EP2485504B1 - Production de zones silencieuses à l'intérieur de la zone d'auditeurs d'un système de retransmission à plusieurs canaux - Google Patents

Production de zones silencieuses à l'intérieur de la zone d'auditeurs d'un système de retransmission à plusieurs canaux Download PDF

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Publication number
EP2485504B1
EP2485504B1 EP20110153510 EP11153510A EP2485504B1 EP 2485504 B1 EP2485504 B1 EP 2485504B1 EP 20110153510 EP20110153510 EP 20110153510 EP 11153510 A EP11153510 A EP 11153510A EP 2485504 B1 EP2485504 B1 EP 2485504B1
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EP
European Patent Office
Prior art keywords
wave field
loudspeakers
zone
listener
spatial
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EP20110153510
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German (de)
English (en)
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EP2485504A1 (fr
Inventor
Sascha Spors
Karim Helwani
Herbert Buchner
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Deutsche Telekom AG
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Deutsche Telekom AG
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    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R2203/00—Details of circuits for transducers, loudspeakers or microphones covered by H04R3/00 but not provided for in any of its subgroups
    • H04R2203/12—Beamforming aspects for stereophonic sound reproduction with loudspeaker arrays
    • 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 an acoustic wave field in a listener zone by means of several loudspeakers, and more particularly to the formation of a wave-free section within the listener zone.
  • the derivation of the control functions in Higher-Order Ambisonics is done by explicitly solving the underlying physical problem.
  • the speakers are characterized by a circular or spherical continuous distribution of typically models acoustic monopoles that are assigned a weighting function.
  • the integral equation following from this approach can be solved by the representation of the relevant acoustic fields in the form of spherical harmonics.
  • Higher-order Ambisonics allows, in principle, the exact reconstruction of almost any sound field within the secondary source distribution.
  • the continuous distribution of monopoles is realized by a spatially discrete distribution of a finite number of loudspeakers.
  • spectral division Spectral Division Method SDM, see for example J. Ahrens and S. Spors. Sound field reproduction using planar and linear arrays of loudspeakers. IEEE Transactions on Audio, Speech and Language Processing, 18 (8): 2038 - 2050, November 2010 , doi: 10.1109 / TASL.2010.2041106) represents in principle a transfer of the higher-order Ambisonics approach to planar and linear geometries.
  • SDM the underlying physical problem, formulated as an integral equation, is explicitly solved. The solution is achieved by the transition into the spatial spectral range by means of a spatial Fourier transformation. As with Higher-Order Ambisonics, the speaker drive functions in this range are calculated by spectral division.
  • the propagation function (Green's function) of the loudspeakers is needed. After back transformation of the control function from the spectral range to the local area, this is then available for implementation.
  • the thick black ring indicates the arrangement of the loudspeakers, which in the example shown are thus arranged in a circle around the listener zone.
  • the desired wave field is a plane wave that is displayed on the left side of the listener zone.
  • On the right is a small ring in which the sound field is suppressed.
  • the location of the quiet zones in the listener zone or the arrangement of the loudspeakers should be subject to as few restrictions as possible.
  • the object of the invention is achieved by in the method and a device according to claims 1 and 8, respectively.
  • the invention provides a method for reproducing an acoustic wave field in a listener zone by means of several loudspeakers.
  • Applying a spatial window function, such as a rectangular function, to the wave field to be rendered defines a wave-free section in the listener zone in which the wave field is suppressed. This can be done for example by a multiplication of the target sound field with the window function, this corresponds to a spatial convolution in the spatial frequency range.
  • the determination of the drive signals may be performed by a higher order Ambisonics method or a spectral division method.
  • the desired wave field is bandlimited to increase the quality of the suppression of the sound field in the corresponding area of the listener zone.
  • the invention provides a corresponding device for reproducing an acoustic wave field in the listener zone, wherein the wave field is suppressed in one or more predetermined sections of the listener zone.
  • the loudspeakers may be arranged on an open contour, in particular a line, or else on a contour surrounding the listener zone, that is to say for example on a circle or a rectangle.
  • All methods of multi-channel acoustic reproduction systems use a pre-defined mixing matrix which maps the source signals to particular loudspeaker signals to produce a desired auditory impression.
  • the derivation of the control functions in Higher-Order Ambisonics and SDM is done by explicitly solving the underlying physical problem.
  • the suppression of the wave field in certain zones can be interpreted as a multiplication of the original desired field with certain spatial window functions that suppress the sound field in certain areas.
  • this spatial multiplication is a spectral convolution and the spatial suppression is therefore done by a suitable spectral spread of the spatial spectrum of the reproduced spatial signal.
  • the synthesized sound field can be understood as the result of a spatial convolution integral.
  • P x ⁇ ⁇ ⁇ - ⁇ ⁇ D x 0 ⁇ ⁇ ⁇ G ⁇ x - x 0 . ⁇ d x 0 .
  • D represents the drive function of the secondary sources
  • the synthesized sound field corresponds to the desired sound field.
  • the quality of the suppression of the sound field in a certain area depends on the spatial aliasing frequency of the playback system and the cut-off frequency of the reproduced material, because only the spectral components of the reproduced material, which are below the aliasing frequency of the system can be selectively suppressed.
  • a band limitation of the material to be reproduced can be used to avoid spatial aliasing.
  • the mixing matrix on the reproduction side is determined frequency-selectively on the basis of the desired wave field, the position of the recording system and the geometry of the reproduction system.
  • a linear loudspeaker array is discussed, wherein the interception zone with two virtual lines, which are perpendicular to the array, should be divided into three areas. In one area, conventional flat wave reproduction should be based on the spectral division method. In the two other areas in which the recording system can be located, the wave field should be suppressed.
  • the desired wave field is a multiplication of the plane waves with the spatial rectangular function or another suitable window function.
  • the method of spectral division is used. This method requires an expression for both the desired wave field and Green's function in the spatially transformed region for linear array geometries. by means of the Fourier transformation along a reference line on which the reproduction should be exact.
  • the driving functions in the spatial spectral range are the result of element-wise division of the spectrum of the desired field by the spectrum of Green's function.
  • the thus determined spectra of the drive functions can be transformed back into the spatial domain by means of an inverse Fourier transformation.
  • Fig. 1 is the result of a simulation of the presented method and shown in Fig. 2 you can see the energy distribution of the wave field.
  • Fig. 3 the energy distribution is reproduced when the quiet zone, ie the wave-free section, divides the display area into two areas.
  • Array geometries that enclose the audience space in two dimensions, such as rectangular arrays, allow two-dimensional suppression of the field.
  • An example of this is in Fig. 4 shown.
  • the procedure for carrying out the method according to the invention is similar to that described above.
  • the main difference is that the window function here is two-dimensional.
  • the spatially limited wave field is in the spectral range a two-dimensional convolution of the desired field with the spatially transformed window function.
  • the in Fig. 4 Wave field shown a superposition of plane waves, wherein in the synthesis of the individual plane waves, the desired resting area was explicitly considered.
  • the driving functions of the speakers for the in. Fig. 4 The plane waves shown were determined by means of the aforementioned method of spectral division.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Stereophonic System (AREA)

