EP0025118A1 - Dispositif pour la reproduction acoustique de signaux qui sont représentables au moyen de canaux stéréophoniques de droite et de gauche - Google Patents

Dispositif pour la reproduction acoustique de signaux qui sont représentables au moyen de canaux stéréophoniques de droite et de gauche Download PDF

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Publication number
EP0025118A1
EP0025118A1 EP80104595A EP80104595A EP0025118A1 EP 0025118 A1 EP0025118 A1 EP 0025118A1 EP 80104595 A EP80104595 A EP 80104595A EP 80104595 A EP80104595 A EP 80104595A EP 0025118 A1 EP0025118 A1 EP 0025118A1
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EP
European Patent Office
Prior art keywords
arrangement according
signals
speakers
delay
loudspeaker
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
EP80104595A
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German (de)
English (en)
Inventor
Rainer Dr. Ing. Riedlinger
Walter Dr. Ing. Koch
Peter Schneider
Peter Hartwein
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
RIEDLINGER, RAINER, DR.-ING.
Original Assignee
Riedlinger Rainer Dr-Ing
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE19797923615 external-priority patent/DE7923615U1/de
Priority claimed from DE19792933842 external-priority patent/DE2933842A1/de
Priority claimed from DE19792934000 external-priority patent/DE2934000A1/de
Application filed by Riedlinger Rainer Dr-Ing filed Critical Riedlinger Rainer Dr-Ing
Publication of EP0025118A1 publication Critical patent/EP0025118A1/fr
Ceased legal-status Critical Current

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    • 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
    • H04R1/02—Casings; Cabinets ; Supports therefor; Mountings therein
    • H04R1/026—Supports for loudspeaker casings
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R5/00—Stereophonic arrangements
    • H04R5/02—Spatial or constructional arrangements of loudspeakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
    • H04R2201/02—Details casings, cabinets or mounting therein for transducers covered by H04R1/02 but not provided for in any of its subgroups
    • H04R2201/021—Transducers or their casings adapted for mounting in or to a wall or ceiling

