EP1941491B1 - Method and device for actively correcting acoustic properties of an acoustic space listening zone - Google Patents

Method and device for actively correcting acoustic properties of an acoustic space listening zone Download PDF

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Publication number
EP1941491B1
EP1941491B1 EP06808279A EP06808279A EP1941491B1 EP 1941491 B1 EP1941491 B1 EP 1941491B1 EP 06808279 A EP06808279 A EP 06808279A EP 06808279 A EP06808279 A EP 06808279A EP 1941491 B1 EP1941491 B1 EP 1941491B1
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Prior art keywords
signal
resonances
sound
sound signal
acoustic
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EP06808279A
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German (de)
French (fr)
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EP1941491A1 (en
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Philippe Herzog
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Centre National de la Recherche Scientifique CNRS
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Centre National de la Recherche Scientifique CNRS
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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
    • H04S7/301—Automatic calibration of stereophonic sound system, e.g. with test microphone
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1783—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase handling or detecting of non-standard events or conditions, e.g. changing operating modes under specific operating conditions
    • G10K11/17833—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase handling or detecting of non-standard events or conditions, e.g. changing operating modes under specific operating conditions by using a self-diagnostic function or a malfunction prevention function, e.g. detecting abnormal output levels
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1785—Methods, e.g. algorithms; Devices
    • G10K11/17853—Methods, e.g. algorithms; Devices of the filter
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1787—General system configurations

Definitions

  • the invention relates to a method and a device for actively correcting the acoustic properties of a listening area of a sound space.
  • listening area is meant a reduced volume of the sound space in which one or more listeners are likely to be placed to listen to a sound signal.
  • a sound reproduction facility that has been designed to operate in a given environment can have a strongly modified behavior when used in an environment that deviates from that for which it was designed.
  • This problem is very frequently encountered in the case of audio reproduction installations such as Hi-Fi systems and more particularly when they are used in small premises such as living rooms, whose current dimensions lead to annoying resonances. at low frequencies (especially the first clean modes of the room).
  • the reflections of the sound waves on the walls of the room combine to form areas of strong (+) and low (-) pressures distributed spatially in the room, as shown in the diagram. figure 2 .
  • Different distributions of the zones of strong (+) and low (-) pressures are possible. These distributions are characteristic of the room. They each correspond to an acoustic mode that resonates at a specific frequency.
  • Resonance means a mode of transmission of sound waves activated by the multiple reflections of these waves on the walls of the sound space, producing a spatial distribution of the pressure in the sound space disturbing the sound reproduction in the listening area .
  • the correction by processing of the signal to be reproduced is in the first category. It is by far the most widespread. It can be performed by tonal balance corrections (bass / treble adjustment, graphic equalizer), finer frequency corrections (parametric equalizer), or by specific processing (digital filtering system adjusted via the measurement of the response in one or several listening points).
  • tonal balance corrections basic / treble adjustment, graphic equalizer
  • finer frequency corrections finer frequency corrections
  • specific processing digital filtering system adjusted via the measurement of the response in one or several listening points.
  • the method of correction by processing the signal to be reproduced is also limited for fine signal correction which becomes very sensitive to variations in the sound environment.
  • the second category of solutions (correction of the acoustic environment) to limit the influence of the sound reproduction environment is less easy to implement. It is therefore less widespread.
  • the most traditional method is to perform a passive acoustic treatment when it is a listening room or a place of show. The correction must be done in the whole volume, even if the reproduction concerns only a reduced listening area.
  • the object of the present invention is to provide a method and a device for actively correcting the acoustic properties of a listening area of a more effective sound space, aiming to obtain a better homogeneity of the sound signal in a reduced space.
  • the invention makes it possible to correct that which can not be corrected by other approaches, with a complexity of implementation and a reduced cost.
  • the figure 1 represents a device for actively correcting the acoustic properties of a sound space according to the prior art.
  • This device is set up in a sound space 1, usually small as a living room. It comprises a means for reproducing a primary sound signal 2, 4 comprising a reproduction unit of a primary sound signal 2 associated with at least two sources of reproduction of a primary sound signal 4.
  • the reproduction means 2, 4 may consist of a home Hi-Fi system equipped with two speakers.
  • the two sources of reproduction of a primary sound signal 4 and the listening area 27 are advantageously arranged in a stereo triangle in the sound space 1 as recommended by the manufacturers.
  • the reproducing means 2, 4 converts the signal to be reproduced so as to produce a primary sound signal.
  • the signal to be reproduced is an electrical signal from a pre-recording on a compact disc for example.
  • the primary sound signal causes resonances in the sound space 1.
  • the superimposition of the primary sound signal with the resonances forms a disturbed sound signal.
  • a means of attenuation of the resonances makes it possible to limit the influence of the sound space 1 on the reproduction of the sound.
  • This means is commonly called active acoustic correction device of the sound environment.
  • It comprises at least one measuring means 15 of the disturbed sound signal which may be a microphone or a pressure sensor for example.
  • the disturbed sound signal is converted into an electrical signal 32, processed by an electrical signal processing means 6.
  • a processed electrical signal 9 is obtained.
  • At least one secondary sound reproduction source 8 converts the processed electrical signal 9 into a secondary sound signal exciting the resonances so as to attenuate them and obtain a corrected sound signal.
  • the sources of secondary sound reproduction 8 may be for example loudspeakers.
  • the resonances of the disturbed sound signal couple with the amplitudes of the secondary sound signal. This results in a corrected sound signal with fewer resonances. Nevertheless, the listener does not perceive the same corrected sound signal in all the points of the sound space 1.
  • the spatial and therefore frequency distribution of the corrected sound signal are not homogeneous.
  • the figures 2 and 3 represent an example of active correction device of the sound environment according to the invention.
  • the resonant attenuation means is coupled to a signal processing means 3 to reproduce.
  • the signal processing means 3 to be reproduced produces a modified sound signal capable of minimizing the formation of resonances.
  • the signal processing to be reproduced may be a signal processing to be reproduced by equalization for example.
  • the processing of the signal to be reproduced makes it possible to process the signal before it is reproduced by the primary sound reproduction sources 4.
  • the resonance attenuation means and the signal processing means 3 to be reproduced use the signal to be reproduced as reference 31.
  • the measuring means 15 are distributed in several predetermined measurement positions 5 in the sound space 1 so as to allow the detection of all the resonances and more precisely of all the first eigen modes of the sound space 1 hindering the sound reproduction in the listening area 27.
  • the means for measuring the disturbed sound signal may be arranged at positions where the amplitudes produced by the resonances are identical to those present in the listening area 27.
  • the means for measuring the disturbed sound signal 15 can be arranged in the listening area 27.
  • the measuring means 15 measure at least one of the parameters of at least one of the first eigen modes of the sound space 1.
  • the parameter measured can be the gain of high amplitude.
  • the gain can be represented by a matrix defined by two indices, one is dedicated to a measurement position 5 and the other to a specific mode.
  • the measuring means 15 may be arranged along the walls of the sound space 1, approximately every 50 cm for example.
  • the measuring means 15 may be remote from the listening area 27.
  • the figure 2 gives an example of positioning of the measuring means 15 which are installed in predefined positions. These positions 5 are predefined by a preliminary reading of the amplitudes produced by the troublesome resonances in the listening area 27.
  • On the figure 2 two modes are represented, the mode (2,2) ( Figure 2A ) and mode (1,0) ( Figure 2B ). They give rise to two different pressure distributions in the space. Areas of high pressure are separated by low pressure zones 21.
  • the measuring means 15 are then placed at the positions which have the same zones of high pressure as the listening zone 27.
  • each measurement means of the disturbed signal 15 is connected to at least one signal control means 7 of the electrical signal processing means 6.
  • the step of processing the electrical signal takes into account all the disturbed sound signals measured at the different measurement positions 5. This implies that the signal control means 7 is multichannel and that the processing of the electrical signal is matrix.
  • Each secondary sound signal 9 at the output of each signal control means 7 depends on all the disturbed audible signals measured. In other words, all outputs depend on all inputs.
  • Each signal control means 7 processes one or more resonances (modes) at a time.
  • Each signal control means 7, shown in FIG. figure 4 comprises a coefficient assignment means 10 corresponding to each position of a measurement means of the disturbed sound signal 5.
  • Coefficients are attributed to gains, for example, and are weighted according to the position of measures 5.
  • the coefficient is weighted according to the influence of this mode on the primary sound signal at the measurement position 5.
  • the amplitudes of the gains are then summed in a summing means 11 so as to obtain an error signal 29.
  • the error signal 29 and the reference signal 31 are filtered by a filter 12 and 30 respectively in order to isolate the frequencies close to the resonance frequency considered.
  • the processing of the electrical signal comprises a step of combining the disturbed sound signals measured by the measuring means of the disturbed signal 15. This step consists in systematically making a difference between the weighted inputs, that is to say say between the disturbed sound signals measured and weighted by the coefficient assignment means 10.
  • the signal control means 7 of the figure 4 which includes three inputs each assigned to a disturbed sound signal measured. These entries are numbered e1, e2 and e3. A difference is made between the disturbed measured and weighted sound signals. The following difference signals are obtained: e1-e2, e2-e3 and e3-e1. These difference signals correspond in fact to pressure differences between the different measurement positions 5. These difference signals are then summed by the summation means 11 so as to obtain the error signal 29.
  • This combination step improves the performance of the correction device because the difference signals are more characteristic of the resonances than the pressures alone.
  • both the difference signals and the measured and weighted disturbed sound signals are used in the electrical signal processing step.
  • the signal control means 7 the proportion of these two types of signals to be considered in the step of processing the electrical signal is determined.
  • a control filter 13 comprising an algorithm makes it possible to obtain at its output a processed electrical signal 9 which is then amplified by an amplifier 14 before being converted into a secondary sound signal by the loudspeaker 8.
  • the secondary sound signal has amplitudes in phase opposition with respect to those of the resonances.
  • the parameters of the algorithm can be determined beforehand during the installation of the device for the active correction of the acoustic properties in the sound space 1.
  • an adaptive control filter 13 uses, for example, an LMS (Least Mean Squares) algorithm.
  • LMS Least Mean Squares
  • the signal control means 7 Given the inevitable fluctuations of the acoustic environment to be corrected, the signal control means 7 must adapt in real time.
  • Each signal control means 7 comprises a channel 16 connected to a secondary source 8.
  • Each channel can handle multiple modes at once.
  • the correction positions 17 are predetermined so that the amplitudes produced by the secondary sources 8 allow a good coupling with the modes to be processed while limiting the coupling with the other modes in the listening area 27.
  • the frequency density and depreciation is then regulated.
  • the effects obtained are a better homogeneity of the frequency and spatial responses in the listening area 27, and a shorter temporal response. This approach consists in making a spatial correction to obtain a frequency correction.
  • the secondary sources 8 can be placed in the corners of the sound space 1.
  • the correction is performed in a reduced portion of the space corresponding to the position of one or more listeners and more precisely to the ears of listeners. They can be distant from the sources of primary sound reproduction 4. Their position is chosen so that they excite troublesome resonances.
  • the primary sound reproduction sources 4 are used to attenuate annoying resonances.
  • the method and the device for the active correction of the proposed acoustic properties make it possible to obtain a more effective sound reproduction in a listening zone 27 thanks to a better distribution of the pressure in this listening zone 27, resulting in a better distribution. frequency of sound waves.
  • This process is based on a modal approach. We try to treat all the modes at the same time.
  • the invention makes it possible to correct what can not be corrected by other approaches, with a complexity of implementation and a reduced cost.

