ACOUSTIC BOX FOR SOUND TRANSDUCTION

ENCEINTE ACOUSTIQUE POUR LA CONVERSION DES SONS

English Abstract

ABSTRACT OF THE DISCLOSURE
An acoustic speaker enclosure including two sound areas
separated by a wall to provide medium or medium high and high
units. A first area is divided into two chambers approximately
equal in size by a sound screen. A speaker or transducer is
mounted in a rear chamber and a suitable horn is mounted in a
front chamber independant of the rear speaker in such a way that
the part of the chamber between the screen and the horn
constitutes a pneumatic stabilizer of the membrane of the speaker
in the rear chamber and balancing the compression to improve
response at low or sub low frequencies. The chamber defined by
the horn constitutes an acoustic transformer to increase response
in the low frequency range. In the other sound area a biconical
horn is mounted with a front part at the entrance of the sound
area. The biconical speaker includes a sealed bell at its inner
end for phase correction.

Claims

C L A I M S
1. An acoustic box for sound transduction, including two sound areas 1 and 2 separated by the
correspondent wall 3, forming the are 1 the correspondent low unit, while the are 2 constitutes
the medium-high unit or medium and high unit, and incorporing in both areas the respective
transductor to convert the correspondent signals into sound, essentially it is characterized because
the are 1 is diveded into two chambers 4 and 5, aproximately equal, by means of a sounder
screen 6, where it is assambled to correspondent transducer 7, being be foreseen that in the rear
chamber 5 the assambly of a horn 9 duly adjusted, which it is independent of the tranducer 7, in
such a way that the part of the chamber placed between the screen 6 and the surface 9, constitutes
a pneumatic stabilizer of the membrane of the transducer 7, balancing the rear compression
weight 8, and giving a better raised work in the extreme of low or sub-low, while the chamber
determined by the horn constitutes an acoustic transformer that increases the capacity in the low
ones in alignation in respect to the final response; with the characteristic that the area 2 that
constitutes the unit of medium-high or medium and high incorpores a biconical horn formed by
two parts 13 and 14 joined by its smaller bases in such a way that the front part of the horn 14 is
frontly extended in a seized way 15, through which it is assambled on the entrance of the
correspondent area 2, while the part 13 is extended in a wing 16 which contitutes a fixing mean
of a biconical diffuser 18, of the transducer 17 and of a sealed bell 19, all this in such a way that
the biconical diffuser 18 acts as a corrector of the phases and as a mean to distribute the potential
in a vertical way.
2. An acoustic box for sound transduction according to claim 1, characterized because the internal
mouth 10 of the horn 9 correspondent to the first area 1 has a diameter equal or smaller to the
mouth correspondent to the membrane of the transducer 7, and this last one is equal or smaller
to the external mouth 11 pertening to the mentioned horn 9.
3. An acoustic box for sound transduction, according to claim 1, characterized because the
biconical diffuser 18 of the second area presents its bigger joining bases separated by a central
chain from which derives branches to vinculate the complex to the correspondent wing 16 of the
internal part 13 correspondent to the biconical horn, being forseen that the chamber 20, that
forms the sealed bell 17, determines the mean to content the rear weight of the transducer 17,
forming also a syntonized area, while the frontal weight of the mentioned transducer 17 keeps
distributed in benefit of directivity.