Definitions

  • the invention relates to an arrangement for acoustic reproduction of signals which can be represented by means of a right and a left stereo channel, this arrangement containing a plurality of individual speakers, at least some of which are connected to the right and left stereo channels via delay devices.
  • stereophony has therefore been proposed, in which two or more channels, ie transmission paths, are used.
  • Two-channel stereophony has become established for radio, record and tape playback, while up to five channels are used in sound film.
  • a disadvantage of the two-channel stereo is that the listener must be on the line of symmetry of the loudspeaker arrangement , that is, in the middle between the two loudspeakers or in their vicinity in order to obtain a spatial sound impression.
  • the listener is to the right or left of the center of the two Speakers, a perfect stereophonic impression is only created when the distance between the listener and the loudspeakers is very large.
  • the well-known stereo transmission with two loudspeakers enables "directional listening" only in a very narrow area around the center plane of the stereo base. If both loudspeakers receive the same signal at the same level, only the listener who is within this narrow range locates the virtual sound source exactly in the direction perpendicular to the base. However, if the listening position is outside of this range, the listener hears the virtual sound source from a direction that is turned towards the closer speaker. This is based on two mutually supportive causes. On the one hand, the sound level that comes from the closer speaker is higher than that from the more distant speaker, and on the other hand, the wavefront of the closer speaker reaches the listener first. As a result, the listener, as described by the law of the first wavefront, increasingly localizes in the direction of the loudspeaker mentioned.
  • a loudspeaker arrangement with directivity which has a multiplicity of individual loudspeakers p which are connected to phase-rotating elements, so that the direction of the main radiation can be inclined with respect to the direction perpendicular to the radiating surface (DE-PS 844 169). If this arrangement is used for the reproduction of two-channel stereo broadcasts, two loudspeaker chains must be provided. This also applies to other known loudspeaker arrangements which work with several loudspeakers and delay lines (DE-AS 10 81 051, 'column 4, line 34 ff).
  • a sound reproduction system which has a plurality of individual speakers which are connected to the two stereo channels via delay devices (US Pat. No. 4,105,864).
  • the stereo channels are first placed on a mixer and then individually delayed as a uniform signal for certain speakers.
  • the loudspeakers are supplied with mono signals which are delayed differently but are otherwise the same. Sloping wave fronts cannot form.
  • the invention has for its object to provide an arrangement for the acoustic reproduction of two-channel stereo signals, with which the stereo effect can be clearly perceived at different locations in a listening room and which can be set up with discrete individual speakers.
  • This object is achieved in that the left stereo signal is fed to a single speaker with a first delay assigned to this speaker and that the right stereo signal is fed to a single speaker with a second delay assigned to this speaker, the delays of the right and left stereo signals being so dimensioned are that the waves emitted by the individual speakers form two wave fronts.
  • the advantage achieved with the invention is, in particular, that very good localization of the sound is possible from any location, ie also outside the stereo center. Hall signals or the like, in contrast to the subject of US Pat. No. 4,105,864, where delay times of ⁇ » occur through the invention not generated, so that the sound reproduction is extremely lifelike.
  • the invention goes u. a. from the consideration that the unsatisfactory results in previous efforts to improve stereophonic reproduction of sound signals are essentially due to the fact that the known systems do not allow a free, independent selection of the parameters delay (track wave speed), level curve and frequency response.
  • the dimensioning of the previously known systems leads to a strong dependency of these parameters on one another.
  • the use of radiator plates is limited, for example, by the fact that dispersion can be observed at very low frequencies due to the occurrence of bending waves, which leads to a frequency-dependent direction of the radiation.
  • the playback system according to the invention is free from these disadvantages. It has no unwanted dispersion.
  • the beam angle can be kept constant as required.
  • the amplitudes of the signals in the direction of propagation can drop as required, or can be set to increase. Frequency-dependent changes in the amplitude of the signals can be avoided or adjusted according to requirements, for example to compensate for the bundling of loudspeaker groups, which becomes sharper with increasing frequency.
  • Fig.l an arrangement of several individual speakers 1-9 is shown, each of which is assigned a power amplifier 10-18, which serves as a summation amplifier.
  • Each of these power amplifiers 10-18 is connected to the outputs of two preamplifiers 19-27 and 28-36.
  • a series of delay devices 37-45 and 46-54 is connected in series with these preamplifiers 19-27 and 28-36, the delay of which can be set.
  • the delay devices 37-45 are located on the rail 55, into which the LF signals of the left stereo channel are fed, while the delay devices 46-54 are connected to the rail 56, into which the LF signals of the right stereo channel are fed.
