded
plays an additional prompt "Company Information page." Following these
prompts,
the engine system 30 plays prompts indicating information on the Company
Information page such as links to other speech pages, and general company
information. This general information can include the general nature of the
company,
including the technology of the company, and the company's products and/or
services.
At stage 234 the engine system 30 obtains an information retrieval vocabulary
for use in recognizing the caller's speech. The engine system 30 obtains this
information from the configuration and log system 34. This information is
based on
the information contained on the Company Information page and those pages
identified as links from the Company Information page. The engine system 30
plays a
prompt such as "You can be linked to pages with the following information by
saying
the names of the pages: 'Company History', 'News and Press Releases', or
'Current
Events'."
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42
At stage 236, the engine system 30 matches the N-best word strings for the
caller's spoken response to the prompts to the information retrieval
vocabulary. The
engine system 30 develops several word strings that may represent what the
caller 12
spoke. The N-best of these word strings are selected by the engine system 30
for
comparison with the information retrieval vocabulary to determine which of the
word
strings the caller 12 spoke.
To help uniquely identify the word strings spoken by the caller 12, at stage
238, disambiguation can be performed by the engine system 30. The engine
system
30 can play appropriate prompts for the caller 12 such as "I think you said
'company
history' and not 'current events'. Is that correct?" Depending on the caller's
response, the engine system 30 chooses one of the N-best word strings as the
word
string spoken by the caller 12.
At stage 240, the engine system 30 retrieves the resource requested by the
caller 12. In response to the uniquely-identified word string determined at
stage 236,
and possibly 238, the engine system 30 uses the information from the
identified word
string to access the configuration and log system 34 to retrieve the
information
associated with the caller's request. For example, if the caller 12 responded
to the
disambiguation question above with a "yes" answer, then the engine system 30
would
retrieve information relating to the company history, such as a Company
History
speech page stored in the configuration and log system 34. The speech engine
30
plays a prompt "Loading Company History page."
At stage 242, the engine system 30 delivers the requested resource to the
caller
12. In this example, the engine system 30 prompts the caller 12 with the
associated
information of the Company History page. For example, the prompt could be
"Company History page. You may link to the following speech pages...."
Referring to FIGS. l, 3, 5, and 8, a transaction processing process 216 is
shown in FIG. 8. For the following description an example of booking an
airline
flight is used. This is not intended to be a limiting example, other
possibilities for
transactions to be processed including purchasing products or commodities are
within
the scope of the invention. At stage 244, a Flight Reservation page is
presented to the
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43
caller 12. The engine system 30 plays a prompt "Loading Flight Reservation
page"
and when this page has been loaded plays an additional prompt "Flight
Reservation
page." Following these prompts, the engine system 30 plays prompts indicating
information on the Flight Reservation page such as links to other speech
pages, and
general flight reservation information contained. This general information can
include information about pricing, inflight services, and/or travel procedures
such as
check-in time and luggage limits. At stage 246 the engine system 30 obtains a
flight reservation vocabulary for use in recognizing the caller's speech. The
engine
system 30 obtains this information from the configuration and log system 34.
This
information is based on the information contained on the company Flight
Reservation
page and those pages identified as links from the company information page.
The
engine system 30 plays a prompt such as "You can be linked to pages with the
following information by saying the names of the pages: Domestic Flights, on
International Flights."
At stage 248, the engine system 30 matches the N-best word strings to the
flight reservation vocabulary. The engine system 30 develops several word
strings
that may represent what the caller 12 spoke. The N-best of these word strings
are
selected by the engine system 30 for comparison with the flight reservation
vocabulary to determine which of the word strings the caller 12 spoke.
To help uniquely identify the word strings spoken by the caller 12, at stage
250, disambiguation can be performed by the engine system 30. The engine
system
can play appropriate prompts for the caller 12 such as "If you said
'Northwest,' say
'One,' If you said 'Southwest,' say 'Two,' Otherwise say 'Neither."' Depending
on
the caller's response, the engine system 30 chooses one of the N-best word
strings as
25 the word string spoken by the caller 12.
At stage 252, the engine system 30 produces one or more transaction requests
in response to the identified request by the caller 12. In response to the
uniquely-
identified word string determined at stage 248, and possibly 250, the engine
system 30
uses the information from the identified word string to access the
configuration and
30 log system 34 to retrieve the information for the transaction associated
with the
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caller's request. The transaction request will initiate the requested
transaction or
instruct appropriate hardware and/or software to perform the requested
transaction.
The transaction requests can be retrieved from storage in the configuration
and log
system 34 and/or custom produced by inserting values for variables in the
information
retrieved from the configuration and log system 34 or by completely producing
a
custom-built request. For example, if the caller 12 responded to the
disambiguation
question above by saying "One", then the engine system 30 would produce a
transaction request relating to Northwest Airlines, such as "Book a roundtrip
flight
from Washington, D.C., to Detroit, leaving March 1 at 8 a.m. and returning on
March
2 with a 10 p.m. departure time."
