EP2182744B1 - Retransmission d'un champ sonore dans une zone de sonorisation ciblée - Google Patents
Retransmission d'un champ sonore dans une zone de sonorisation ciblée Download PDFInfo
- Publication number
- EP2182744B1 EP2182744B1 EP08167919A EP08167919A EP2182744B1 EP 2182744 B1 EP2182744 B1 EP 2182744B1 EP 08167919 A EP08167919 A EP 08167919A EP 08167919 A EP08167919 A EP 08167919A EP 2182744 B1 EP2182744 B1 EP 2182744B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sound field
- reproduced
- decomposition
- drive signal
- desired position
- 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.)
- Not-in-force
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04S—STEREOPHONIC SYSTEMS
- H04S7/00—Indicating arrangements; Control arrangements, e.g. balance control
- H04S7/30—Control circuits for electronic adaptation of the sound field
- H04S7/302—Electronic adaptation of stereophonic sound system to listener position or orientation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04S—STEREOPHONIC SYSTEMS
- H04S2420/00—Techniques used stereophonic systems covered by H04S but not provided for in its groups
- H04S2420/13—Application of wave-field synthesis in stereophonic audio systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04S—STEREOPHONIC SYSTEMS
- H04S7/00—Indicating arrangements; Control arrangements, e.g. balance control
- H04S7/30—Control circuits for electronic adaptation of the sound field
- H04S7/302—Electronic adaptation of stereophonic sound system to listener position or orientation
- H04S7/303—Tracking of listener position or orientation
Definitions
- the present invention relates to the reproduction or reconstruction of a sound field in a target sound area with the aid of a plurality of loudspeakers.
- the technique of wave field synthesis can be used.
- This technique uses a large number of loudspeakers and thereby avoids the problem that in an area within the loudspeaker arrangement, the so-called "sweet spot", the reconstruction of the desired sound field is significantly more accurate than in the rest of the listening area, as is the case for example with the stereo.
- Technique in stereo, however, a soundfield is not physically reconstructed, but two speakers create an illusion that sounds very similar to the natural model, but has very different physical properties.
- stereo there is a sweet spot in that the illusion sounds most authentic at this point).
- the speaker drive signals for each speaker are calculated analytically.
- Ambisonics Another known technique for reconstruction of a sound field is called Ambisonics and is for example in the WO 2005/015954 A2 described.
- This technique requires circular or spherical arrangements of loudspeakers, where the loudspeaker signals are generated using numerical algorithms.
- the limitation of the spatial bandwidth of the drive signals necessary in the calculation path causes the reconstruction of the desired sound field in the center of the loudspeaker arrangement to be most accurate. In the center of the loudspeaker arrangement is therefore a sweet spot. With increasing distance from the center of the loudspeaker arrangement, the deviations in the reconstructed sound field become larger.
- the arrangement of the loudspeakers should be subject to as few restrictions as possible.
- the present invention provides a method and a device for reproducing a sound field in a target sound area.
- electroacoustic transducers ie loudspeakers
- a drive signal for the electroacoustic transducer is determined analytically.
- a resulting sound field which corresponds exactly in an area around the center of the contour, the sweet spot, the sound field to be reproduced.
- the greater the distance from the center the greater the deviations from the sound field to be reproduced, which is inherent in the analytical determination.
- the analytical determination can be achieved according to a known method by analytically solving an integral equation describing the sound field to be reproduced.
- the components of the integral equation can be decomposed into orthogonal basis functions, for example by Fourier decomposition.
- the desired sound field is thus decomposed into basic functions which are orthogonal on the contour on which the loudspeakers are located.
- the desired sound field is then tape-bound with respect to the decomposition around the desired sweet spot.
- the desired sound field is band-limited with respect to the decomposition around the center of the loudspeaker arrangement.
- the connection between the two decompositions represents mathematical translation theorems.
- the starting point is in any case an integral equation.
- the loudspeaker drive signals can be obtained via the relationships of the Kirchhoff-Helmholtz integral (as in wave field synthesis).
- the detected drive signal is changed such that the area where the resulting sound field corresponds to the sound field to be reproduced is shifted from the center of the contour to a desired position within the target sound area.
- This can be done for example by means of mathematical translation theorems.
- the desired position can be predetermined at a fixed position, but it can also be shifted depending on the position of a receiver. In the latter case, the change of the drive signal then preferably takes place in real time. For example, this method can then be used to determine a position of a receiver within the target sounding area and then to change the control signal in such a way that the desired position is adjusted accordingly.
- the changed drive signal is supplied to the electroacoustic transducers.
- the converters convert the input electrical signals into sound signals, and emit them into the target PA range.
- the present invention also provides an apparatus for reproducing a sound field in a target sound area.
- the device has a plurality of electroacoustic transducers arranged on a contour surrounding the target sound area, and a processing module.
- the processing module is able to analytically determine from signals about the desired position and audio input signals a drive signal for the electroacoustic transducers and to change the drive signal such that the sweet spot, ie the area in which the resulting sound field corresponds to the sound field to be reproduced, is moved to the desired position.
- the drive signals can be amplified by means of an amplifier unit and supplied to the electroacoustic transducers.
- the area where the reconstruction of the desired sound field is most accurate can be shifted to a desired position.
- the playback can be optimized to any location within the Zielbeschallungs Kunststoffs. This shift or translation can be performed in real time, so that the playback can be tracked, for example, to a moving receiver.
- the determination of the location of the receiver can be carried out here by means of sensors, for example a camera.
- the invention can be used to reproduce audio signals, in particular multi-channel audio signals.
- the audio signals can be provided by a variety of devices, such as CD, DVD or Blu-ray Disc devices, MP3 devices, computers or the like.
- the reproduced audio signals may be MPEG2 or MPEG4 signals, for example, or be in a Dolby format.
- Fig. 1 schematically a device according to an embodiment of the present invention is shown.
- On a contour 11 to a target PA range 10 more speakers 20 are arranged.
- the drive signals for the speakers 20 are in a processing module 30 determined and supplied via an amplifier unit 31 to the speakers 20.
- the processing module 30 is fed with information 1 about the current location for which the sound reconstruction is to be optimized, ie the so-called sweet spot or the sweet area, and audio input signals 2.
- the sweet spot should be located within the target PA area 10.
- the processing module 30 receives a third input signal 3 which carries information about the desired sound field (eg position of the virtual sound source).
- the drive signal is first of all calculated analytically, for example according to the method described in the above-mentioned publication by J. Ahrens and S. Spors.
- the integral here is a surface or line integral, depending on whether the calculation is to take place in three dimensions or only in one plane.
- the continuous drive function can be described as follows: P v and G v the decomposition coefficients of the sound field and the transfer function are in this case. Again, this is just one example of the description of the continuous drive function. This example applies to the two-dimensional viewing of circular loudspeaker arrangements.
- the center of the decomposition is shifted in the loudspeaker drive signal D equation shown above. This can be done for example by means of various mathematical translation theorems.
- the playback can be optimized to any location within the speaker assembly.
- the inherent sweet spot may be constrained by limiting the spatial bandwidth of the sound field to be reproduced P, which is a function of the location and the frequency, are shifted with respect to the center of the decomposition different from the center of the speaker arrangement.
- the sweet spot or the sweet area is then arranged around this new center of decomposition.
- the decomposition of the sound field around any center x c with a restricted bandwidth 2M + 1 can be represented as follows:
- r 'and ⁇ ' denote the location coordinates with respect to a local coordinate system whose origin is at x c
- J ⁇ denotes the ⁇ -th order Bessel function
- P denotes the decomposition coefficients of the sound field.
- the decomposition coefficients are required with respect to the decomposition around the origin of the global coordinate system whose axes are parallel to those of the local coordinate system.
- theorem for harmonic cylinder functions can be used in the above equation:
- Such a translation of the decomposition center can be carried out in real time, so that the reproduction can be tracked, for example, to a moving receiver.
- a camera can be used to determine the position of the receiver and then optimize the playback to that position.
- the determination of the position of the receiver can also be done by a sensor that the listener carries, for example, in his pocket with it.
- Fig. 2 is shown the sound field generated by the speakers.
- the loudspeakers are located on the circular contour indicated by dashed lines, which surrounds the target PA range.
- Fig. 2a the sound field is shown to result from the analytical determination by the method described above.
- the sweet spot shown by the marked point is at the center of the contour.
- the present invention allows the sweet spot inherent in the system to track so that the sound field reproduction is optimal for the selected receiver.
- the corresponding sound field is in Fig. 2b shown, the only shifted sweet spot in turn marked with a cross.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Stereophonic System (AREA)
- Circuit For Audible Band Transducer (AREA)
Claims (10)
- Procédé de reproduction d'un champ acoustique dans une zone de sonorisation cible au moyen de plusieurs convertisseurs électroacoustiques disposés sur un contour entourant la zone de sonorisation cible, comprenant les étapes :- détermination analytique d'un signal de commande pour les convertisseurs électroacoustiques par décomposition orthogonale du champ acoustique à reproduire autour du centre du contour et par limitation spatiale de bande du champ acoustique à reproduire par rapport à la décomposition de manière que, dans une zone autour du centre du contour, le champ acoustique qui en résulte corresponde au champ acoustique à reproduire;- modification du signal de commande par décalage du centre de la décomposition vers une position souhaitée et limitation spatiale de bande du champ acoustique à reproduire par rapport à la décomposition décalée vers la position souhaitée, au moyen d'un théorème mathématique de translation de manière à décaler la zone dans laquelle le champ acoustique correspond au champ acoustique à reproduire vers la position souhaitée à l'intérieur de la zone de sonorisation cible ; et- fourniture du signal de commande modifié aux convertisseurs électroacoustiques.
- Procédé selon la revendication 1, dans lequel le signal de commande est déterminé par résolution analytique d'une équation intégrale décrivant le champ acoustique à reproduire.
- Procédé selon la revendication 2, dans lequel l'équation intégrale est une intégrale de surface ou de ligne sur le signal de commande des convertisseurs électroacoustiques et la fonction de transmission spatiale.