Description

2002034
ACOIJSTIC l~OX FOl~ SOUNV 'l'l~ANSI)UCTlON ~"" ~``; `
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I)ESCI~II''I`lON
PURrOSE OF TIIE INVENTI()N
This invention is rererred lo an ncour?lic coml~lcx ror sou~ rnlls(luclioll, a box wllere lwo ` ;
independent areas arc adjus~e(l, onc of lllem ns a low solll)(l ul~ mcnlls, ror low rreguencies, ;~
and the oiher one for medium-hi~ll rre~u~llcics or mc(lilllll nl~ rrcgucllci~, imn~al1s~ wilh , i
the characterislic that in lhe rirsl casc lhe nte.l is d~vi(lcd intO l~o l-nr~s or chnlllbers sel~araled
by a sounder screen where il is adjuslcll lllc lrnl-s(lllccl, I cin~ Ihis one l-laccd in one of the
chambers, while the olher one incorl~ores? Ihc nsscml71y Or a hobbill. ~ he SCCOlld casc, i~ means,
the medium-high unil or medium and hi~ll il incorl)orcs n biC(!lliCnl bOhl-ill WlliC~ iS comple~ed~
with a dirfuser and a sealed bell ~hal works ns challll-cr Or lhc lrans(l-lccr, I eing a(ljusle(l inside
of it.
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BACKGROUN~OFTIIEINVENl'lON ``"` `~ ~ n``
Sound transduclion is lhe rhlal slngc Or lhc cllnill Or l hellolllellolls Ihnl slarls whell an analo~ or
digital activ~ted magnelic tape, a disc rccor(lG(I hllo ~roo~cs, or an ol)lically recorded base, is ` - ` ; ``~`
exploted by ils corresponded rea(ler, hl such a wny lhal lhc rcadcr cmils clcclricnlly inlerprelcd
signals to be later filtraled, lrealed and aml)li[icd~ l y me.llls Or lhc corr~spolldell~ ~ransducer, in
order to be converled inlo a new sound.
Electroacouslic tranducers or sl)enkcls, arc bnscd on a mol-il l-ol-l-in associnlcd ~o ~he corr~s- `; ~ ``
pondent magnet and lo a membrnlle or cone, all assambled on n slll)l~or~ s~ruc~ure.
The menlioned mobil bobbin rcceiYcs ~hc clcclricnl sound si~nill, ~cncrn~illg a variable magnelic
rleld that produces repulsions in resl~ccl lo lhc rickl gcncrnlcd hy lllc lixc(l magllet, alld sinse ~his `"
one is joinled lo lhe frame, while lhc bol l-in is jointcd lo Ihe mcllll)ralle or cone~ and also this
cone is fixed to tlle rrame, il resulls Ihnl Ihc sllir~s Or ~hc mellliOIlCd bobbill .lrc ~rallsla~ed in~o
molions of the membrane or cOIlc"lll(l consecuclllly il Ls r)rodllce(l Ihe corresl)ondcll~ sound
when the air masses are shined. ,~
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In olher nspects, i~ mus~ be laken in accoulll llult ~l~c mosl impol lanl (lualily ora soull(l lransdllcer
is ~hal it must produce a sound ll~c mosl silllilal pnssiblc soun(l ~o Ille onc gcncralcd in ll~e source,
and consecuenlly reproducin~ is SOlm(l Will~OIII inlr(!(lllcin~ any dislol lion raclor.
In this way, it has been demonslralc(l llull willl a sole spcakcr il is inll-ossil-lc lo cover all lhe
range of audible frecuencie~s, and consccllcnlly il mllsl l-c resorlc(l lo I-i~ dialllclcr speakers ror
lhe low rrequencies, known as woorers~ wl~ilc lor l~igl~cr rrcqucncicS il is cmployc(l spcakers Or
smaller dismeler, known as Iweelcrs
Also it must be taken in accounl ~hal a spcakct emils SoUn(lS inlo Iwo OppO~Cit direCIiallS, OllC Or
them considered as rear and ~hc olher onc as lronlal, I-cin~ l)roduce(l in l-elwcen ll~e air volumes
contained belween the ~wo parls sollle mixl~lrcs Ihal inlcrrers Illc vil-ralions
There is no doubt ~hat solulion lo avoid lhis ploblclll woul(l COllSi~CI in S(`parale bolh parls by a
sounder screen, in such a way lhal each onc Or lhc ~encralc(l w avcc woul(l ~o lo dirrerenl sidcs Or
it. This screen, denominaled inRnile screen~ is iml~ossil-le lo I e carric(l oul in Ille praclice, and
consecuen~ly i~ is resoned ~o ~lle classic acouslic box whcrc il is lricd lo climillalc lllc rear wave
Onc o~ ~he charac~eris~ics of ~he acouslic l)0X is Ihe one rclalcd 10 IhC air conlailled inside Or il,
because, since it is sealed, ~he movcmenl Or lllc correspolldclll spcaker mellll rane produces a
compression of the internal air, bcing lllis onc nc~ ,il lc ir it is cn~ wl~ilc ill tlle contrary
case, the mentioned compression Or ~he air will arlecl llle me~ rallc; il mcalls, il will always exist
a minimum box volume where al a lower levcl il will l)e nol ol-lainc(l a ~ood rcpro(luclio
Consecuently, it is evident thal one or lhe problcllls lo hc solved hl ll1C .ICOUSl;C l-oxes is ils size,
and another problem is ~he phases, in SIICIl a way lhal llle dirrcrcnt wavclcngllls will arrive
compensated to the lis~eners, pre~sen~ing a pllasc COlllbill.lliOIl very simil.lr lo Ihe original sound
wilh the highest possible direclivily.
