WO1993026134A1 - Dispositif de reproduction sonore stereophonique utilisant une pluralite de haut-parleurs dans chaque canal - Google Patents
Dispositif de reproduction sonore stereophonique utilisant une pluralite de haut-parleurs dans chaque canal Download PDFInfo
- Publication number
- WO1993026134A1 WO1993026134A1 PCT/FR1993/000558 FR9300558W WO9326134A1 WO 1993026134 A1 WO1993026134 A1 WO 1993026134A1 FR 9300558 W FR9300558 W FR 9300558W WO 9326134 A1 WO9326134 A1 WO 9326134A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- signal
- speakers
- loudspeakers
- reproduction device
- sound reproduction
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04S—STEREOPHONIC SYSTEMS
- H04S3/00—Systems employing more than two channels, e.g. quadraphonic
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
- H04R1/40—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers
- H04R1/403—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers loud-speakers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
- H04R3/12—Circuits for transducers, loudspeakers or microphones for distributing signals to two or more loudspeakers
Definitions
- the present invention relates to a sound reproduction device by ultiamplification.
- the technical sector of the invention is the field of manufacturing high fidelity equipment for the reproduction of any sound signal.
- One of the main applications of the invention is the generation of three-dimensional sounds restoring the concept of bottom and top of the sound message.
- acoustic reproduction devices which always include a stage for amplifying a signal from any source of emission, such as a microphone, a magnetic tape, a disc, etc., and a or several speakers comprising one or more speakers transforming the output signals of the amplifier into membrane vibrations, creating variations in sound pressure waves.
- each of said output channels in the same acoustic enclosure, • several speakers, each adapted to an optimal range of waves ⁇ T, and often narrow, the together being complementary to cover the entire audible range: in general, at least one speaker of low frequencies, for the bass, one of high frequencies for the treble and another of medium frequencies for the midrange.
- each speaker thus receives a global signal which each speaker reproduces with good efficiency in its range of optimal waves: but if we want to modify the reproduction by amplifying or decreasing the power emitted, each high -Speaker then reacts to this correction differently, we must at the same time correct the frequency ranges relative to each other; we then act on filtering systems which in fact modify the entire signal, thus creating distortions and phase shifts which destroy the quality of the original sound (FLETCHER type equalization curves).
- the loudspeakers are provided with conical horns, of regular or exponential shape for a better directive effect, surrounding the vibrating membrane to concentrate the power of emission towards the front of it this; but there is always a lateral diffusion gradient and the decrease in sound volume is always very important with the distance.
- This directivity also limits the listening volume and can cause echo phenomena by reflection of the waves against the walls of the rooms; moreover, in the event of use of microphone, according to the position of this one, one causes an effect of amplified resonance between this microphone and the loudspeakers, known as effect "LARSEN", very unpleasant and annoying.
- each power is adjusted emission of each loudspeaker in order to smooth the power coefficient as best as possible by using a weighting for fixed and constant coefficients of "BESSEL”, by series or parallel combination of the coils of the loudspeakers; moreover, it is indicated that in order to obtain the desired effect at the closest possible distance from the loudspeakers themselves, it is recommended to clamp the baffles, without any intermediate vacuum.
- the problem is therefore on the one hand, to allow listening to the sound reproduction at a sufficient level in a large volume of hearing without offset of stereophonic effect, and without requiring too high amplification, giving with the same adjustment a good level of listening over this entire listening volume, and on the other hand ensuring said reproduction over the whole frequency range of the original sound, while preserving its relief, its tone, and its spatial effect, without phase shift, no distortion or background noise.
- a sound reproduction device comprising a means of stereophonic amplification, starting from two so-called left and right signals coming from any source of stereophonic emission, and various loudspeakers arranged in two groups, one to the left and the other to the right of the listening direction and each receiving the amplified left and right signal respectively; all of said loudspeakers are in even number, at least equal to four, and their emission faces are placed on a surface with continuous curvature: located two by two along vertical or substantially vertical axes, the respective distances both height and width between said speakers are determined according to the size of these speakers and those of the listening volume, and each speaker is associated with its own amplifier which sends the whole signal to this speaker received, said signal being previously divided into as many channels as said speakers by a distributor.
- the device according to the invention comprises a modulator which, after integration of the signal, either from each channel, or preferably global, received from the transmission source, on the one hand, distributes this on each channel output of the distributor according to preset thresholds to open one or more of said outputs and on the other hand, modulates the amplification of each of the signals sent to them according to this global signal without phase shift and without processing of the frequency signal, ie respecting the phase and the frequencies of the overall transmission signal.