- Procédé selon la revendication 3, dans lequel la résolution de l'équation intégrale s'effectue par une décomposition du champ acoustique, du signal de commande et de la fonction de transmission en fonctions de base orthogonales.
- Procédé selon la revendication 1, dans lequel le signal de commande est déterminé par les corrélations de l'intégrale de Kirchhoff-Helmholtz.
- Procédé selon l'une des revendications précédentes, dans lequel le décalage vers une position souhaitée s'effectue en temps réel.
- Procédé selon la revendication 6, dans lequel la position souhaitée correspond à la position d'un récepteur en mouvement, la position souhaitée suivant la position du récepteur.
- Dispositif de reproduction d'un champ acoustique dans une zone de sonorisation cible (10), notamment par un procédé selon l'une des revendications précédentes, comprenant plusieurs convertisseurs électroacoustiques (20) et un module de traitement (30) pour fournir un signal de commande aux convertisseurs électroacoustiques (20), le module de traitement (30) étant conçu de manière à déterminer le signal de commande de manière analytique par décomposition orthogonale du champ acoustique à reproduire autour du centre du contour et par limitation spatiale de bande du champ acoustique à reproduire par rapport à la décomposition de manière que le champ acoustique qui en résulte corresponde, dans une zone autour du centre du contour (11), au champ acoustique à reproduire, et à modifier le signal de commande par décalage du centre de la décomposition vers une position souhaitée et par limitation spatiale de bande du champ acoustique à reproduire par rapport à la décomposition décalée vers la position souhaitée au moyen d'un théorème mathématique de translation de manière à décaler la zone dans laquelle le champ acoustique qui en résulte correspond au champ acoustique à reproduire, vers la position souhaitée à l'intérieur de la zone de sonorisation cible (10).
- Dispositif selon la revendication 8, comprenant en plus une unité d'amplificateur (31) pour amplifier le signal de commande modifié, déterminé par le module de traitement (30), et pour fournir le signal amplifié aux convertisseurs électroacoustiques (20).
- Dispositif selon les revendications 8 ou 9, comprenant en plus un lecteur audio pour la fourniture d'un signal audio décrivant le champ acoustique.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT08167919T ATE524029T1 (de) | 2008-10-30 | 2008-10-30 | Wiedergabe eines schallfeldes in einem zielbeschallungsbereich |
EP08167919A EP2182744B1 (fr) | 2008-10-30 | 2008-10-30 | Retransmission d'un champ sonore dans une zone de sonorisation ciblée |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP08167919A EP2182744B1 (fr) | 2008-10-30 | 2008-10-30 | Retransmission d'un champ sonore dans une zone de sonorisation ciblée |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2182744A1 EP2182744A1 (fr) | 2010-05-05 |
EP2182744B1 true EP2182744B1 (fr) | 2011-09-07 |
Family
ID=40202003
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08167919A Not-in-force EP2182744B1 (fr) | 2008-10-30 | 2008-10-30 | Retransmission d'un champ sonore dans une zone de sonorisation ciblée |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP2182744B1 (fr) |
AT (1) | ATE524029T1 (fr) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2469892A1 (fr) * | 2010-09-15 | 2012-06-27 | Deutsche Telekom AG | Reproduction d'un champ sonore dans une zone de sonorisation ciblée |
ES2812503T3 (es) | 2011-03-21 | 2021-03-17 | Deutsche Telekom Ag | Método y sistema para el cálculo de funciones de transmisión de oído externo sintéticas mediante síntesis de campo acústico virtual |
ES2480284T3 (es) | 2011-09-15 | 2014-07-25 | Deutsche Telekom Ag | Síntesis local de un campo acústico por medio de un cuerpo virtual de difusión |
US9268522B2 (en) | 2012-06-27 | 2016-02-23 | Volkswagen Ag | Devices and methods for conveying audio information in vehicles |
EP3209036A1 (fr) * | 2016-02-19 | 2017-08-23 | Thomson Licensing | Procédé, support de stockage lisible par ordinateur et appareil pour determiner une scène sonore cible à une position cible de deux ou plusieurs scènes sonores source |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10305820B4 (de) * | 2003-02-12 | 2006-06-01 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Vorrichtung und Verfahren zum Bestimmen einer Wiedergabeposition |
FR2858512A1 (fr) | 2003-07-30 | 2005-02-04 | France Telecom | Procede et dispositif de traitement de donnees sonores en contexte ambiophonique |
DE102005003431B4 (de) * | 2005-01-25 | 2009-01-15 | Institut für Rundfunktechnik GmbH | Anordnung zum Wiedergeben von binauralen Signalen (Kunstkopfsignalen) durch mehrere Lautsprecher |
-
2008
- 2008-10-30 EP EP08167919A patent/EP2182744B1/fr not_active Not-in-force
- 2008-10-30 AT AT08167919T patent/ATE524029T1/de active
Also Published As
Publication number | Publication date |
---|---|
EP2182744A1 (fr) | 2010-05-05 |
ATE524029T1 (de) | 2011-09-15 |
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