These problems change according lo lhe acous~ic coml)lcx~ forlllcd by lwo or more lransducers,
each one alocaled in ils acoustic bo~, so ir i~ is .lsed oll~doors or illdools i~ will cllall~e accordillg
lo the place, depending on ~he acous~ic con(liliollill~ and il will incrc.lsc accor(lill~ ~o llle acouslic
power used it each case
When they are proffesional acouslic complexes ror places sucll as discollle(llles, audiloriums or
outdoors, it is undertood lhat lhe~se acouslic l-oxe~s musl havc a big size and wci~ht, somclhing
that complicates bolh lhe transpor~ and lhe assallll)ly.
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'20021~4 '.',
DESCRII'TION OF'I'IIE INVEN'I'ION
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The acoustic box for soun(l Irans(luclioll, cal ricd oul accol ~ling ~o ~llc objeclion or llle inventioll,
has been conceived lo solve thesc l~roblclns, orl`elillg sucll a slrllcllllc llull ror silllililr power it
presenls a 50% smaller v(~lume lluilll lllosc aclllally cxisilill~ in lhc malkct an(l a 2(~% lower
weight, and consecuently lhis iacouslic box~ ~Yilh il sinlilar sizc lo olllcr classical ones~ gives a
higher power, a more planc rcsp(!llsc iall(l ialso olrcrs a lowcr dislol~ioll iall(l il consnallt direc~vily,
and all lhis as a consccucncc or a bcllcl disll il~ulioll Or lllc sollll(l sl)ccll lllll as il is hcre explaine(l
In a more specirlc way, ~he acouslic l)ox conslilllcs a h(lllow l o~ly Ihal il is (IcYkle(l in~o ~wo areas
or unils, one of lhem denonlina~e(l lo~v unil an(l ~l~c olhcr onc (lcnolllill<lle(l mediulll-higll or
medium and high unit
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The low unit de~ermines an area dcvi(lc(l inlo lwo parls or cllalllbcn~, as a consecllellce ot an
intermediale sounder screen, incorl)ol ing ll~c r ear cl~ambcr a horll, wllicll ils inlerllal moulh is
equal or smaller to lhe one of Ihc mcllll)l anc corrcsl~oll(lclll lo Illc Irans(lllcer adjusled on the
referred sounder screen, trans(lllccr Illal il is l)lace(l insi(le lllc olhcr challlber By olher part, ~be ; ~ -
mouth of the rererred lransdllcer is also eqllal or smaller lo lhc cxlcrnal one of llle horn
This disposilion and physical slruclurc or lhe mellliolle(l coml)nllcllls allow~s a~pneumatic stabili-
zation of lhe lransducer meml ranc, balancillg the rear wci~hl an(l giving a beller raised work in ;~
lhe exlreme low or sub-low, conslillllillg also all acouslic lriallsrormcr ~l~al increases lhe capacily
in lhe low ones in alignemenl in respccl lo lllc final responsc
The pneurnalic slabilizer, consliluled by lhe p arl or lhc chaml)cr Ihal il is belween lhe sounder ~;
screen and lhe horn, allows the reduclion or llle lolal volumc of lhe arca willlolll producin~ any
acoustic short-circuil, il means, hllllohilizalion Or lhc lrans(lllccr mcllll)rallc
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Referred lo lhe medium-higll uniL or mcdium and lligb, lhis one inclll(les a horll, prererably
biconical, where lhe lwo parts Or Ws horn are joine(l hy ils smaller l ase
The parl of horn considered as lhe inlcrllal onc is cxlcn(lc(l l~crill~clrically in a wing which -~
conslitutes a support-mean for a biconicfll dilrllser iall(l ror a scialc(l I-cll lhal works as ia chamber
of lhe lransducer which il is adjusled on llle r ercrrcd Willg of tllC inlcrllal part o~ lhe horn
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This incorporated biconical ditfuser WOI ks as il l)hasc corrcclor an(l collaborales in the dislribulion '~
Or lhe polenlial in a verlical way ~ ~
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20020~4
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DESCR11'TION OF TIIE DRAWIN(l~
To complete this description and in or(ler lo hcll) lo a hcller un-lcl sntlll(lillg Or lhc characterislics
of lhe invenlion, it is joined lo lllis dcscriplivc l-rochul c~ as a wl1ole pal l, a sole slleel Or plalls,
where as an illustrative an(l non-liltlilalivc cllaractcr, il luls bccn rcl)resclllc(l a lransversal sccfion
of the acouslic box with the componcllls llmt rornls il.
PREFERRED REALIZAT10N OF 'I`IIE INVEN l`lON ~ ~:
As it can be seen in lhe figurc, it is observe(l how llle acousfic l-ox or llle invelllioll incltlde~s lwo
areas 1 and 2, tolally independcnt an(l scpal aled l!y all in lerllle(lia te wall 3, areas tl~al conslilules
the corrrespondent units Or low and medium-iligll or me(lillm an(l higll.
