ECOUTEURS SANS FIL ET EMETTEUR FM PORTATIF

WIRELESS HEADPHONES WITH PORTABLE FM TRANSMITTER

Abrégé français

Écouteurs sans fil permettant à l'utilisateur d'écouter un signal provenant d'un émetteur FM portatif à faible consommation d'énergie, branchable à un récepteur/amplificateur ordinaire portatif (ou non) ou à un lecteur de cassettes/disques compacts. Les fils d'interconnexion sont ainsi éliminés. Écouteurs et émetteur peuvent être accordés à un certain nombre de fréquences différentes afin de servir de multiples utilisateurs de la même région.

Abrégé anglais

Wireless headphones that allows the user to listen to a signal transmitted from a low
power consumption portable FM transmitter that can be plugged into conventional
portable (or in full size) receiver/amplifier or cassette, Compact Disc player. This eliminates
the use of interconnecting wires. Both headphones and transmitter may be tuned to a certain
number of different frequencies to allow multiple users in the same area.

Revendications

Claims:
The embodiments of the invention in which an exclusive property or privilege is claimed
are defined as follows:
1. Wireless headphones with portable FM transmitter comprising of
(a) a right and left earphone,
(b) a FM receiver built into the headphones connected to the power supply and the outputs
of the said receiver are connected to said earphones.
(c) a headphone antenna connected to the said FM receiver
(d) a plug-in transmitter comprised of:
-an accessory antenna for said transmitter;
-a housing for said accessory transmitter;
-a phono plug connected to the transmitter and positioned in such a way to allow it
to be inserted into a headphone jack of a conventional or portable receiver/amplifier,
cassette/Compact Disc player, television... wherein the audio output of said a conventional
or portable receiver/amplifier, cassette/Compact Disc player, television...is transmitted
from said accessory transmitter to said headphone receiver so that the user can listen to the
desired audio source without being tied by a cable to said audio source.
2. A FM headphone and FM transmitter according to claim 1, but they included frequency
synthesizers that allow transmition and reception at several different frequencies or
channels.
3. A FM headphone and FM transmitter according to claims 1 and 2 with band pass filters
before the outputs to filter out noise.

Description

CA 02209036 1997-07-17


Title: Wireless headphones with portable FM transmitter
abstract:
Wireless headphones that allows the user to listen to a signal transmitted from a low
power consumption portable FM transmitter that can be plugged into conventional
portable(or in full size) receiver/amplifier or cassette, Compact Disc player. This elimin:~tçs
the use of interconnecting wires. Both headphones and transmitter may be tuned to a certain
number of different frequencies to allow multiple users in the same area.
Specification:
This invention relates generally to the field of accessories for audio devices and to the field
of cordless audio devices.
If one wished to listen to audio from a audio source without inconveniencing others then
that person would use headphones or earphones and interconnecting wires, or just recently
wireless infra-red headphones (Patent application number 2012487).
Headphones with cable are cumbersome because they limit the range of the user and the
cord becomes a hazard. Wireless infra-red headphones solve the problem but the
transmitter is big and is not portable, and infra-red does travel through the Hunan body
making the position of the transmitter very important.
I have found that wireless headphones with a low-power portable FM transmitter would
solve theses problems. The feature that allows the headphones and transmitter to be set at
different frequencies would allow multiple users in a small area.
The low-power wireless headphone in composed of two main parts: The headset (Figure 1)
and the low-power consumption portable transmitter (Figure 2).
The headset (1) is comprised of two pads and two speakers. The headset has threecontrols: a volume control switch (6), an on/off switch (7) and a frequency/channel
control(15). The batteries(3) powering the headset are housed in (4) mounted on said
headset. The headset also includes an whip-type antenna (5).
The second part of the system is a low-power consumption portable transmitter
(Figure 2). This transmitter has a phono plug (mono or stereo depending on the choose of
the maker) that plugs into the headphone jack of a conventional receiver/amplifier, cassette
or Compact Disc player. An antenna transmits the audio signal. It could be a wire antenna
(11) or a whip-type antenna(10). The power is provided by the use of batteries (9).
From Figure 3, you can see the output from the conventional receiver/amplifier,
cassette and Compact Disc player is passed through a low-power FM transmitter that
modulates the signal to a desired frequency that can be set by the user from a pre-
determined selection, by turning the channel nob ( 15). The signal is then transmitted
through an antenna.
The signal is then received by the antenna on the headphones (Figure 4). Then
passed through a FM receiver that must be tuned to the same frequency as the transmitter.
Then the demodulated output is passed through an amplifier and then sent to the speakers.

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