Description

L'invention concerne un procédé et un dispositif de correction active des propriétés acoustiques d'une zone d'écoute d'un espace sonore.The invention relates to a method and a device for actively correcting the acoustic properties of a listening area of a sound space.

On entend par zone d'écoute un volume réduit de l'espace sonore dans laquelle un ou plusieurs auditeurs sont susceptibles de se placer pour écouter un signal sonore.By listening area is meant a reduced volume of the sound space in which one or more listeners are likely to be placed to listen to a sound signal.

La reproduction d'un signal sonore au moyen d'une installation fixe ou mobile est perturbée par les limites de cette installation (fidélité, qualité de la réponse, dynamique), mais également par les caractéristiques acoustiques de l'environnement dans lequel elle est installée. Ceci se traduit par deux effets principaux. D'une part, le signal reçu en un point est modifié par la propagation au sein de l'environnement (trajets multiples qui interfèrent, résonance, absorption de certains composants), et d'autre part, la réaction de l'environnement sur les sources sonores modifie leur comportement (désaccords de charge acoustique, modification des conditions de rayonnement).The reproduction of a sound signal by means of a fixed or mobile installation is disturbed by the limits of this installation (fidelity, quality of response, dynamics), but also by the acoustic characteristics of the environment in which it is installed. . This results in two main effects. On the one hand, the signal received at a point is modified by the propagation within the environment (multiple paths that interfere, resonance, absorption of certain components), and on the other hand, the reaction of the environment on the sound sources modify their behavior (acoustic charge disagreements, changes in radiation conditions).

De ce fait, une installation de reproduction sonore qui a été conçue pour fonctionner dans un environnement donné peut avoir un comportement fortement modifié lorsqu'elle est utilisée dans un environnement qui s'écarte de celui pour lequel elle a été conçue. Ce problème se pose très fréquemment dans le cas d'installations de reproduction audio telles les chaînes Hi-Fi et plus particulièrement lorsqu'elles sont utilisées dans de petits locaux tels que des pièces d'habitation, dont les dimensions courantes conduisent à des résonances gênantes aux basses fréquences (notamment aux premiers modes propres de la salle).As a result, a sound reproduction facility that has been designed to operate in a given environment can have a strongly modified behavior when used in an environment that deviates from that for which it was designed. This problem is very frequently encountered in the case of audio reproduction installations such as Hi-Fi systems and more particularly when they are used in small premises such as living rooms, whose current dimensions lead to annoying resonances. at low frequencies (especially the first clean modes of the room).

Aux basses fréquences, les réflexions des ondes sonores sur les parois de la salle se combinent pour former des zones de fortes (+) et basses (-) pressions réparties spatialement dans la salle, comme représenté sur la figure 2. Différentes répartitions des zones de fortes (+) et basses (-) pressions sont possibles. Ces répartitions sont caractéristiques de la salle. Elles correspondent chacune à un mode acoustique qui résonne à une fréquence spécifique.At low frequencies, the reflections of the sound waves on the walls of the room combine to form areas of strong (+) and low (-) pressures distributed spatially in the room, as shown in the diagram. figure 2 . Different distributions of the zones of strong (+) and low (-) pressures are possible. These distributions are characteristic of the room. They each correspond to an acoustic mode that resonates at a specific frequency.

On entend par résonance un mode de transmission des ondes sonores activé par les réflexions multiples de ces ondes sur les parois de l'espace sonore, produisant une répartition spatiale de la pression dans l'espace sonore perturbant la reproduction sonore dans la zone d'écoute.Resonance means a mode of transmission of sound waves activated by the multiple reflections of these waves on the walls of the sound space, producing a spatial distribution of the pressure in the sound space disturbing the sound reproduction in the listening area .

L'influence de l'environnement de reproduction étant majeure, de nombreuses solutions ont été cherchées pour la corriger ou la limiter. Ces solutions peuvent être classées en deux catégories générales. D'une part, celles qui visent à modifier le signal avant de le reproduire pour que la reproduction du signal modifié se rapproche du signal original (correction par traitement du signal à reproduire). D'autre part, celles qui visent à modifier les caractéristiques de l'environnement acoustique de manière à réduire son influence sur la reproduction sonore (correction acoustique active par exemple).The influence of the reproduction environment being major, many solutions have been sought to correct or limit it. These solutions can be classified into two general categories. On the one hand, those intended to modify the signal before reproducing it so that the reproduction of the modified signal approaches the original signal (correction by processing the signal to be reproduced). On the other hand, those which aim at modifying the characteristics of the acoustic environment so as to reduce its influence on the sound reproduction (active acoustic correction for example).

La correction par traitement du signal à reproduire se situe dans la première catégorie. Elle est de loin la plus répandue. Elle peut être réalisée par des corrections d'équilibre tonal (réglage grave/aigu, égaliseur graphique), des corrections fréquentielles plus fines (égaliseur paramétrique), ou par des traitements spécifiques (système de filtrage numérique ajusté via la mesure de la réponse en un ou plusieurs points d'écoute). Les dispositifs des documents " Modal Equalization of Loudspeaker-Room Responses at Low Frequencies" (J. Audio. Eng. Soc., Vol.51, N°5, mai03 ) et " Equalization of Room Acoustics and Adaptive Systems in the Equalization of Small Room Acoustics" (AES, 15éme Conférence Internationale ) utilisent ce type de correction.The correction by processing of the signal to be reproduced is in the first category. It is by far the most widespread. It can be performed by tonal balance corrections (bass / treble adjustment, graphic equalizer), finer frequency corrections (parametric equalizer), or by specific processing (digital filtering system adjusted via the measurement of the response in one or several listening points). The features of documents " Modal Equalization of Loudspeaker-Room Responses at Low Frequencies "(J. Audio Eng Soc., Vol.51, No.5, May03 ) and " Equalization of Room Acoustics and Adaptive Systems in the Equalization of Small Room Acoustics "(AES, 15th International Conference ) use this type of correction.

Cependant, l'efficacité des méthodes de correction par traitement du signal à reproduire est limitée par au moins trois limites de principe.However, the effectiveness of the signal processing correction methods to be reproduced is limited by at least three principle limits.

Si l'environnement présente de fortes résonances ou anti-résonances, il n'est pas possible de les compenser par une méthode de traitement du signal à reproduire.If the environment has strong resonances or resonances, it is not possible to compensate for them by a signal processing method to reproduce.

L'influence de l'environnement étant liée à la propagation du son, elle est extrêmement variable d'un point à un autre d'un espace sonore. Une correction du signal ne peut donc concerner qu'une position précise de l'espace. Une correction moyenne se traduit par une dégradation des performances de cette correction.The influence of the environment being related to the sound propagation, it is extremely variable from one point to another of a sound space. A correction of the signal can therefore only concern a precise position of the space. An average correction results in a degradation of the performance of this correction.

La méthode de correction par traitement du signal à reproduire est aussi limitée pour une correction du signal fine qui devient très sensible aux variations de l'environnement sonore.The method of correction by processing the signal to be reproduced is also limited for fine signal correction which becomes very sensitive to variations in the sound environment.

La deuxième catégorie de solutions (correction de l'environnement acoustique) pour limiter l'influence de l'environnement de reproduction sonore est moins facile à mettre en oeuvre. Elle est donc moins répandue. Le procédé le plus classique est d'effectuer un traitement acoustique passif quand il s'agit d'un local d'écoute ou d'un lieu de spectacle. La correction doit se faire dans l'ensemble du volume, même si la reproduction ne concerne qu'une zone d'écoute réduite.The second category of solutions (correction of the acoustic environment) to limit the influence of the sound reproduction environment is less easy to implement. It is therefore less widespread. The most traditional method is to perform a passive acoustic treatment when it is a listening room or a place of show. The correction must be done in the whole volume, even if the reproduction concerns only a reduced listening area.

Il existe également des solutions de correction acoustique active basées sur une installation électroacoustique auxiliaire.There are also active acoustic correction solutions based on an auxiliary electroacoustic installation.