  • the sound wave front 57 that can be seen in FIG. 1 is only shown for the left channel. It can be seen here that only the loudspeaker 1 transmits its sound wave 58 at time t, while the other loudspeakers due to the delays of the LF signal does not yet emit a sound signal.
  • sound wave 58 of loudspeaker 1 has advanced, and sound wave 59 of second loudspeaker 2 is emitted, sound wave 59 at time t 2 being shifted from sound wave 58 at time t 1 by time t 2 -t l .
  • This time t 2 -t 1 ⁇ can be set with the aid of the delay device 38.
  • the loudspeakers 3-9 receive the signal of the sound wave 58, offset with respect to the preceding loudspeaker by the time ⁇ , the result is an oblique sound wave front, as shown in FIG.
  • This wavefront corresponds to the envelope according to the Huygenian superposition principle.
  • the intensity of this envelope decreases 1 / r, where r is the distance of the wavefront from the loudspeaker. In the area in front of the loudspeaker 1, however, only this acts. This results approximately in a spherical sound wave, the intensity of which decreases with 1 / r 2 .
  • the delay electronics 37-45 determine the distance between the wave fronts 58 at the different times t 1 , t 2 , t 3 . It can be seen that the inclination of the wavefront line 57 depends on the time delays. The smaller the time delays, the flatter the slope of the wavefront. In the extreme case, ie when there is no longer a time delay, the wavefront is emitted perpendicular to the axis passing through the loudspeakers 1-9.
  • Each of the loudspeakers 1-9 is thus also supplied with the sound signals of the two stereo channels via delay electronics, each via an adding and power amplifier. Each of these speakers 1-9 thus serves to emit both channels simultaneously.
  • the delay electronics achieve a different directivity of the sound radiation despite the radiation from the same loudspeaker chain.
  • the parameters should preferably be selected so that there is an opposite symmetry of the two directional characteristics associated with each channel.
  • FIG. 2 shows an arrangement in which both the wavefront of the left and the right stereo channel are shown.
  • the figure also schematically shows a hi-fi tower, which consists of a turntable 67, a tuner 68, a cassette player 69, an amplifier 70 and a device 71 for "holophony" - as the type of spatial reproduction of the acoustic signals according to the invention is called - consists.
  • the L / R signals of the electrical stereo formation are fed from the amplifier 70 to the device 71.
  • the signal is then separated in this device, namely into a lower and an upper frequency range.
  • the lower frequency range - approx. Up to 300 Hz - is fed via lines 72, 73 to normal stereo speakers 74, 75 with good low-frequency reproduction.
  • the higher frequency range of the signal is fed to the speakers 1-9 via a multi-core cable 76 which is looped through the speakers 1-9.
  • This cable 76 is connected to the first loudspeaker 1 and then continued to the last loudspeaker by means of cyclical swapping. In this way, each of the loudspeakers 1-9 receives the signal intended for them from the multi-core cable 76.
  • the wave fronts 77, 78 of the left and right channels now overlap in the manner shown in FIG.
  • the shorter duration of the signal along the speaker chain makes the differences in the delay and the volume reduced between the two channels so that the spatial sound impression is preserved on every seat within this triangle.
  • the shorter running time of the near channel is a higher volume, the distant channel compensated.
  • the spherical front of the near channel drops in intensity with 1 / r 2 , while that of the distant channel only drops with 1 / r. If stereo signals are added to the chain of loudspeakers 1-9 and the time delays are omitted, a mono signal is generated due to the localization of the sense of hearing.
  • the large number of speakers does not improve the poor sound of the speakers, but rather the direction of the sound.
  • a further improvement in the spatial sound impression can be achieved - as hearing tests have clearly shown - if the time delays are set in such a way that wave fronts 80, 81 result, as shown in FIG.
  • the angle ⁇ 1 can be 14.5 ° and the angle ⁇ 2 30 °. This requires a variable time delay, as will be explained further below.
  • each channel contains an independently adjustable time delay for each loudspeaker.
  • twenty delays are necessary.
  • four delay devices or ICs are then necessary.
  • the electronic delay of the LF signal is carried out with bucket chain ICs that have fixed taps (e.g. Reticon R 5201-1 and R 5201-2).
  • the loudspeakers that are connected to an IC have a constant runtime difference, while the ICs can have different runtimes. If all the running times are constant, the loudspeakers, which are assumed to be a point source of sound, emit a directed wavefront, the Er angle depends on the time delay in the speaker chain.
  • the wave fronts shown in FIGS. 1 and 2 then result. If two delay ICs with five taps each are used per channel, two different transit times can be produced, which cause a kink in the wavefront, as shown in FIG.
  • Such a bend can only be achieved with electronic means if one works for both channels, ie. for the right and left stereo channels, only one loudspeaker chain is used, which emit both channels together. Aligning the loudspeakers or varying the distances between them would influence both channels and would therefore not allow the wavefronts to run against each other.
  • any bending of the wave fronts 82, 83 is possible.
  • the wave fronts then preferably consist of hyperbolas, as shown in FIG. 4, so that the sound is kissed at a distant focal point (per channel).