The area 1, or low unit, is devided inlO two challlbers 4 an(l 5, apro~imalely all(l prereral ly equal,
by means oE a sounder screen 6, being lllis OllC c(luippe(l wi~h Ille correspoll(lcll(l hollow lo adjust
the transducer 7, which ofrers a rcar coml)ressioll wci~hl showll hy llle arrows 8 in lhe chamber
4, while in the rear part il incorporcs a horll 9 ~lml coul(l be paral)olic~ conical~ e~pollelllial or
hyperbolic, that do not congeniate wi~ llc trans(lllccr 7, beill~ lllis one adjuslcu in lhe arca 1, as
it is shown in the rlgure.
The mentioned horn 9, presenls an in~crnal molllll t(), lhal musl bc c(lual or smallcr lo the
membrane moulh of the lranducer 7, while lhc m()ulllll or lhis lasl onc mu.sl l-c cqual Or smaller
to the external mouth 11 Or Ihe hom 9.
As a consecuence oE the adjusting of lhis horn 9, in lhc chaml-cr S il is also (Iclemlined two
sub-chambers, one of lhem in the horn 9 and Ihc screen 6 an(l ~l~e Onc rcrerred wilh 5' and lhat ` ~:
corresponds to the hole determh~ed by lhe l~orn 9, in such a way lllal lhc gcneral chamber 5 is
the addition of the menfione(l inlernal challll-el all(l Or lllc exlernal clualllbcr or rercrcnce 12 Or
the horn.
The horn determined between this horll 9 an(i lhe soun(ler screen 6 conslilu~es a pneumafic
stabilizer of the transducer membralle 7, balancillg ~he rear wcigllt 8 an(l incorporing a better
shape in the extreme low or sub-low, while llle parl Or lhe challlbcr 5` or llle correspondel1t lo
lhe horn 9 constituîes an acouslic transrormcl lhal elcvalcs lhe capacily in lhe low ones~ in
alignament in respect to the final response.
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200Z034 ~ ~ ~
In this way, the berore mcllliollcd l~ncllllla~ic slnl~ilizer allnws ~llc r e(luclioll oï ~ olal volumc
of the area, wilhout produchl6 acouslic shol l-cil cuil~ il mcalls, inlllol-ilizalioll Or the mcmbrane
of the lransducer 7. ` "
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In relnlion wilh ~he arca 2 or mc(liulll~ ll Or mc(li~ an(l hi~ll tlllil, illSidC Or il, i~ is de~ermille(l ~ `
n chamber I2, and in il, il is a(ljtlslc(l fl hiCOlliC.ll h01 n COll~CIinllc(l hy lWO parls 13 alld 14, johle(i `- `
by its smaller bases, wilh lhe char.lclel islic lhnl lhc pal l of Illc hol n 1~ is Illc Onc Ihat it is adjuste(l ` "`
to lhe mounlh of the arca 2"all(1 lo do il, Ihis pnrl 14 of Illc h(-lll, lucscllls ils rear l~or(ler ~ ` `
bordered according lo lhe refcrcllce 15, showll in Ihc refcrrc(l fi~urc~ .
The inletnal part oE lhe horn 13, is cxlell(lcd hl R Will~ lf~, cnnslilulillg a scal ror lhe transducer
17 and a support ror the bicollical dirrtlser 18, scparalillg Ihe hi~er p3rl of il l y a central chailI `
lhat by means oE lhe cmergillg an(l radial hlallclles is joillcd lo Ihc win~ Ifi, also supporling a `
sealed bell I9 lhat works as a challlhcr of Ihc ~rialls(ltlccr 17.
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According to this structure, the bicollical dirrtlscr 18 works as pllasc correclor all(l joinly wi~h part
of the area 13, dislributes lhe polenlial hl a verlicall way in Ihe narrowlless Ihal rorms the biconical
13-14 o~ this horn. This diffuscr Ig mtlsl he as ncar as pc)ssil)lc lo ~hc p islon of lhe lransducer 17
without obstructing the maximum movcmclll of il. ` -
The rear weight of lhe menlioned Iralls(ltlccr l7 kccps conlahlcd hl Ihe challIl)er 20 formed by
the sealed bell I9, consliluling a synlollizc(l arca, while lhe frolll wei~h~ keeps distribllled in
benefil oE direclivily and of lhc major prcscllcc hl rcsl)ecl lo thc ~olal spectrllm by llle diffuser ` `
and its horn. ; `
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In a maximum reduclion of the chnllll)cr 4 corrcspoll(lell~ lo lhc Rrsl unil or area 1, in respecl lo
the addition oE the olher lwo cllaml)crs or this arca 1, il is rorsecn hollows or whIdows hI lhe same `
inlermediale wall 3 that separalcs l)olh arcas or ullils.
Il is nol considered as necessary lo do a lon~er dcscril)lioll hl ordcr lo hc un(lersloo(l by a perso
skilled in this area and lo underslan(l Ihc advalllages of il.
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'rhe malerials, shape, size and disposilioll Or llle elcmellls COtlkl I)C varic(l, if il me.llls no suslanlive
alleration oE lhe invenlion.
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The terms used in the descriplinn of lhis brocllulc musl he lakcll hl lhe ~idcst possihleway and `~` `
in a non limilalive way.
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Representative Drawing