- said sound reproduction device in order to reinforce the plane propagation effect of the waves as explained below, comprises eight loudspeakers arranged in two groups of four, ie four to left and four on the right, each forming a quadrupole, placed symmetrically with respect to a median plane.
- said speakers are all identical and are chosen such that their response frequency range is between approximately 100 hertz and 10 ⁇ hertz.
- These loudspeakers are for example of a medium type with a diameter of the order of 13 cm.
- the quadrupole system makes it possible to distribute the sound pressure waves in a uniform manner according to a plane gradient parallel to the surface of continuous curvature, defined by the arrangement of the emission faces of the loudspeakers: in a normal system, there is a spherical and therefore transverse pressure gradient in all directions, which dilutes the pressure wave in the three axis directions. In the quadrupole system, the gradient decreases only in the direction perpendicular to the emission surface.
- the decrease in power is only inversely proportional to this distance instead of being inversely proportional to the square of it.
- a transmission power of a few watts will then give at a given distance, the same result as a transmission power of several hundred watts with a sound reproduction device as existing to date, with high individual speakers or speakers grouping several speakers. If people listening to the reproduction move, the effect of the reduction in sound will be much less noticeable when moving away from the transmission surface, due to the slight decrease in power.
- This in addition to the much larger volume that can therefore be covered by ensuring good sound listening, also avoids significant distortion that always causes too strong amplification of the signal with current equipment, as well as the effects of reasoning with microphones. possible, also called "LARSEN" effect.
- each speaker behaves as a single sound source: the optimal amplitude is only reached in the plane median perpendicular to the line joining said speakers, while in the quadrupole system according to the invention, there is an almost uniform amplitude in all the surfaces parallel to the emission surface carrying said four speakers or quadrupoles and this gives a optimal listening throughout the volume located opposite said transmission surface.
- the uniform equipression zone thus created by said emission surface reduces the resonance of the listening rooms, because all the air molecules in this room are excited in the same way, whereas in the case. a specific emission by the speakers or - * loudspeakers known to date, the reflected sound can be greater than the incident sound which is directional at a given location, and if we are near the direction of emission of the speakers and speakers, we have an echo effect and therefore loss of intelligibility.
- the directional sound is always greater than the sound reflected throughout the room due to the plane wave, which allows better listening and eliminates any disturbing echo phenomenon.
- each said loudspeaker operates in a better power range; its counter-electromotive force being also weaker affects the output of the amplifier less: there is less signal distortion and thus better efficiency.
- there is a race for power which is all the more realistic as the energy is lost precisely in this counterelectromotive force and produces distortion.
- the quadrupole gives an altitude effect, by having vertical bipolar loudspeakers in height whereas in a conventional system, the loudspeakers are in a single horizontal plane, generally at the height of the ears; even the speakers behave the same, since they are combined speakers of different frequency ranges behaving like point sources, and if therefore we are not opposite the axis of said speaker or said speaker, the quality of at least one of the frequency ranges is lost.
- the large volume of air set in motion also reduces the effects of obstacles, all the more that one is always in direct vision of a loudspeaker, and the sound plane wave effect allows it go around obstacles without being disturbed; even better treble directivity is obtained, ie above 4 to 5000 hertz, by a backscattering effect of the air molecules, even behind the "sound wall".
- the distribution, dynamic real-time channels on the quadrupole also allows • .a natural dynamic by strengthening physical effect, thanks to the transmission mode change described laughed and -after which, according to the device of the invention, to go from one emission of cylindrical waves to plane wave.
- the signal distributing modulator system according to the invention 5 uses active multi-amplification without phase shift and the loudspeakers receive all the frequencies: the treatment is only in energy and not in frequency; it is therefore not necessary to have multi-channel speakers and medium speakers are sufficient as defined below.
- Figure 1 is a schematic overview of the device according to the invention.
- Figure 2 is a wiring diagram of part of the device
- FIG. 1 represents said sound reproduction device according to the invention, comprising, in a known manner, a stereophonic amplification means 3 from signals 6 ⁇ and 62, called
- one of the important and essential characteristics is that all of said loudspeakers 4, 9 are in even number, at least equal to four and located two by two along vertical axes zz 'or substantially vertical, and all the emission faces of these said speakers 4, 9 are placed in a
- the device comprises eight loudspeakers arranged in two groups of four, including four on the left 9 and four on the right 4, each forming a quadrupole placed symmetrically with respect to a median plane xx '; by way of example and in one embodiment, the height "h” separating the loudspeakers from each quadrupole is equal to twice the distance "1" which separates them, and the distance "d” separating each quadrupole from l 'median axis xx' can be equal to "l" / 2.
- the surface of the continuous curve 5 is preferably a plane, but could in fact be any curved, convex or concave surface.
- the device according to the invention can comprise six loudspeakers, two of which are left side 9. two right side 4 receiving respectively the left signal 8 and the right signal 7 which corresponds to them and two centrals located at equal distance "d" from the two lateral groups and receiving both the left and right signals.
- Said loudspeakers both of the right group 4 and of the left group 9. are preferably all identical and are chosen such that their range of frequency of response is between approximately 100 hertz and 10 ⁇ hertz, or in fact loudspeakers. speakers whose emission face is a disc of the order of 13 cm in diameter.
- Such speakers which are then of the medium type, generally exist in current multi-channel speakers, but they are associated for the reproduction of bass and treble sounds, with specialized speakers because they themselves have weak response curves in these.
- a low frequency loudspeaker and a high frequency loudspeaker are thus added in order to complete and therefore to raise the ends of the emission curve of the midrange speaker by increasing and strengthening only the bass and treble with each of these speakers, respectively: but this requires filtering and the different impedances cause distortions and phase shifts.
- Such a combination is necessary due to the decrease in the sound in spherical waves, especially in the field of bass around each speaker, whereas in the case of the device according to the invention, a field of sound waves is obtained according to surfaces a continuous parallel curvatures, preferably flat; there is a real superposition of the emissions of all the speakers in combination not of frequencies but of given geometrical arrangement and therefore a maintenance without attenuation of the emission curve of each one and even raising of the edges of the overall emission curve especially in the bass ranges; for these the emission is indeed more spherical than in the medium where one finds more important directivities and than in the treble which is even more directive and where the effect of plane waves is less significant.
- Each speaker 4 ⁇ , 2, 43, 4 and 9 ⁇ , 9z, 9- ⁇ , 9l ⁇ and more if all of these quadrupoles are associated with other quadrupoles in order to constitute an even greater surface area for sound emission are each associated with an amplifier 10, forming part of said amplification means 3, and which addresses all the frequencies of the received signal to it, said signal being previously divided into as many channels 12 as said speakers by a distributor 2: in parallel with this said distributor 2, the device according to the invention may include a modulator 11, as described in FIG. 2 below. This FIG.
- the modulator 11 makes it possible, for each channel, left and right, integrating at least the signal 6 corresponding to said channel and coming from the emission source 1, by virtue of an integrator 14 disposed in parallel on each of these channels, ensuring decoupling and said integration.
- said modulator 11 comprises control preamplifiers 15 with filters, which distribute said integrated signal 16 on each output 12 of the channels of distributor 2 corresponding to loudspeakers of the same channel: this distribution is carried out according to preset thresholds to open a or more of said outputs 12, and modulate the amplification of each of the original signals 6 or 62 addressed to them according to the overall integrated level of this signal, respecting the phase and the frequencies thereof "_ • "> •
- said modulator integrates all of the left and right signals, by virtue of a link 13 between the channels 61 and 62 after the pre-amplifiers and integrators 14 of each of said channels: this overall signal thus integrated is then processed by the control pre-amplifiers with filters 15 which therefore open at given levels as a function of preset thresholds of the global signal as described above, when only part of the signal is used, either the entire right signal or the entire left signal: in this case, the amplification of each of the signals sent to each output 12 is modulated according to the global left and right signal.
- filters 15 which therefore open at given levels as a function of preset thresholds of the global signal as described above, when only part of the signal is used, either the entire right signal or the entire left signal: in this case, the amplification of each of the signals sent to each output 12 is modulated according to the global left and right signal.
- amplification stages 3 represented by the amplifiers 10 on each speaker channel 7 or 8 and controlled by the modulator 11, there there may be after these outputs 7, 8 and before the corresponding speakers 4, 9, another amplification stage which can be adjusted by any operator who would like to modulate the general amplification of the emission by any external and known means.
- the dynamic distribution of the channels in real time on each of the quadrupoles allows a natural dynamic reinforcement by physical effect, thanks to a change of emission mode, which allows to pass and send the power only on one, two or four loudspeakers of each quadrupole: we thus pass from the spherical wave to the cylindrical wave, then to the quasi-plane wave, with the same energy emitted at a given instant, and the passage from one mode to the other, is done according to a law of continuous recovery delimited by the thresholds of passage and control, and which are in particular adjusted so as to obtain a power per m 2 for each speaker approximately constant.