At stage 254, the engine system 30 delivers the transaction request to the
appropriate portion of the engine system 30, or to another appropriate
location, such
as a website server for Northwest Airlines. In this example, the engine system
30
executes the transaction according to the transaction request. Alternatively,
this
execution can include such actions as transmitting an order for stock, or
transmitting a
request over the fax server 97 to fax information to the caller's fax machine
28,
depending on the caller's request.
At stage 258, the engine system 30 produces a response to the executed
transaction. Here, the response indicates the success or failure of booking or
purchasing tickets for the requested flights, and if successful, pertinent
information
such as flight numbers, times, seats, and prices etc. Alternatively, the
response could
indicate the sale or purchase price of a stock, or the success or failure of
an attempt to
fax information to the caller 12, if these transactions were requested.
At stage 260, the engine system 30 prompts the caller 12 regarding the
response. For example, the engine system 30 can play prompts such as "You have
been booked on flight 123 leaving Washington, D.C., at 8:12 a.m. on March l,
arriving Detroit at 10:48 a.m.; and on flight 456 leaving Detroit at 9:47
p.m., arriving
in Washington, D.C., at 12:13 a.m. on March 3," or, e.g., "The requested
information
has been successfully faxed to (617) 555-1212."
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The caller 12 is returned to the transaction processing page 244 so that the
caller 12 can initiate another transaction if desired.
Referring to FIGS. 1, 3, S, and 9, a process 270 for reporting and analyzing
interactive conversations is shown in FIG. 9. At stage 272 the caller 12 and
has an
5 interactive conversation with other parts of the system 10. Data from this
conversation, including utterances by the caller 12 and/or actions taken by
the system
10 are stored/logged. The storing/logging can occur during or after the
conversation.
At stage 274, stored data from the interactive conversation are monitored
and/or reported. The reporting can be in the form of alarms or alerts, or in
formal
10 reports organizing the data for analysis. Alarms can highlight potential
causes of
errors in the system 10, or at least areas for improvement of the system 10.
Reports
can show the performance of the system 10. The performance characteristics
reported
are organized to help make the analysis, especially of correctable features of
the
system 10, easy. Performance characteristics are also organized to facilitate
15 performance reporting to the IVR customer, to indicate how well the
customer's
purchase is operating.
At stage 276, the monitored/reported data are analyzed. People at the
configuring entity, or other analysis entity, review the reports and/or alarms
regarding
performance characteristics/statistics of interest. For example, the people
can analyze
20 the characteristics to determine whether too many calls are failing to be
routed to
employees, or that too many calls are being routed to an operator or
disconnected
The people can also compare transcribed utterances that failed to result in
the caller 12
being connected to an employee with recognition vocabularies to determine OOV
utterances. A wide range of analysis can be performed at stage 276, of which
the
25 above analyses are examples.
From the analyses at stage 276, the people can determine what, if any,
corrective action can and/or should be taken. For example, it can be
determined that
an alternative pronunciation should be added to a recognition vocabulary, or
that a
person's name or transaction's title were mistakenly not added to appropriate
30 recognition vocabularies, to reduce OOVs. Also, it could be determined that
a
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disambiguation feature should be added to one or more portions of the
interactive
conversation process 200, e.g., to reduce the frequency of misdirected calls.
The
corrective action can be to use the RCS 36 to add, delete, or alter
information,
prompts, links, configuration parameters, etc. of the IVR 16 to help improve
operation
of the system 10. The corrective action determined in stage 276 is taken in
stage 278.
Other embodiments are within the scope and spirit of the claims. For example,
the A/R service 24, or one or more portions thereof, may be provided at the
location
of, or within, the IVR system 16. Also, portions of the system 10 may have
different
configurations than as described above. For example, environments other than
Artisoft~ 5.0 Visual Voice Enterprise may be used.
Also, different processes of analyzing performance data are possible. For
example, frequently occurring OOVs of the same utterance can be analyzed while
ignoring less common OOV utterances. OOV utterances with similar features can
be
grouped such that a person only listens to enough utterances from the group to
identify the OOV utterance. This can be accomplished by collecting utterance
waveforms (in the form of Maws) from all recognition failures, or low-
confidence
recognitions. Each ulaw is converted into a sequence of feature vectors (e.g.,
Mel-
Frequency Cersmal Coefficients (MFCCs)) using a standard recognizer front end.
An
MFCC vector is produced for each frame (e.g., lms) of speech. Similar
utterances are
clustered together using dynamic alignment of the feature vectors, or
clustering
techniques such as k-means. Each cluster represents a collection of example
utterances of an OOV, plus some noise. A human transcriber listens to a few of
the
utterances from a cluster to determine the primary OOV from the cluster. The
clustering helps the transcriber avoid listening to all the utterances to
identify an
OOV.
Still further, automatic techniques for transcribing utterances may be used.
Instead of being transcibed by humans, utterances may be transcribed, e.g., by
a
phone-loop recognizer to produce phonetic representations. A few utterances
from
each cluster of utterances can be transcribed in this manner. The phonetic
representations can be cross-referenced into a phonetic dictionary, or passed
to a
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human to verify the OOV utterance. The OOV utterances can be flagged for
consideration for corrective action. Alternatively, utterances or may be
compared
against a large dictionary (e.g., of names).
What is claimed is:
