EP2080411B1 - Dispositif et procédé pour produire un certain nombre de signaux de haut-parleur pour un réseau de haut-parleurs définissant un espace de restitution - Google Patents

Dispositif et procédé pour produire un certain nombre de signaux de haut-parleur pour un réseau de haut-parleurs définissant un espace de restitution Download PDF

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EP2080411B1
EP2080411B1 EP07818894A EP07818894A EP2080411B1 EP 2080411 B1 EP2080411 B1 EP 2080411B1 EP 07818894 A EP07818894 A EP 07818894A EP 07818894 A EP07818894 A EP 07818894A EP 2080411 B1 EP2080411 B1 EP 2080411B1
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Prior art keywords
loudspeaker
virtual
signals
positions
prestage
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EP2080411A1 (fr
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Michael Strauss
Thomas HÖRNLEIN
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Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
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Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S3/00—Systems employing more than two channels, e.g. quadraphonic
    • H04S3/008—Systems employing more than two channels, e.g. quadraphonic in which the audio signals are in digital form, i.e. employing more than two discrete digital channels
    • 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
    • H04S2420/11—Application of ambisonics in stereophonic audio systems
    • 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

Definitions

  • the present invention relates to the reproduction of spatial audio signals, such as occur in the playback of film material, concerts or in the field of computer and video games.
  • wave field synthesis In the field of spatial audio transmission in the prior art, several methods are known, including, for example, the wave field synthesis, the basic idea is based on the Huygen principle, according to which every point that is detected by a wave is the starting point of an elementary wave, which is spherical or spreads circularly. Wavefield synthesis is applied in acoustics based on a large number of loudspeakers arranged side by side, a so-called loudspeaker array, and is in principle able to emulate any form of incoming wavefront.
  • the audio signals of each loudspeaker can be filtered with a time delay and amplitude scaling so that a corresponding spatial impression results for a listener, with the radiated sound fields of the individual loudspeakers correspondingly overlap. If several sound sources are available, the contribution to each loudspeaker is calculated separately for each source and the resulting signals are added together. If the sources to be reproduced are located in a room with reflective walls, it may be possible to compensate for reflections via corresponding filters with the help of the loudspeaker array.
  • Ambisonic Another known technique for spatial sound field reproduction is Ambisonic. This technique is based on a harmonic decomposition of the acoustic field along a spherical surface (3-D) or along a circumference (2-D). During playback, a finite number of these harmonic components are used to reproduce the original sound field at a point, the listening point. Depending on the number of harmonic components used (called order), the spatial extent of the area of optimal reconstruction of the sound field increases. In the simplest reasonable case (1st order), a sound information is encoded into four channels, which is also known under the synonym Ambisonic B format. A channel contains a mono signal of the sound information. The three other channels contain the spatial components of the three spatial dimensions.
  • Ambisonic allows a spatial audio signal in the described four channels to disassemble, and reassemble accordingly.
  • the signals refer to a reference point, which is arranged in the middle of a sphere, on the surface of which the corresponding loudspeakers are located.
  • the representation of spatial audio signals according to the Ambisonic method thus offer a less complex possibility to store and reproduce spatial signals.
  • a disadvantage of this technology is that the spatial resolution and thus the achievable impression of a room sound are limited.
  • WFS reconstructs within a volume (or area) in a quality that depends on the effort implemented (e.g., LS distance).
  • the signals refer to a reference point in which a listener is ideally located, what the supply a larger area, such as a cinema or a concert hall accordingly difficult.
  • both the playback speakers with respect to the listening point and the virtual sound objects with respect to the playback speakers are located at a sufficiently distant distance, so that in any case even wavefronts can be assumed.
  • DTS Digital Theater System
  • DTS Digital Theater System
  • Methods such as DTS, Dolby Surround can also be considered as encoding formats. This makes it possible to use audio signals suitable for 5.1 reproduction on e.g. save a DVD.
  • variable delay values of a moving audio source give rise to Doppler artifacts.
  • Wave field synthesis is dependent from the computational effort, which in turn depends on the number of virtual audio sources, the number of rendering channels, the source movements, the filtering method, the delay interpolation method and so on.
  • the core idea of the present invention lies in recognizing that, for example with the help of wave field synthesis, a high spatial resolution can be achieved, which can be used to simulate static virtual sound waves.
  • the static virtual sound waves can then be adapted to the respective audio format.
  • the property of the virtual sound waves can be adjusted to the reproduction format so that the characteristics of point sources or plane waves can be used.
  • a 5.1. Audio signal which is transmitted over five z. B. arranged on a circle speaker is reproduced by five simulated sound waves using a wave field synthesis, for example, a speaker array of one hundred speakers, emulated.
  • a wave field synthesis for example, a speaker array of one hundred speakers, emulated.
  • the advantages of wave field synthesis that is, the higher spatial resolution, and the advantages of other spatial audio signal processing methods, such as ambisonic, can be exploited.
  • a plurality of mobile sources can now be reproduced via a wave field synthesis, whereby the computation outlay for the wave field synthesis can be kept constant since this only has to simulate static sources which are based on static filters.
  • An advantage of the method according to the invention is also the selectable adaptation of the complexity of the necessary calculations to the resources available during the reproduction.
  • FIG. 10 shows a device 100 for generating a number of speaker signals 102 for a loudspeaker array that defines a playback space.
  • the apparatus 100 includes a pre-stage 110 configured to generate a plurality of output audio signals 116 using one or more input audio signals 112 associated with one or more virtual locations 114, each output audio signal 116 associated with a loudspeaker position 118 defined by the pre-stage 110, and wherein the pre-stage 110 is configured such that the plurality of output audio signals 116 together simulate a reproduction of the input audio signal (s) 112 at the virtual position (s) 114, and wherein a number of output audio signals 116 is less than a number of loudspeaker signals 102 for the loudspeaker array.
  • the apparatus 100 further includes a main stage 120 configured to receive the plurality of output audio signals 116 and further as a virtual position for each output audio signal 116 to receive the loudspeaker positions 118 determined by the pre-stage 110, and wherein the main stage 120 is formed, to generate the number of speaker signals 102 for the speaker array such that the loudspeaker array replicates the loudspeaker positions 118 defined by the pre-stage 110 as a virtual source.
  • a main stage 120 configured to receive the plurality of output audio signals 116 and further as a virtual position for each output audio signal 116 to receive the loudspeaker positions 118 determined by the pre-stage 110, and wherein the main stage 120 is formed, to generate the number of speaker signals 102 for the speaker array such that the loudspeaker array replicates the loudspeaker positions 118 defined by the pre-stage 110 as a virtual source.
  • the main stage 120 is configured to generate the number of loudspeaker signals 102 and those generated by the pre-stage 110 fixed loudspeaker positions 118 by wave field synthesis.
  • the loudspeaker array is controlled accordingly by the main stage 120.
  • the defined loudspeaker positions 118 are thereby generated statically or in another embodiment semi-statically such that changes in position of the loudspeaker positions 118 occur less frequently or more slowly than changes in position of the virtual positions 114.
  • the main stage 120 is configured to emulate a virtual speaker system that includes fewer speakers than the speaker array.
  • the virtual speaker system can be emulated by point sources or by plane waves. If moving sources are to be simulated, this can be achieved by adapting the output audio signals 116 via the pre-stage 110, wherein the loudspeaker positions 118 can be left unchanged.
  • Input audio signals 112 are conceivable in many formats in embodiments of the present invention.
  • the input audio signals 112 are provided separately from their virtual positions 114 of the pre-stage.
  • Pre-stage 110 via its input terminals, such as in the Fig. 1 the input audio signals 112 and the virtual positions 114, an image area in an audio format available.
  • This image area is then imaged by the device 100 according to the invention into a real area that corresponds to the loudspeaker array and its loudspeaker signals 102.
  • the pre-stage 110 converts the image area into an intermediate area, which can be mapped inexpensively from the main stage 120 into the real area.
  • the inventive device 100 may be further configured to receive additional audio signals or additional locations that are also mapped to the loudspeaker signals 102 and the loudspeaker array, and whose format may differ from the format of the input audio signals 112.
  • additional audio signals or additional locations that are also mapped to the loudspeaker signals 102 and the loudspeaker array, and whose format may differ from the format of the input audio signals 112.
  • the loudspeaker array itself can be realized, for example, by a circular loudspeaker array.
  • the main stage 120 may be designed to map the arbitrary shapes of loudspeaker arrays onto a virtual circle.
  • Fig. 2 an embodiment of a movie theater or concert hall 200.
  • a speaker array 210 is disposed on a circle 215.
  • the speaker array 210 encloses an auditorium 220 in which the spectators are present during a performance.
  • virtual sound waves 225 can now be generated via wave field synthesis.
  • These virtual sound waves 225 can now be used at low cost, ie without increasing the computational requirements of wave field synthesis, in order to generate a spatial sound experience for a viewer in the auditorium 220.
  • wave field synthesis is used as a rendering system with the known advantages.
  • only static sources are represented with the aid of wave field synthesis, which results in the elimination of the disadvantages caused by swelling and, for example, by dynamic filters.
  • the computational effort of the wave field synthesis is kept largely constant, if necessary, the number of virtual sources can be reduced.
  • the wave field synthesis thus provides a constant virtual speaker system.
  • a hybrid method for. As coding of movements in Ambisonic, 5.1, VBAP, etc., now moving sources can be realized via the virtual speaker system.
  • a virtual sound source in the wave field synthesis represents a speaker of the virtual display device for the respective audio playback method into which the dynamic scene can be converted.
  • These virtual speakers can be reproduced in wave field synthesis as point sources or even plane waves.
  • an image area for example in the Ambisonic domain, can be scaled in the degree of representation.
  • the movement of a sound source takes place in the virtual speaker system as a change in volume of the virtual speakers. If necessary, in one embodiment, the duration of an original source, for example, directly in the original area, or changed, as in Higher Order Ambisonic possible, even in the image area.
  • the format of the audio scenes is not subject to any restrictions.
  • a wave field synthesis scene could be made from e.g. B. Ambientic XMT SAW or in any other multi-channel audio playback method, such as 5.1. Characteristic of this hybrid method is a separation into two areas, the original and the image area. Synonymous with this is an independence in the scene creation or coding of the ultimately used speaker set-up.
  • the following is a preferred conversion of WFS input data into Ambisonic data.
  • the starting point is the XML format.
  • the individual sound events are encoded as objects.
  • the following information is contained in the object descriptions: Position of the .wav file with the audio signal of the source, existence period of the source, and movement information of the source (position of the source with time stamps).
  • the coding then takes place as follows: The position (distance and angle of incidence) of the sound source are calculated accurately to the sample. This information can be used to directly calculate Ambisonic signals for simple Ambisonic and Ambisonic-WFS Hybrid. In ambisonic with near-field coding, the ambisonic weighting factors in the frequency domain are calculated. With a window length which allows a good reproduction quality, only a sudden movement of the source is possible. Window overlapping, however, can mitigate the effect. The Ambisonic-WFS hybrid method calculates the symmetry properties of Ambisonic for more efficient computation. When hybrid and near field coded Ambisonic is to be noted that the Ambisonics signals are valid for a circle with a given radius, since the near field effects of both the source and the speaker are included in the calculation.
  • the Ambisonics signals from the hybrid and near-field coded method can also be used directly. If the display does not exactly match, there are two possibilities: The near field effects of the speakers are considered exactly. This takes into account the near-field effect already assumed during decoding. However, this method is expensive.
  • the second possibility is an approximate solution.
  • the signals of the loudspeakers are delayed and amplified according to their distance from the center of the circle. Simulations have shown that this approach provides results comparable to the first (exact) approach.
  • the prerequisite is that the radius of the loudspeaker assumed in the coding is on the order of magnitude of the radii of the playback loudspeakers (best mean value).
  • FIG. 4 A preferred arrangement of the circle is in Fig. 4 shown. If you set the radius so that sources are within the radius, so you would attenuate the signals according to their distance from the center and "accelerate" compared to the other speakers, which z. B. can be achieved by delaying all other speaker signals, so that the one non-delayed speaker is accelerated compared to the other speakers.
  • the pre-stage 110 is preferably configured to change the position of the moved virtual positions 114 by matching the output audio signals 116 and leaving the speaker positions 118 unchanged, the adaptation comprising delaying or amplifying a component component signal originating from a virtual source corresponding to a distance of a virtual source from an imaginary circle center on which the speaker positions are placeable.