- this active multi-amplification system is done without phase shift between speakers and without processing the left and right frequency signals: the signal transmitted to each speaker is in fact always homothetic to itself, without alteration, the spectrum frequency emitted by each speaker is the same as that emitted by the corresponding channels 61, 62 of the channel coming from the emission of the source ⁇ .
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- Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- General Health & Medical Sciences (AREA)
- Stereophonic System (AREA)
- Circuit For Audible Band Transducer (AREA)
- Stereophonic Arrangements (AREA)
- Amplifiers (AREA)
- Static Random-Access Memory (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/360,722 US5717766A (en) | 1992-06-12 | 1993-06-11 | Stereophonic sound reproduction apparatus using a plurality of loudspeakers in each channel |
DE69309679T DE69309679T2 (de) | 1992-06-12 | 1993-06-11 | Stereophonische tonwiedergabevorrichtung mit mehreren lautsprechern fur jeden kanal |
JP6501187A JPH08502863A (ja) | 1992-06-12 | 1993-06-11 | 各チャンネル中の複数のラウドスピーカを使用したステレオ音響再生装置 |
EP93913114A EP0645070B1 (fr) | 1992-06-12 | 1993-06-11 | Dispositif de reproduction sonore stereophonique utilisant une pluralite de haut-parleurs dans chaque canal |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9207447A FR2692425B1 (fr) | 1992-06-12 | 1992-06-12 | Dispositif de reproduction sonore par multiamplification active. |
FR92/07447 | 1992-06-12 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1993026134A1 true WO1993026134A1 (fr) | 1993-12-23 |
Family
ID=9430913
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR1993/000558 WO1993026134A1 (fr) | 1992-06-12 | 1993-06-11 | Dispositif de reproduction sonore stereophonique utilisant une pluralite de haut-parleurs dans chaque canal |
Country Status (9)
Country | Link |
---|---|
US (1) | US5717766A (fr) |
EP (1) | EP0645070B1 (fr) |
JP (1) | JPH08502863A (fr) |
AT (1) | ATE151585T1 (fr) |
CA (1) | CA2137695A1 (fr) |
DE (1) | DE69309679T2 (fr) |
DK (1) | DK0645070T3 (fr) |
FR (1) | FR2692425B1 (fr) |
WO (1) | WO1993026134A1 (fr) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ATE376892T1 (de) * | 1999-09-29 | 2007-11-15 | 1 Ltd | Verfahren und vorrichtung zur ausrichtung von schall mit einer gruppe von emissionswandlern |
DE10017653A1 (de) * | 2000-04-08 | 2001-10-18 | Basf Coatings Ag | Pfropfmischpolymerisate auf Polyurethanbasis, ihre Herstellung und ihre Verwendung |
NL1016172C2 (nl) * | 2000-09-13 | 2002-03-15 | Johan Van Der Werff | Een stelsel van geluidstransducenten met regelbare richteigenschappen. |
US20020135534A1 (en) * | 2001-01-24 | 2002-09-26 | Elsten Thomas J. | Single telephonic line input operable stationary variable information exhibitor and audio pager |
US7024002B2 (en) * | 2004-01-26 | 2006-04-04 | Dickey Baron C | Method and apparatus for spatially enhancing the stereo image in sound reproduction and reinforcement systems |
US20060018491A1 (en) * | 2004-07-20 | 2006-01-26 | Stiles Enrique M | Single-sided Bessel array |
DE102005033239A1 (de) * | 2005-07-15 | 2007-01-25 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Vorrichtung und Verfahren zum Steuern einer Mehrzahl von Lautsprechern mittels einer graphischen Benutzerschnittstelle |
US7889950B2 (en) * | 2005-08-30 | 2011-02-15 | The Regents Of The University Of California, Santa Cruz | Kernel regression for image processing and reconstruction |
KR101297300B1 (ko) * | 2007-01-31 | 2013-08-16 | 삼성전자주식회사 | 스피커 어레이를 이용한 프론트 서라운드 재생 시스템 및그 신호 재생 방법 |
KR101547639B1 (ko) * | 2009-05-22 | 2015-08-27 | 삼성전자 주식회사 | 사운드 포커싱 장치 및 방법 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4105864A (en) * | 1975-07-17 | 1978-08-08 | Teledyne Industries, Inc. | Stereo and spaciousness reverberation system using random access memory and multiplex |