Claims (11)

  1. Procédé de reproduction d'un champ d'ondes acoustiques dans une zone d'audition au moyen de plusieurs haut-parleurs, avec suppression du champ d'ondes dans une ou plusieurs parties prédéterminées de la zone d'audition, ledit procédé comportant les étapes suivantes :
    - détermination d'un champ d'ondes souhaité dans la zone d'audition par application d'une fonction fenêtre spatiale pour former les parties exemptes d'ondes sur un champ d'ondes à reproduire,
    - détermination de signaux de commande pour les haut-parleurs, afin de générer le champ d'ondes souhaité dans la zone d'audition, et
    - transmission des signaux de commande vers les haut-parleurs.
  2. Procédé selon la revendication 1, où, pour la détermination du champ d'ondes souhaité, le champ d'ondes à reproduire est multiplié par la fonction fenêtre spatiale.
  3. Procédé selon la revendication 1, où, pour la détermination du champ d'ondes souhaité, un pliage spatial du spectre du champ d'ondes à reproduire est effectué avec la fonction fenêtre dans la plage de fréquences spatiale.
  4. Procédé selon la revendication 1, où pour la formation de la partie exempte d'ondes, le champ d'ondes à reproduire est spectralement élargi.
  5. Procédé selon l'une des revendications précédentes, où la fonction fenêtre est une fonction rectangle.
  6. Procédé selon l'une des revendications précédentes, où les signaux de commande sont déterminés par un procédé « Higher Order Ambisonics » ou par un procédé de division spectrale.
  7. Procédé selon l'une des revendications précédentes, où le champ d'ondes souhaité est à limitation de bande.
  8. Dispositif de reproduction d'un champ d'ondes acoustiques dans une zone d'audition au moyen de plusieurs haut-parleurs, avec suppression du champ d'ondes dans une ou plusieurs parties prédéterminées de la zone d'audition, comportant :
    - plusieurs haut-parleurs,
    - un dispositif de transmission de signaux de commande vers les haut-parleurs afin de générer un champ d'ondes souhaité avec une partie exempte d'ondes dans la zone d'audition, le champ d'ondes souhaité étant formé par application d'une fonction fenêtre sur un champ d'ondes à reproduire.
  9. Dispositif selon la revendication 8, où les haut-parleurs sont disposés sur un contour ouvert, en particulier sur une ligne.
  10. Dispositif selon la revendication 8, où les haut-parleurs sont disposés sur un contour entourant la zone d'audition.
  11. Dispositif selon la revendication 10, où les haut-parleurs sont disposés sur un cercle ou sur un rectangle.
EP20110153510 2011-02-07 2011-02-07 Production de zones silencieuses à l'intérieur de la zone d'auditeurs d'un système de retransmission à plusieurs canaux Active EP2485504B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20110153510 EP2485504B1 (fr) 2011-02-07 2011-02-07 Production de zones silencieuses à l'intérieur de la zone d'auditeurs d'un système de retransmission à plusieurs canaux

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20110153510 EP2485504B1 (fr) 2011-02-07 2011-02-07 Production de zones silencieuses à l'intérieur de la zone d'auditeurs d'un système de retransmission à plusieurs canaux

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EP2485504A1 EP2485504A1 (fr) 2012-08-08
EP2485504B1 true EP2485504B1 (fr) 2013-10-09

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Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2996094B1 (fr) * 2012-09-27 2014-10-17 Sonic Emotion Labs Procede et systeme de restitution d'un signal audio
US9516440B2 (en) 2012-10-01 2016-12-06 Sonos Providing a multi-channel and a multi-zone audio environment

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