  • the levels of the left channel decrease from left to right, whereby, for example, 0.5 dB can be set between the speakers. The same happens with the right channel, except that the levels decrease from right to left.
  • each loudspeaker 110, 111-118 is assigned a time-of-flight controller 130, 131-137 for the right channel 122, and a time-of-flight controller 140-147 for the left channel 123.
  • the loudspeaker 110 arranged on the left of the row in the figure does not have a delay time control for the left channel, likewise the loudspeaker 118 located in the row on the right does not have a delay time control for the right channel 122.
  • each speaker has one for the left channel Frequency response controller 150 and an amplitude controller 151 assigned.
  • a summation amplifier 124, a level controller 125 and a power amplifier 126 are provided for each loudspeaker.
  • the system illustrated in Figure 3 is also still equipped with side speakers 110 ', 111' of no further interest here, to which a summing amplifier, a level controller and a power amplifier are also assigned.
  • the embodiment according to FIG. 6 differs from the embodiment according to FIG. 5 in particular in that the delay adjusters 230, 231 ... 237 or 240, 241 ... 247 assigned to the individual loudspeakers 210, 211 ... 218 are not parallel to each other, but are connected in series. Otherwise, this embodiment does not differ from the embodiment according to FIG. 5, and the same reference numerals are introduced for the same parts as in FIG. 5, but increased by one hundred to distinguish them.
  • the delay times of the sound signals can thus be individually adjusted between the loudspeakers, namely in such a way that the sound signal is delayed either from the sound signal source according to the position of the individual loudspeaker along the chain (embodiment according to FIG .5), or in such a way that the delayed sound signals are passed on from speaker to speaker and are further delayed (embodiment according to FIG. 6).
  • a combination of these two basic possibilities can of course also be realized.
  • the level of the signal components can be set individually per channel and loudspeaker, which was fixed in the simplified embodiment of the invention according to FIG.
  • the directional characteristic can be set differently using known electronic means for different frequency ranges of the audio signal, which is likewise fixed in the simplified embodiment according to FIG.
  • Such a loudspeaker chain arrangement with the associated electronic part which includes the individual setting of the signal level, frequency response and delay of the tone signal for each loudspeaker, and the joint emission of both channels of a stereo signal by one and the same loudspeaker chain, using the different directivity for both Channels, is a playback system for stereophonic signals, which differs fundamentally from previously known systems.
  • measures can be taken on the reproduction side in order to enlarge the subjectively felt width of the stereo base.
  • Such measures usually consist of adding an antiphase component (e.g. left) of the other channel to the signal of one channel, for example the right signal, which can also be delayed and the frequency response changed.
  • the arrangements developed for this purpose generally relate to playback systems in which the two stereo sound signals are fed to separate playback systems.
  • Playback systems according to the invention thus open up further possibilities for improving the directional resolution by providing an additional delay and / or filter unit in the electronic part for the purpose of increasing the channel separation for the listener.
  • Such a playback system is shown in Fig.7.
  • the requirements to be placed on the delay and / or filter unit can be determined in an experiment by subjective listening tests and objective measurements using an artificial head.
  • the loudspeakers 310 ... 315 are fed from the left via the channel 323 with the signal 2L-R and from the right via the channel 322 with the signal 2R-L, furthermore also starting from the middle of the Chain with a delayed sum signal L T + R T that is delayed so that it is something arrives at a middle listening position later than the other two signals.
  • the signal addition (2L-R) + (2R-L) (2R t 2L) results for the listener at this middle listening position, which gives a central impression.
  • the listener also receives the delayed signal components (R T + L T ) from the center, which increases the central impression and makes the localization of the center more precise.
  • the specifying signal (R T tL T ) is naturally missing.
  • the listener initially receives the signals (2R) + (-R) in the middle position, which determines the direction "right” due to the higher level of 2R.
  • the delayed portion R T from the center hardly changes this impression, since the law of the first wavefront is known to be effective. If the listener is on a side position to the right of the middle level and a left signal is to be reproduced, (-L) comes first, the signal (t L T ) is somewhat delayed and the signal (2L) a little later.
  • systems according to the present invention can be used not only for spatial reproduction but also for the production of special subjective listening effects. If you change the delay times of the signal during operation of the system, which can be done automatically or manually according to a certain law, the entire audio picture naturally changes.
  • the known Doppler effect occurs in the case of rapid changes, while the changes occur in the case of slow changes Doppler effect remains inaudible, the listener subjectively experiences a hardly describable "turning" of the audio picture, as the virtual sources constantly change their location.
  • FIG. 1 A realizable construction of the arrangement according to the invention is shown once again in FIG. One can recognize here again a turntable 84, a tuner 85, an amplifier 86 and a holophonic device 87, which are stacked one above the other and are located on a table 88.
  • a plurality of tweeter and midrange speakers 90-98 are set up on a platform 89, which are connected to one another by a cable that is not visible in the platform 89.
  • Two standard speakers 99, 100 with woofers are arranged next to the speakers 90-98.
  • the volume of all loudspeakers 90-100 is adjusted with the amplifier 86, as is the sound, the rumble-thump filter and the balance. However, the balance is no longer required in the invention.
  • the volume between the loudspeakers 99, 100 and the loudspeakers 90-98 and the delays can be set.
  • the loudspeakers 90-98 can be normal broadband loudspeakers, but they are expediently designed as mid-high-range speakers from approx. 200 to 300 Hz, since lower frequencies hardly contribute to localization. Accordingly, the loudspeakers 99, 100 can be trimmed to the appropriate (200 to 300 Hz) upper cut-off frequency with a passive or active bass. This allows z. B. the arbitrary placement of mostly large speakers 99, 100 in the living room, while the small speakers 90-98 should be aligned in a straight line.
  • the entire arrangement is about 3m to 4m wide with nine speakers 90-98.
  • the delay time of the left and right channels is freely selectable for each loudspeaker, based on loudspeakers 99, 100 and 90, 98, which are each instantaneous.
  • the subsequent preamplifiers are used to set the level for each speaker and channel, independently of one another, based on the level of speakers 99, 100 or 90, 98.
  • FIGS. 10a-10c show in principle how the loudspeakers 90-98 shown in FIG. 9 can also be attached to a wall using a rail or the like.
  • 10 a shows a loudspeaker 101 which has an opening 102 which is slipped over a carrier 103, this carrier 103 being part of a holding device 105 which can be connected to a wall 104.
  • This holding device also has a cable duct 106 and an obliquely aligned support rail 107.
  • the carrier rail With the aid of the carrier rail, it is possible, as shown in FIG. 10b, to arrange the loudspeaker 101 at an angle by pushing the carrier rail 107 into the opening 102. By rotating the speakers 180 0 or provided with a second opening, it can also be hung from the ceiling 108th This is shown in Fig.lOc.
  • the carrier 103 is used here as a means for fastening the holding device 105 to the ceiling.
  • the device shown in FIGS. 11 and 12 for suspending a loudspeaker L on a surface 10 consists of a profile rail 401 which has two shafts 409 separated by walls 402. Both shafts 409 are each provided with an opening 403 leading to the outside. Between the walls 402, the profile rail 401 has at least two openings 404 which are spaced apart in one plane and to which central openings 405 are assigned, the diameter of the openings 404 being larger than that of the assigned openings 405.
  • the leg 406 is arranged at right angles to the profile rail 401 and is provided with an opening 408 in the center of the leg edges.
  • leg 407 which forms an angle ⁇ of 120 ° with respect to the profile rail surface lying between the legs.
  • the opening 404 serves to introduce a screw which is screwed into the wall through the associated opening 405.
  • the openings 403 serve to guide the cable into and out of the shafts 409.
  • the leg 406 either serves to attach a loudspeaker L parallel to the profile rail 401 or to fasten the profile rail to a ceiling surface 411 by means of a screw passed through the opening 408.
  • the leg 407 is used to attach a loudspeaker L at an angle to the profile rail 401.
  • the loudspeakers L are each provided with a groove 412 on the back so that they can be plugged onto the legs 406 or 407.
  • the speakers are clamped to the profile rail 401 by means of a screw (not shown) attached to the underside of the loudspeaker.
  • FIG. 13 shows a loudspeaker L suspended from the vertical wall 410 by means of the profile rail 401, the loudspeaker being attached to the leg 406.
  • the cable K is guided through the opening 403 of the shaft 409 assigned to the leg 406. This type of attachment of the loudspeaker is expediently carried out at ear level.
  • FIG. 14 shows a loudspeaker L attached to the leg 407 of the profile rail 401 fastened to the wall in the same way as in FIG. 12, the cable routing likewise being carried out by the Opening 403 of the shaft 409 associated with the leg 406 takes place.
  • the type of attachment of the loudspeaker is conveniently at the top of the vertical wall surface 410.
  • FIG. 15 shows the profile rail 401, fastened to a ceiling 411 by means of a screw which is passed through the opening 408 of the leg 406.
  • the loudspeaker L is mounted on the leg 407.
  • the cable is routed through the opening 403 of the shaft 409 assigned to the leg 407.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Stereophonic System (AREA)
EP80104595A 1979-08-18 1980-08-04 Dispositif pour la reproduction acoustique de signaux qui sont représentables au moyen de canaux stéréophoniques de droite et de gauche Ceased EP0025118A1 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
DE19797923615 DE7923615U1 (de) 1979-08-18 1979-08-18 Vorrichtung zur aufhaengung von lautsprechern an einer flaeche
DE7923615U 1979-08-18
DE2933842 1979-08-21
DE19792933842 DE2933842A1 (de) 1979-08-21 1979-08-21 Elektroakustisches wiedergabesystem
DE19792934000 DE2934000A1 (de) 1979-08-22 1979-08-22 Anordnung zur akustischen wiedergabe von signalen
DE2934000 1979-08-22