Nous connaissons par ailleurs les brevets FR 2 766 953 et US 4 122 303 qui divulguent cette approche pour réduire le bruit. Les brevets EP 1 088 298 et EP 0 555 787 divulguent un dispositif qui permet de modifier les caractéristiques acoustiques d'un espace auditif. Le document EP 1211668 décrit un "abat - son" actif.We also know the patents FR 2 766 953 and US 4,122,303 who disclose this approach to reduce noise. Licences EP 1 088 298 and EP 0 555 787 disclose a device that makes it possible to modify the acoustic characteristics of an auditory space. The document EP 1211668 describes an active "slaughter".

Ces solutions présentent des limites pratiques. La correction des très basses fréquences nécessite des dispositifs de grandes dimensions, dont l'encombrement est souvent inacceptable, et dont les performances sont limitées. Le nombre important de degré de liberté entraîne une densité d'actionneurs ou de capteurs qui est difficilement acceptable en pratique. De plus, les corrections actives de l'environnement sonore ne disposent pas d'une référence de signal pour effectuer leur traitement ce qui limite le choix des algorithmes de traitement, et conduit souvent à un compromis entre la stabilité et les performances du traitement.These solutions have practical limits. The correction of very low frequencies requires large devices, the size of which is often unacceptable, and whose performance is limited. The large number of degrees of freedom results in a density of actuators or sensors which is difficult to accept in practice. In addition, active corrections of the sound environment do not have a signal reference to perform their processing which limits the choice of processing algorithms, and often leads to a compromise between stability and processing performance.

L'objectif de la présente invention est de proposer un procédé et un dispositif de correction active des propriétés acoustiques d'une zone d'écoute d'un espace sonore plus efficace, visant à obtenir une meilleure homogénéité du signal sonore dans un espace réduit.The object of the present invention is to provide a method and a device for actively correcting the acoustic properties of a listening area of a more effective sound space, aiming to obtain a better homogeneity of the sound signal in a reduced space.

Une meilleure homogénéité du signal sonore dans l'espace réduit entraîne également une meilleure homogénéité fréquentielle.Better homogeneity of the sound signal in the reduced space also results in better frequency homogeneity.

L'invention permet de corriger ce qui n'est pas corrigeable par d'autres approches, avec une complexité de mise en oeuvre et un coût réduit.The invention makes it possible to correct that which can not be corrected by other approaches, with a complexity of implementation and a reduced cost.

A cet effet, l'invention concerne un procédé de correction active des propriétés acoustiques d'une zone d'écoute d'un espace sonore comprenant:

  • une étape de conversion d'un signal à reproduire dans un espace sonore produisant un signal sonore primaire entraînant des résonances dans l'espace sonore, la superposition du signal sonore primaire avec les résonances formant un signal sonore perturbé,
  • une étape d'atténuation des résonances comportant :
    • une étape de mesure du- signal sonore perturbé, ledit signal sonore perturbé étant converti en signal électrique,
    • une étape de traitement du signal électrique formant un signal électrique traité,
    • une étape de conversion par au moins une source de reproduction sonore secondaire dudit signal électrique traité en signal sonore secondaire apte à atténuer lesdites résonances pour obtenir un signal sonore corrigé.
For this purpose, the invention relates to a method for actively correcting the acoustic properties of a listening area of a sound space comprising:
  • a step of converting a signal to be reproduced in a sound space producing a primary sound signal causing resonances in the sound space, the superposition of the primary sound signal with the resonances forming a disturbed sound signal,
  • a resonant attenuation step comprising:
    • a step of measuring the disturbed sound signal, said disturbed sound signal being converted into an electrical signal,
    • a step of processing the electrical signal forming a processed electrical signal,
    • a conversion step by at least one secondary sound reproduction source of said processed electrical signal into a secondary sound signal adapted to attenuate said resonances to obtain a corrected sound signal.

Selon le procédé de l'invention :

  • l'étape de mesure du signal sonore perturbé comprend plusieurs positions de mesures prédéterminées dans l'espace sonore de façon à mesurer des amplitudes de résonances proches de celles des résonances perturbant la reproduction du signal sonore primaire dans la zone d'écoute,
  • le signal sonore secondaire atténuant les résonances est reproduit en plusieurs positions de correction prédéterminées dans l'espace sonore de façon à agir en sens inverse sur lesdites résonances permettant d'obtenir un signal sonore corrigé homogène dans la zone d'écoute,
  • l'étape d'atténuation des résonances est couplée avec une étape de traitement du signal à reproduire de façon à permettre la production d'un signal sonore modifié apte à minimiser la formation des résonances,
  • l'étape de traitement du signal électrique prend en compte tous les signaux sonores perturbés mesurés aux différentes positions de mesures.
According to the process of the invention:
  • the step of measuring the disturbed sound signal comprises several predetermined measurement positions in the space sound so as to measure amplitudes of resonances close to those of the resonances disturbing the reproduction of the primary sound signal in the listening zone,
  • the resonant attenuating secondary sound is reproduced at a plurality of predetermined correction positions in the sound space so as to act in the opposite direction on said resonances to obtain a homogeneous corrected sound signal in the listening area,
  • the resonance attenuation step is coupled with a processing step of the signal to be reproduced so as to allow the production of a modified sound signal capable of minimizing the formation of resonances,
  • the step of processing the electrical signal takes into account all the disturbed sound signals measured at the different measurement positions.

Dans différents modes de réalisation possibles, la présente invention concerne également les caractéristiques qui ressortiront au cours de la description qui va suivre et qui devront être considérées isolément ou selon toutes leurs combinaisons techniquement possibles :

  • le traitement du signal à reproduire est un traitement du signal par égalisation,
  • le traitement du signal électrique-et le traitement du signal à reproduire utilisent le signal à reproduire comme référence,
  • l'étape de traitement du signal électrique comprend une étape d'affectation de coefficients pondérant lesdits coefficients suivant la position de mesures.
In various possible embodiments, the present invention also relates to the features which will emerge during the following description, which should be considered in isolation or in all their technically possible combinations:
  • the processing of the signal to be reproduced is an equalization signal processing,
  • the processing of the electrical signal and the processing of the signal to be reproduced use the signal to be reproduced as a reference,
  • the step of processing the electrical signal comprises a step of assigning coefficients weighting said coefficients according to the position of measurements.

L'invention concerne également un dispositif de correction active des propriétés acoustiques d'une zone d'écoute d'un espace sonore comprenant:

  • un moyen de conversion d'un signal à reproduire dans un espace sonore produisant un signal sonore primaire entraînant des résonances dans l'espace sonore, la superposition du signal sonore primaire avec les résonances formant un signal sonore perturbé,
  • un moyen d'atténuation des résonances comportant :
    • au moins un moyen de mesure du signal sonore perturbé, ledit signal sonore perturbé étant converti en signal électrique,
    • un moyen de traitement du signal électrique permettant la formation un signal électrique traité,
    • au moins une source de reproduction sonore secondaire convertissant ledit signal électrique traité en signal sonore secondaire apte à atténuer lesdites résonances pour obtenir un signal sonore corrigé.
The invention also relates to a device for actively correcting the acoustic properties of a listening area of a sound space comprising:
  • means for converting a signal to be reproduced in a sound space producing a primary sound signal causing resonances in the sound space, the superposition of the primary sound signal with the resonances forming a disturbed sound signal,
  • resonance attenuation means comprising:
    • at least one means for measuring the disturbed sound signal, said disturbed sound signal being converted into an electrical signal,
    • electrical signal processing means for forming a processed electrical signal,
    • at least one secondary sound reproduction source converting said processed electrical signal into a secondary sound signal adapted to attenuate said resonances to obtain a corrected sound signal.

Selon le dispositif de l'invention :

  • les moyens de mesure du signal sonore perturbé sont répartis en plusieurs positions de mesures prédéterminées dans l'espace sonore de façon à mesurer des amplitudes de résonances proches de celles des résonances perturbant la reproduction du signal sonore primaire dans la zone d'écoute,
  • les sources de reproduction sonore secondaire convertissant ledit signal électrique traité en signal sonore secondaire sont répartis en plusieurs positions de correction prédéterminées dans l'espace sonore de façon à agir en sens inverse sur lesdites résonances permettant d'obtenir un signal sonore corrigé homogène dans la zone d'écoute,
  • le moyen d'atténuation des résonances est couplé avec un moyen de traitement du signal à reproduire de façon à permettre la production d'un signal sonore modifié apte à minimiser la formation des résonances,
  • le moyen de traitement du signal électrique 6 comprend au moins un moyen de contrôle du signal 7 relié à chaque moyen de mesure du signal sonore perturbé 15.
According to the device of the invention:
  • the measuring means of the disturbed sound signal are distributed in several predetermined measurement positions in the sound space so as to measure amplitudes of resonances close to those of the resonances disturbing the reproduction of the primary sound signal in the listening zone,
  • the sources of secondary sound reproduction converting said processed electrical signal into a secondary sound signal are distributed in several predetermined correction positions in the sound space so as to act in the opposite direction on said resonances making it possible to obtain a homogeneous corrected sound signal in the zone listening,
  • the resonance attenuation means is coupled with a signal processing means to be reproduced so as to allow the production of a modified sound signal capable of minimizing the formation of resonances,
  • the electrical signal processing means 6 comprises at least one signal control means 7 connected to each measuring means of the disturbed sound signal 15.

Dans différents modes de réalisation possibles, la présente invention concerne également les caractéristiques qui ressortiront au cours de la description qui va suivre et qui devront être considérées isolément ou selon toutes leurs combinaisons techniquement possibles :

  • le moyen de traitement du signal à reproduire est un moyen de traitement du signal par égalisation,
  • le moyen d'atténuation des résonances et le moyen de traitement du signal à reproduire utilisent le signal à reproduire comme référence,
  • le moyen de contrôle du signal comprend un moyen d'affectation de coefficients pondérant lesdits coefficients suivant la position de mesures,
  • chaque moyen de moyen de contrôle du signal comprend une seule voie reliée à une source de reproduction sonore secondaire, ladite source de reproduction sonore secondaire convertissant le signal électrique traité en signai sonore secondaire atténuant au moins une résonance,
  • le moyen de contrôle du signal comprend un filtre de contrôle,
  • le filtre de contrôle est un filtre adaptatif,
  • les moyens de mesure du signal sonore perturbé sont disposés dans la zone d'écoute,
  • les moyens de mesure du signal sonore perturbé sont disposés à la périphérie de l'espace sonore.
In various possible embodiments, the present invention also relates to the features that will emerge in the course of the description which follows and which will have to be considered in isolation or in all their technically possible combinations:
  • the signal processing means to be reproduced is an equalization signal processing means,
  • the resonance attenuation means and the signal processing means to be reproduced use the signal to be reproduced as a reference,
  • the signal control means comprises coefficient assigning means weighting said coefficients according to the measurement position,
  • each means of signal control means comprises a single channel connected to a secondary sound reproduction source, said secondary sound reproduction source converting the processed electrical signal into a secondary sound signal attenuating at least one resonance,
  • the signal control means comprises a control filter,
  • the control filter is an adaptive filter,
  • the measuring means of the disturbed sound signal are arranged in the listening zone,
  • the measuring means of the disturbed sound signal are arranged at the periphery of the sound space.

L'invention sera décrite plus en détail en référence aux dessins annexés dans lesquels :

  • la figure 1 représente un exemple de dispositif de correction active des propriétés acoustiques d'un espace sonore selon l'art antérieur ;
  • la figure 2 est une représentation schématique d'un dispositif de correction active des propriétés acoustiques d'un espace sonore corrigeant, par exemple, les deux modes acoustiques (2,2) A) et (1,0) B) présents dans une zone d'écoute, selon un mode de réalisation de l'invention ;
  • la figure 3 est une représentation schématique plus détaillée du dispositif de correction active des propriétés acoustiques d'un espace sonore selon un mode de réalisation de l'invention ;
  • la figure 4 est une représentation schématique d'un moyen de traitement du signal électrique ;
The invention will be described in more detail with reference to the accompanying drawings in which:
  • the figure 1 represents an example of active correction device acoustic properties of a sound space according to the prior art;
  • the figure 2 is a schematic representation of a device for actively correcting the acoustic properties of a sound space correcting, for example, the two acoustic modes (2,2) A) and (1,0) B) present in a listening area according to one embodiment of the invention;
  • the figure 3 is a more detailed schematic representation of the device for active correction of properties acoustics of a sound space according to one embodiment of the invention;
  • the figure 4 is a schematic representation of a means for processing the electrical signal;

La figure 1 représente un dispositif de correction active des propriétés acoustiques d'un espace sonore selon l'art antérieur.The figure 1 represents a device for actively correcting the acoustic properties of a sound space according to the prior art.

Ce dispositif est mis en place dans un espace sonore 1, habituellement de petite dimension telle une pièce d'habitation. Il comprend un moyen de reproduction d'un signal sonore primaire 2, 4 comportant une unité de reproduction d'un signal sonore primaire 2 associée à au moins deux sources de reproduction d'un signal sonore primaire 4. Le moyen de reproduction 2, 4 peut consister en une chaîne Hi-Fi domestique équipée de deux hauts parleurs.This device is set up in a sound space 1, usually small as a living room. It comprises a means for reproducing a primary sound signal 2, 4 comprising a reproduction unit of a primary sound signal 2 associated with at least two sources of reproduction of a primary sound signal 4. The reproduction means 2, 4 may consist of a home Hi-Fi system equipped with two speakers.

Les deux sources de reproduction d'un signal sonore primaire 4 et la zone d'écoute 27 sont avantageusement disposés en triangle stéréo dans l'espace sonore 1 comme le recommandent les constructeurs.The two sources of reproduction of a primary sound signal 4 and the listening area 27 are advantageously arranged in a stereo triangle in the sound space 1 as recommended by the manufacturers.

Le moyen de reproduction 2, 4 convertit le signal à reproduire de façon à produire un signal sonore primaire. Le signal à reproduire est un signal électrique provenant d'un préenregistrement sur un disque compact par exemple.The reproducing means 2, 4 converts the signal to be reproduced so as to produce a primary sound signal. The signal to be reproduced is an electrical signal from a pre-recording on a compact disc for example.

Le signal sonore primaire entraîne des résonances dans l'espace sonore 1. La superposition du signal sonore primaire avec les résonances forme un signal sonore perturbé.The primary sound signal causes resonances in the sound space 1. The superimposition of the primary sound signal with the resonances forms a disturbed sound signal.

Un moyen d'atténuation des résonances permet de limiter l'influence de l'espace sonore 1 sur la reproduction du son. Ce moyen est communément appelé dispositif de correction acoustique active de l'environnement sonore.A means of attenuation of the resonances makes it possible to limit the influence of the sound space 1 on the reproduction of the sound. This means is commonly called active acoustic correction device of the sound environment.

Il comporte au moins un moyen de mesure 15 du signal sonore perturbé qui peut être un microphone ou un capteur de pression par exemple.It comprises at least one measuring means 15 of the disturbed sound signal which may be a microphone or a pressure sensor for example.

Le signal sonore perturbé est converti en signal électrique 32, traité par un moyen de traitement du signal électrique 6. On obtient un signal électrique traité 9.The disturbed sound signal is converted into an electrical signal 32, processed by an electrical signal processing means 6. A processed electrical signal 9 is obtained.

Au moins une source de reproduction sonore secondaire 8 convertie le signal électrique traité 9 en signal sonore secondaire excitant les résonances de façon à les atténuer et à obtenir un signal sonore corrigé.At least one secondary sound reproduction source 8 converts the processed electrical signal 9 into a secondary sound signal exciting the resonances so as to attenuate them and obtain a corrected sound signal.

Les sources de reproduction sonore secondaire 8 peuvent être par exemple des hauts parleurs.The sources of secondary sound reproduction 8 may be for example loudspeakers.

Les résonances du signal sonore perturbé se couplent avec les amplitudes du signal sonore secondaire. Il en résulte un signal sonore corrigé avec moins de résonances. Néanmoins, l'auditeur ne perçoit pas le même signal sonore corrigé dans tous les points de l'espace sonore 1. La répartition spatiale et donc fréquentielle du signal sonore corrigé ne sont pas homogènes.The resonances of the disturbed sound signal couple with the amplitudes of the secondary sound signal. This results in a corrected sound signal with fewer resonances. Nevertheless, the listener does not perceive the same corrected sound signal in all the points of the sound space 1. The spatial and therefore frequency distribution of the corrected sound signal are not homogeneous.

Les figures 2 et 3 représentent un exemple de dispositif de correction active de l'environnement sonore selon l'invention.The figures 2 and 3 represent an example of active correction device of the sound environment according to the invention.

Le moyen d'atténuation des résonances est couplé avec un moyen de traitement du signal à reproduire 3. Le moyen de traitement du signal à reproduire 3 produit un signal sonore modifié apte à minimiser la formation des résonances.The resonant attenuation means is coupled to a signal processing means 3 to reproduce. The signal processing means 3 to be reproduced produces a modified sound signal capable of minimizing the formation of resonances.

Le traitement du signal à reproduire peut être un traitement du signal à reproduire par égalisation par exemple.The signal processing to be reproduced may be a signal processing to be reproduced by equalization for example.

Le traitement du signal à reproduire permet de réaliser un traitement du signal avant qu'il ne soit reproduit par les sources de reproduction sonore primaire 4.The processing of the signal to be reproduced makes it possible to process the signal before it is reproduced by the primary sound reproduction sources 4.

L'utilisation d'un moyen d'atténuation des résonances permet d'obtenir un traitement du signal à reproduire plus efficace.The use of a resonant attenuation means provides a more efficient signal processing to reproduce.

Le moyen d'atténuation des résonances et le moyen de traitement du signal à reproduire 3 utilisent le signal à reproduire comme référence 31.The resonance attenuation means and the signal processing means 3 to be reproduced use the signal to be reproduced as reference 31.

Les moyens de mesure 15 sont répartis en plusieurs positions de mesure 5 prédéterminées dans l'espace sonore 1 de façon à permettre la détection de toutes les résonances et plus précisément de tous les premiers modes propres de l'espace sonore 1 gênant la reproduction sonore dans la zone d'écoute 27.The measuring means 15 are distributed in several predetermined measurement positions 5 in the sound space 1 so as to allow the detection of all the resonances and more precisely of all the first eigen modes of the sound space 1 hindering the sound reproduction in the listening area 27.

Les moyens de mesure du signal sonore perturbé 15 peuvent être disposés à des positions où les amplitudes produites par les résonances sont identiques à celles présentes dans la zone d'écoute 27.The means for measuring the disturbed sound signal may be arranged at positions where the amplitudes produced by the resonances are identical to those present in the listening area 27.

Les moyens de mesure du signal sonore perturbé 15 peuvent être disposés dans la zone d'écoute 27.The means for measuring the disturbed sound signal 15 can be arranged in the listening area 27.

Les moyens de mesure 15 mesurent au moins un des paramètres d'au moins un des premiers modes propres de l'espace sonore 1. Le paramètre mesuré peut être le gain d'amplitude élevée. Le gain peut être représenté par une matrice définie par deux indices, l'un est dédié à une position de mesures 5 et l'autre à un mode propre.The measuring means 15 measure at least one of the parameters of at least one of the first eigen modes of the sound space 1. The parameter measured can be the gain of high amplitude. The gain can be represented by a matrix defined by two indices, one is dedicated to a measurement position 5 and the other to a specific mode.