  • the loudspeaker component signals for the moving virtual sources be added after the respective delay or gain to produce a matched output audio signal.
  • changing the position of a source away from one loudspeaker and towards another loudspeaker causes the component signal of the source for the loudspeaker from which the source has been moved to be delayed and somewhat attenuated depending on the amount of change in position becomes.
  • the component signal of the loudspeaker to which the source has been moved may be delayed negatively and somewhat amplified depending on the displacement of the position change. If a negative delay is not possible, the signal can not be changed, but all other signals, so that effectively a negative delay or "acceleration" of the one signal with respect to the other signals is achieved.
  • Embodiments of the present invention may also use non-circular or irregular speaker assemblies.
  • the signals are prefiltered according to their reproduction position, ie, their amplitude and phase and sound spectrum are changed in such a way that the distance of a loudspeaker from a virtual circle is compensated.
  • irregular loudspeaker arrangements are restored to a virtual circular loudspeaker arrangement displayed.
  • Fig. 2 also clarified.
  • embodiments of the present invention may map these non-regular speakers to a virtual circle 215 by scaling the corresponding signals in amplitude, and whose delay is adjusted.
  • embodiments of the present invention offer the possibility of adapting the ideal listening area. This possibility is given indirectly by the virtual sound sources, which in another embodiment are adaptable or semi-static.
  • FIG. 12 shows an original area 300, an image area 310, and a wave field synthesis rendering 320.
  • the original area 300 there is, for example, a stereo signal or a signal in any other spatial audio format.
  • This signal can now be converted into an image area, whereby the order of the image area is scalable according to the audio format.
  • the image area 310 could be, for example, an ambisonic signal.
  • the image area 310 is based on the Fig. 1 provided by the pre-stage 110. From the image area 310 is adapted to a speaker setup, which also irregular speaker setups are taken into account, there is a hybridization of the audio signal.
  • Wave field synthesis playback 320 in FIG Fig. 3 corresponds to the main level 120 of Fig. 1 and finally maps the image area into a real area, namely loudspeaker signals for a loudspeaker array.
  • the complexity that is, the computational effort required for wave field synthesis, can thus be finite Number of static filters are restricted.
  • many problems of wave field synthesis with respect to moving sound waves can be solved, such as the occurrence of Doppler artifacts and temporal interpolation artifacts.
  • the computational effort of the wave field synthesis can thus be kept almost constant and much lower than comparable wave field synthesis rendering.
  • the signals of the original range could be made, for example, from the direction coding according to the classical Ambisonic theory and a distance-dependent coding.
  • Distance coding can be done by filtering the ambisonic signals of the individual orders. Near-field effects of the loudspeaker array loudspeakers as well as the coded sound sources can be combined, so that the resulting ambisonic signals can be kept limited.
  • the filters used for wave field synthesis depend both on the frequency of the input signal and on the distance between the loudspeakers and the reproduced sound source. The filtering can be done in the frequency domain, with variable distance, a sliding windowing in the time domain can be made, the filter can be adjusted according to a different distance.
  • a calculation of the near-field-coded ambisonic signals by the hybrid approach provides a filter in the time domain, which is automatically valid for all frequencies.
  • the consideration of different distances of the reproduced sound sources, ie the virtual sound sources is easily possible.
  • Rotational matrices for Ambisonic can also be exploited to reduce the computational burden. The computational effort can then be reduced to a quarter, the two-dimensional case, or to an eighth, in the three-dimensional case, the cost of the direct calculation.
  • Embodiments of the present invention thus offer the advantage that the computational effort of spatial audio signals can be significantly reduced, and an adaptive system is realized.
  • the inventive scheme can also be implemented in software.
  • the implementation may be on a digital storage medium, in particular a floppy disk or a CD with electronically readable control signals, which may cooperate with a programmable computer system such that the corresponding method is executed.
  • the invention thus also consists in a computer program product with program code stored on a machine-readable carrier for carrying out the method according to the invention when the computer program product runs on a computer.