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EP0025118A1 true EP0025118A1 (fr) 1981-03-18

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Cited By (7)

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Publication number Priority date Publication date Assignee Title
US5961983A (en) * 1991-05-03 1999-10-05 Praxis Biologics, Inc. Stable pura vectors and uses therefor
WO2001023104A2 (fr) * 1999-09-29 2001-04-05 1...Limited Procede et dispositif permettant de diriger le son
EP1722591A2 (fr) 2005-05-09 2006-11-15 Telex Communications, Inc. Système de montage réglable
US7215788B2 (en) 1995-03-31 2007-05-08 1 . . . Limited Digital loudspeaker
US7319641B2 (en) 2001-10-11 2008-01-15 1 . . . Limited Signal processing device for acoustic transducer array
US7515719B2 (en) 2001-03-27 2009-04-07 Cambridge Mechatronics Limited Method and apparatus to create a sound field
US8867749B2 (en) 2011-04-18 2014-10-21 Paul Blair McGowan Acoustic spatial projector

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DE2112516B1 (de) * 1971-03-16 1972-10-19 Kurtze Guenther Dipl Phys Prof Richtlautsprecher
DE2637881A1 (de) * 1976-08-23 1978-03-02 Lucio Jaime Sarmiento Elektroakustisches wiedergabeverfahren zur optimierung der stereomusikabstrahlung
US4105864A (en) * 1975-07-17 1978-08-08 Teledyne Industries, Inc. Stereo and spaciousness reverberation system using random access memory and multiplex

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Publication number Priority date Publication date Assignee Title
DE844169C (de) * 1950-09-01 1952-07-17 Klangfilm Gmbh Lautsprecheranordnung mit Richtwirkung
DE2112516B1 (de) * 1971-03-16 1972-10-19 Kurtze Guenther Dipl Phys Prof Richtlautsprecher
US4105864A (en) * 1975-07-17 1978-08-08 Teledyne Industries, Inc. Stereo and spaciousness reverberation system using random access memory and multiplex
DE2637881A1 (de) * 1976-08-23 1978-03-02 Lucio Jaime Sarmiento Elektroakustisches wiedergabeverfahren zur optimierung der stereomusikabstrahlung

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RADIO MENTOR ELECTRONIC, Band 45, Nr. 10, Oktober 1979, Seite 352, Berlin, DE, "Stereo im Ganzen: Holophonie mit neun Mittel-Hocht�nern". *
WIRELESS WORLD, Band 77, Nr. 1424, Februar 1971, Seiten 67-70, London, G.B., E.J. JORDAN: "Loudspeaker Stereo Techniques". *

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5961983A (en) * 1991-05-03 1999-10-05 Praxis Biologics, Inc. Stable pura vectors and uses therefor
US7215788B2 (en) 1995-03-31 2007-05-08 1 . . . Limited Digital loudspeaker
WO2001023104A2 (fr) * 1999-09-29 2001-04-05 1...Limited Procede et dispositif permettant de diriger le son
WO2001023104A3 (fr) * 1999-09-29 2002-03-14 1 Ltd Procede et dispositif permettant de diriger le son
US7577260B1 (en) 1999-09-29 2009-08-18 Cambridge Mechatronics Limited Method and apparatus to direct sound
US7515719B2 (en) 2001-03-27 2009-04-07 Cambridge Mechatronics Limited Method and apparatus to create a sound field
US7319641B2 (en) 2001-10-11 2008-01-15 1 . . . Limited Signal processing device for acoustic transducer array
EP1722591A3 (fr) * 2005-05-09 2007-02-28 Telex Communications, Inc. Système de montage réglable
WO2006122029A3 (fr) * 2005-05-09 2007-05-10 Telex Communications Systeme de montage reglable pour enceintes acoustiques
WO2006122029A2 (fr) * 2005-05-09 2006-11-16 Telex Communications, Inc. Systeme de montage reglable pour enceintes acoustiques
US7532735B2 (en) 2005-05-09 2009-05-12 Bosch Security Systems, Inc. Adjustable mounting system for speaker enclosures
EP1722591A2 (fr) 2005-05-09 2006-11-15 Telex Communications, Inc. Système de montage réglable
CN101194533B (zh) * 2005-05-09 2012-06-27 泰勒斯通讯公司 用于扬声器箱的可调安装***
US8867749B2 (en) 2011-04-18 2014-10-21 Paul Blair McGowan Acoustic spatial projector

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