Ces paramètres peuvent être mesurés, comme dit précédemment, dans une zone d'écoute 27 où les premiers modes propres sont particulièrement émergents et également dans une gamme de fréquence dans laquelle les premiers modes propres sont particulièrement gênants.These parameters can be measured, as said above, in a listening area 27 where the first eigenmodes are particularly emergent and also in a frequency range in which the first eigen modes are particularly troublesome.

Dans un mode de réalisation particulier les moyens de mesure 15 peuvent être disposés le long des murs de l'espace sonore 1 , environ tous les 50 cm par exemple.In a particular embodiment, the measuring means 15 may be arranged along the walls of the sound space 1, approximately every 50 cm for example.

Dans un autre mode de réalisation, les moyens de mesure 15 peuvent être éloignés de la zone d'écoute 27.In another embodiment, the measuring means 15 may be remote from the listening area 27.

La figure 2 donne un exemple de positionnement des moyens de mesure 15 qui sont installés en des positions 5 prédéfinies. Ces positions 5 sont prédéfinies par un relevé au préalable des amplitudes produites par les résonances gênantes dans la zone d'écoute 27. Sur la figure 2, deux modes sont représentés, le mode (2,2) (figure 2A) et le mode (1,0) (figure 2B). Ils donnent lieu à deux répartitions de pression dans l'espace différentes. Des zones de forte pression 20 sont séparées par des zones de basse pression 21.The figure 2 gives an example of positioning of the measuring means 15 which are installed in predefined positions. These positions 5 are predefined by a preliminary reading of the amplitudes produced by the troublesome resonances in the listening area 27. On the figure 2 two modes are represented, the mode (2,2) ( Figure 2A ) and mode (1,0) ( Figure 2B ). They give rise to two different pressure distributions in the space. Areas of high pressure are separated by low pressure zones 21.

D'après le relevé, on détecte que ces deux modes sont présents dans la zone d'écoute 27 et qu'ils génèrent tous les deux une zone de forte pression 20 dans cette zone d'écoute 27.From the survey, it is detected that these two modes are present in the listening area 27 and that they both generate a zone of high pressure in this listening area 27.

On va donc continuer le relevé de façon à détecter d'autres positions de l'espace sonores présentant des zones de forte pression 20 similaires. Plus précisément, on cherche des signaux sonores ayant des amplitudes, aux fréquences de résonance, proches de celles présentes dans la zone d'écoute 27 aux mêmes fréquences. On entend par proche, des amplitudes ayant le même signe. On réalise ainsi une carte de résonances de l'espace sonores 1.We will continue the survey so as to detect other positions of the sound space with similar areas of high pressure. More precisely, sound signals having amplitudes at resonant frequencies close to those present in the listening zone 27 at the same frequencies are sought. By close we mean amplitudes having the same sign. A sound space resonance map 1 is thus produced.

On place ensuite les moyens de mesure 15 aux positions qui présentent les mêmes zones de forte pression 20 que la zone d'écoute 27.The measuring means 15 are then placed at the positions which have the same zones of high pressure as the listening zone 27.

Comme représenté sur la figure 3, les moyens de mesure 15 sont reliés à un moyen de traitement du signal électrique 6. Plus précisément, chaque moyen de mesures du signal perturbé 15 est relié à au moins un moyen de contrôle du signal 7 du moyen de traitement du signal électrique 6. L'étape de traitement du signal électrique prend en compte tous les signaux sonores perturbés mesurés aux différentes positions de mesures 5. Cela implique que le moyen de contrôle du signal 7 est multicanal et que le traitement du signal électrique est matriciel. Chaque signal sonore secondaire 9 en sortie de chaque moyen de contrôle du signal 7 dépend de tous les signaux sonores perturbés mesurés. Autrement dit, toutes les sorties dépendent de toutes les entrées.As shown on the figure 3 the measuring means 15 are connected to a means for processing the electrical signal 6. More precisely, each measurement means of the disturbed signal 15 is connected to at least one signal control means 7 of the electrical signal processing means 6. The step of processing the electrical signal takes into account all the disturbed sound signals measured at the different measurement positions 5. This implies that the signal control means 7 is multichannel and that the processing of the electrical signal is matrix. Each secondary sound signal 9 at the output of each signal control means 7 depends on all the disturbed audible signals measured. In other words, all outputs depend on all inputs.

Chaque moyen de contrôle du signal 7 traite une ou plusieurs résonances (modes) à la fois.Each signal control means 7 processes one or more resonances (modes) at a time.

Chaque moyen de contrôle du signal 7, représenté sur la figure 4, comprend un moyen d'affectation de coefficients 10 correspondant à chaque position d'un moyen de mesure du signal sonore perturbé 5.Each signal control means 7, shown in FIG. figure 4 , comprises a coefficient assignment means 10 corresponding to each position of a measurement means of the disturbed sound signal 5.

Des coefficients sont attribués aux gains, par exemple, et sont pondérés en fonction de la position de mesures 5.Coefficients are attributed to gains, for example, and are weighted according to the position of measures 5.

Pour un mode propre donné, le coefficient est pondéré suivant l'influence de ce mode sur le signal sonore primaire à la position de mesures 5.For a given eigen mode, the coefficient is weighted according to the influence of this mode on the primary sound signal at the measurement position 5.

Les amplitudes des gains sont ensuite sommées dans un moyen de sommation 11 de façon à obtenir un signal d'erreur 29. Le signal d'erreur 29 et le signal de référence 31 sont filtrés par un filtre 12 et 30 respectivement de façon à isoler les fréquences voisines de la fréquence de résonance considérée.The amplitudes of the gains are then summed in a summing means 11 so as to obtain an error signal 29. The error signal 29 and the reference signal 31 are filtered by a filter 12 and 30 respectively in order to isolate the frequencies close to the resonance frequency considered.

Dans un mode de réalisation particulier, le traitement du signal électrique comprend une étape de combinaison des signaux sonores perturbés mesurés par les moyens de mesures du signal perturbé 15. Cette étape consiste à effectuer systématiquement une différence entre les entrées pondérées, c'est-à-dire entre les signaux sonores perturbés mesurés et pondérés par les moyens d'affectation de coefficients 10.In a particular embodiment, the processing of the electrical signal comprises a step of combining the disturbed sound signals measured by the measuring means of the disturbed signal 15. This step consists in systematically making a difference between the weighted inputs, that is to say say between the disturbed sound signals measured and weighted by the coefficient assignment means 10.