  • the invention can thus be realized as a computer program with a program code for carrying out the method when the computer program product runs on a computer.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Stereophonic System (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Stereophonic Arrangements (AREA)
  • Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)

Claims (18)

  1. Dispositif (100) pour générer un certain nombre de signaux de haut-parleur (102) pour un réseau de haut-parleurs définissant un espace de reproduction, aux caractéristiques suivantes:
    un étage préliminaire (110) qui est réalisé pour générer, à l'aide d'une ou de plusieurs sources virtuelles, une source virtuelle présentant chaque fois un signal audio d'entrée (112) associé à une position virtuelle (114), une pluralité de signaux audio de sortie (116), chaque signal audio de sortie (116) étant associé à une position de haut-parleur (118) fixée par l'étage préliminaire (110), et l'étage préliminaire (110) étant réalisé de sorte que la pluralité de signaux audio de sortie (116) imitent ensemble une reproduction du ou des signaux audio d'entrée (112) à la ou aux positions virtuelles (114), et un nombre de signaux audio de sortie (116) étant inférieur à un nombre de signaux de haut-parleur (102) pour le réseau de haut-parleurs; et
    un étage principal (120) qui est réalisé pour obtenir la pluralité de signaux audio de sortie (116) et pour obtenir par ailleurs, comme position virtuelle pour chaque signal audio de sortie (116), des positions de haut-parleur (118) fixées par l'étage préliminaire (110), et l'étage principal (120) étant réalisé pour générer le nombre de signaux de haut-parleur (102) pour le réseau de haut-parleurs de sorte que par le réseau de haut-parleurs soient imitées, comme sources virtuelles, les positions de haut-parleur (118) fixées par l'étage préliminaire (110).
  2. Dispositif selon la revendication 1,
    dans lequel les sources virtuelles utilisées par l'étage préliminaire (110) sont des sources virtuelles en mouvement à positions variables,
    dans lequel les positions de haut-parleur fixées sont statiques, et
    dans lequel les positions virtuelles correspondant aux positions de haut-parleur statiques fixées sont des positions statiques.
  3. Dispositif (100) selon la revendication 1 ou 2,
    dans lequel l'étage préliminaire est réalisé pour traiter toutes les sources virtuelles en mouvement à partir d'un certain nombre de sources virtuelles introduites comprenant des sources virtuelles en mouvement et statiques, et
    dans lequel l'étage principal est réalisé pour ne traiter que des sources virtuelles statiques,
    les sources virtuelles statiques comprenant les sources virtuelles fixées par les positions de haut-parleur statiques et, en outre, les sources virtuelles statiques introduites.
  4. Dispositif (100) selon l'une des revendications 1 à 3, dans lequel l'étage principal (120) est réalisé pour générer le nombre de signaux de haut-parleur (102) et les positions de haut-parleur (118) fixées par l'étage préliminaire (110) par une synthèse de champ d'onde.
  5. Dispositif (100) selon la revendication 1, dans lequel l'étage préliminaire (110) est réalisé pour générer les positions de haut-parleur (118) fixées de manière statique ou semi-statique de sorte que les modifications de la position de haut-parleur (118) aient lieu moins souvent ou plus lentement que les modifications des positions virtuelles (114).
  6. Dispositif selon l'une des revendications 1 à 5, dans lequel l'étage principal (120) est réalisé pour émuler un système de haut-parleurs virtuel qui comporte moins de haut-parleurs que le réseau de haut-parleurs.
  7. Dispositif (100) selon la revendication 6, dans lequel le système de haut-parleurs virtuel est émulé par des sources ponctuelles ou des ondes planes.
  8. Dispositif (100) selon l'une des revendications 1 à 7, dans lequel l'étage préliminaire (110) est réalisé pour reproduire les modifications des positions virtuelles (114) par une adaptation des signaux audio de sortie (116) et pour laisser les positions de haut-parleur (118) inchangées.
  9. Dispositif (100) selon la revendication 8, dans lequel l'étage (110) est réalisé pour réaliser l'adaptation des signaux audio de sortie (116) au moyen d'une temporisation ou d'une amplification d'un signal de composant de haut-parleur remontant à une source virtuelle selon une distance d'une source virtuelle à partir d'un point central de cercle imaginaire sur lequel peuvent être placées les positions de haut-parleur.
  10. Dispositif (100) selon la revendication 9, dans lequel l'étage préliminaire (110) est réalisé pour additionner, pour chaque position de haut-parleur, les signaux de composant de haut-parleur pour les sources virtuelles en mouvement après la temporisation ou amplification respective, pour générer un signal audio de sortie adapté.