FR2441978A1 (fr) * | 1978-11-16 | 1980-06-13 | Mumbach Pierre | Dispositif de sonorisation amelioree pour grands espaces d'audition |
EP0034844A1 (fr) * | 1980-02-25 | 1981-09-02 | Koninklijke Philips Electronics N.V. | Colonne de haut-parleurs ou de microphones indépendant de la direction et de la fréquence ou de la surface de haut-parleurs ou de microphones |
US4472834A (en) * | 1980-10-16 | 1984-09-18 | Pioneer Electronic Corporation | Loudspeaker system |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4107461A (en) * | 1977-06-09 | 1978-08-15 | Bose Corporation | Environment for demonstrating a stereo loudspeaker system |
US4199657A (en) * | 1978-07-21 | 1980-04-22 | Harvey Lane | Planar sound reproducing speaker system |
NL8105371A (nl) * | 1981-11-27 | 1983-06-16 | Philips Nv | Inrichting voor het aansturen van een of meer omzeteenheden. |
US4598418A (en) * | 1985-02-05 | 1986-07-01 | Griffith Jr Eugene R | Sound system employing automatic proportional amplification |
US4683591A (en) * | 1985-04-29 | 1987-07-28 | Emhart Industries, Inc. | Proportional power demand audio amplifier control |
KR910007182B1 (ko) * | 1987-12-21 | 1991-09-19 | 마쯔시다덴기산교 가부시기가이샤 | 스크리인장치 |
US5004067A (en) * | 1988-06-30 | 1991-04-02 | Patronis Eugene T | Cinema sound system for unperforated screens |
JPH0541897A (ja) * | 1991-08-07 | 1993-02-19 | Pioneer Electron Corp | スピーカ装置およびその指向性制御方法 |
-
1992
- 1992-06-12 FR FR9207447A patent/FR2692425B1/fr not_active Expired - Fee Related
-
1993
- 1993-06-11 WO PCT/FR1993/000558 patent/WO1993026134A1/fr active IP Right Grant
- 1993-06-11 US US08/360,722 patent/US5717766A/en not_active Expired - Fee Related
- 1993-06-11 EP EP93913114A patent/EP0645070B1/fr not_active Expired - Lifetime
- 1993-06-11 JP JP6501187A patent/JPH08502863A/ja active Pending
- 1993-06-11 CA CA002137695A patent/CA2137695A1/fr not_active Abandoned
- 1993-06-11 AT AT93913114T patent/ATE151585T1/de not_active IP Right Cessation
- 1993-06-11 DE DE69309679T patent/DE69309679T2/de not_active Expired - Fee Related
- 1993-06-11 DK DK93913114.0T patent/DK0645070T3/da active
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4105864A (en) * | 1975-07-17 | 1978-08-08 | Teledyne Industries, Inc. | Stereo and spaciousness reverberation system using random access memory and multiplex |
FR2441978A1 (fr) * | 1978-11-16 | 1980-06-13 | Mumbach Pierre | Dispositif de sonorisation amelioree pour grands espaces d'audition |
EP0034844A1 (fr) * | 1980-02-25 | 1981-09-02 | Koninklijke Philips Electronics N.V. | Colonne de haut-parleurs ou de microphones indépendant de la direction et de la fréquence ou de la surface de haut-parleurs ou de microphones |
US4472834A (en) * | 1980-10-16 | 1984-09-18 | Pioneer Electronic Corporation | Loudspeaker system |
Non-Patent Citations (2)
Title |
---|
ELECTRONIC COMPONENTS AND APPLICATIONS vol. 5, no. 4, Septembre 1983, EINDHOVEN NL pages 200 - 206 W.J.W. KITZEN 'Multiple loudspeaker array using Bessel coefficients' * |
JOURNAL OF THE AUDIO ENGINEERING SOCIETY. vol. 38, no. 4, Avril 1990, NEW YORK US pages 204 - 220 M. R. GANDER AND J.M. EARGLE 'Measurement and Estimation of Large Loudspeaker Array Performance' * |
Also Published As
Publication number | Publication date |
---|---|
DK0645070T3 (da) | 1997-10-27 |
JPH08502863A (ja) | 1996-03-26 |
FR2692425B1 (fr) | 1997-04-25 |
FR2692425A1 (fr) | 1993-12-17 |
EP0645070B1 (fr) | 1997-04-09 |
EP0645070A1 (fr) | 1995-03-29 |
ATE151585T1 (de) | 1997-04-15 |
DE69309679D1 (de) | 1997-05-15 |
CA2137695A1 (fr) | 1993-12-23 |
US5717766A (en) | 1998-02-10 |
DE69309679T2 (de) | 1997-10-23 |
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