  11. Dispositif (100) selon l'une des revendications 1 à 10, dans lequel l'étage préliminaire (110) est réalisé pour traiter les signaux audio d'entrée (112) qui sont codés selon XMT-SAW, Open-AI 5.1, Ambisonic, Quadrophonic, Prologic, Prologic II, Dolby Digital, Dolby Digital-EX, DTS, DTS-ES, SDDS, 10.2, THX ou IMAX.
  12. Dispositif (100) selon l'une des revendications 1 à 11, réalisé pour mettre à disposition, par l'intermédiaire des signaux audio d'entrée (112) et des positions virtuelles (114), une zone d'image qui est reproduite sur une zone originale par l'intermédiaire des signaux de haut-parleur (102) et du réseau de haut-parleurs.
  13. Dispositif (100) selon l'une des revendications 1 à 12, dans lequel l'étage principal (120) est réalisé pour obtenir des signaux audio additionnels ou des positions additionnelles qui sont reproduits sur les signaux de haut-parleur (102) et le réseau de haut-parleurs, dont le format diffère du format des signaux audio d'entrée (112).
  14. Dispositif (100) selon l'une des revendications 1 à 13, dans lequel l'étage principal (120) est réalisé pour activer un réseau de haut-parleurs circulaire.
  15. Dispositif (100) selon l'une des revendications 1 à 14, dans lequel l'étage principal (120) est réalisé pour activer un réseau de haut-parleurs irrégulier de sorte que les différents signaux de haut-parleur (102) soient adaptés à la forme irrégulière du réseau de haut-parleurs.
  16. Dispositif (100) selon la revendication 15, dans lequel l'étage principal (120) est réalisé pour procéder à l'adaptation des signaux de haut-parleur (102) au réseau de haut-parleurs irrégulier par temporisation et amplification individuelle des signaux de haut-parleur (102).
  17. Procédé pour générer un certain nombre de signaux de haut-parleur (102) pour un réseau de haut-parleurs définissant un espace de reproduction, aux étapes suivantes consistant à:
    générer une pluralité de signaux audio de sortie (116) à l'aide d'une ou de plusieurs sources virtuelles, une source virtuelle présentant chaque fois un signal audio d'entrée (112) associé à une ou plusieurs positions virtuelles (114), chaque signal audio de sortie (116) étant associé à une position de haut-parleur (118) fixée par un étage préliminaire (110), et la pluralité de signaux audio de sortie (116) imitant ensemble une reproduction des signaux audio d'entrée (112) aux positions virtuelles (114), et un nombre de signaux audio de sortie (116) étant inférieur à un nombre de signaux de haut-parleur (102) pour le réseau de haut-parleurs;
    obtenir la pluralité de signaux audio de sortie (116) et les positions de haut-parleur (118) pour chaque signal audio de sortie (116), et
    générer le nombre de signaux de haut-parleur (102) pour le réseau de haut-parleurs de sorte que par le réseau de haut-parleurs soient imitées, comme sources virtuelles, les positions de haut-parleur (118) fixées par l'étage préliminaire (110).
  18. Programme d'ordinateur avec un code de programme pour réaliser le procédé selon la revendication 17 lorsque le programme d'ordinateur est exécuté sur un ordinateur ou sur un microcontrôleur.
EP07818894A 2006-10-11 2007-10-10 Dispositif et procédé pour produire un certain nombre de signaux de haut-parleur pour un réseau de haut-parleurs définissant un espace de restitution Active EP2080411B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102006048205 2006-10-11
DE102006053919A DE102006053919A1 (de) 2006-10-11 2006-11-15 Vorrichtung und Verfahren zum Erzeugen einer Anzahl von Lautsprechersignalen für ein Lautsprecher-Array, das einen Wiedergaberaum definiert
PCT/EP2007/008823 WO2008043549A1 (fr) 2006-10-11 2007-10-10 Dispositif et procédé pour produire un certain nombre de signaux de haut-parleur pour un réseau de haut-parleurs définissant un espace de restitution

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EP2080411A1 EP2080411A1 (fr) 2009-07-22
EP2080411B1 true EP2080411B1 (fr) 2012-04-25

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