Prenons comme exemple le moyen de contrôle du signal 7 de la figure 4 qui comprend trois entrées affectées chacune à un signal sonore perturbé mesuré. Ces entrées sont numérotées e1, e2 et e3. On effectue une différence entre les signaux sonores perturbés mesurés et pondérés. On obtient les signaux de différences suivant : e1-e2, e2-e3 et e3-e1. Ces signaux de différences correspondent en fait à des différences de pression entre les différentes positions de mesures 5. Ces signaux de différences sont ensuite sommés par le moyen de sommation 11 de façon à obtenir le signal d'erreur 29.Let's take as an example the signal control means 7 of the figure 4 which includes three inputs each assigned to a disturbed sound signal measured. These entries are numbered e1, e2 and e3. A difference is made between the disturbed measured and weighted sound signals. The following difference signals are obtained: e1-e2, e2-e3 and e3-e1. These difference signals correspond in fact to pressure differences between the different measurement positions 5. These difference signals are then summed by the summation means 11 so as to obtain the error signal 29.

Cette étape de combinaison améliore les performances du dispositif de correction car les signaux de différences sont plus caractéristiques des résonances que les pressions seules.This combination step improves the performance of the correction device because the difference signals are more characteristic of the resonances than the pressures alone.

Dans un autre mode de réalisation, à la fois les signaux de différences et les signaux sonores perturbés mesurés et pondérés sont utilisés dans l'étape de traitement du signal électrique. Lors du réglage du moyen de contrôle du signal 7, on détermine la proportion des ces deux types de signaux à considérer dans l'étape de traitement du signal électrique.In another embodiment, both the difference signals and the measured and weighted disturbed sound signals are used in the electrical signal processing step. When adjusting the signal control means 7, the proportion of these two types of signals to be considered in the step of processing the electrical signal is determined.

Un filtre de contrôle 13 comportant un algorithme permet d'obtenir à sa sortie un signal électrique traité 9 qui est ensuite amplifié par un amplificateur 14 avant d'être converti en signal sonore secondaire par le haut parleur 8. A une fréquence de résonance donnée, le signal sonore secondaire présente des amplitudes en opposition de phase par rapport à celles des résonances.A control filter 13 comprising an algorithm makes it possible to obtain at its output a processed electrical signal 9 which is then amplified by an amplifier 14 before being converted into a secondary sound signal by the loudspeaker 8. At a frequency of given resonance, the secondary sound signal has amplitudes in phase opposition with respect to those of the resonances.

Par couplage, les amplitudes s'atténuent. On obtient un signal sonore corrigé ne présentant pas ou peu de résonances dans la zone d'écoute 27.By coupling, the amplitudes are attenuated. A corrected sound signal is obtained with little or no resonance in the listening area 27.

Les paramètres de l'algorithme peuvent être déterminés au préalable lors de l'installation du dispositif de correction active des propriétés acoustiques dans l'espace sonore 1.The parameters of the algorithm can be determined beforehand during the installation of the device for the active correction of the acoustic properties in the sound space 1.

Il est possible d'utiliser un filtre de contrôle 13 adaptatif utilisant, par exemple, un algorithme de type LMS (Least Mean Squares).It is possible to use an adaptive control filter 13 using, for example, an LMS (Least Mean Squares) algorithm.

Compte tenu des fluctuations inévitables de l'environnement acoustique à corriger, le moyen de contrôle du signai 7 doit s'y adapter en temps réel.Given the inevitable fluctuations of the acoustic environment to be corrected, the signal control means 7 must adapt in real time.

Cela peut également être obtenu par la mesure de grandeurs (ex. la température) servant à modifier les paramètres de l'algorithme.This can also be obtained by measuring quantities (eg temperature) used to modify the parameters of the algorithm.

Chaque moyen de contrôle du signal 7 comprend une voie 16 reliée à une source secondaire 8.Each signal control means 7 comprises a channel 16 connected to a secondary source 8.

Chaque voie peut traiter plusieurs modes à la fois.Each channel can handle multiple modes at once.

Les positions de correction 17 sont prédéterminées de façon à ce que les amplitudes produites par les sources secondaires 8 permettent un bon couplage avec les modes à traiter tout en limitant le couplage avec les autres modes dans la zone d'écoute 27. La densité fréquentielle et les amortissements sont alors régulés. Les effets obtenus sont une meilleure homogénéité des réponses fréquentielles et spatiales dans la zone d'écoute 27, et une réponse temporelle plus courte. Cette approche consiste à réaliser une correction spatiale pour obtenir une correction fréquentielle.The correction positions 17 are predetermined so that the amplitudes produced by the secondary sources 8 allow a good coupling with the modes to be processed while limiting the coupling with the other modes in the listening area 27. The frequency density and depreciation is then regulated. The effects obtained are a better homogeneity of the frequency and spatial responses in the listening area 27, and a shorter temporal response. This approach consists in making a spatial correction to obtain a frequency correction.

Dans un mode de réalisation particulier, on peut placer les sources secondaires 8 dans les coins de l'espace sonore 1.In a particular embodiment, the secondary sources 8 can be placed in the corners of the sound space 1.

La correction est réalisée dans une portion réduite de l'espace correspondant à la position d'un ou plusieurs auditeurs et plus précisément aux oreilles des auditeurs. Elles peuvent être distantes des sources de reproduction sonore primaire 4. Leur position est choisie de façon à ce qu'elles excitent les résonances gênantes.The correction is performed in a reduced portion of the space corresponding to the position of one or more listeners and more precisely to the ears of listeners. They can be distant from the sources of primary sound reproduction 4. Their position is chosen so that they excite troublesome resonances.

Dans un autre mode de réalisation, il est également possible d'appliquer cette correction dans plusieurs zones d'écoute 27.In another embodiment, it is also possible to apply this correction in several listening areas 27.

Dans un autre mode de réalisation, les sources de reproduction sonore primaires 4 sont utilisées pour atténuer les résonances gênantes.In another embodiment, the primary sound reproduction sources 4 are used to attenuate annoying resonances.

Dans un autre mode de réalisation, un échange d'informations entre le moyen de contrôle du signal 7 et le moyen de traitement du signal à reproduire 3 est possible.In another embodiment, an exchange of information between the signal control means 7 and the signal processing means 3 to reproduce is possible.

Ainsi, le procédé et le dispositif de correction active des propriétés acoustiques proposé permettent d'obtenir une reproduction sonore plus efficace dans une zone d'écoute 27 grâce à une meilleure répartition de la pression dans cette zone d'écoute 27, entraînant une meilleure répartition fréquentielle des ondes sonores.Thus, the method and the device for the active correction of the proposed acoustic properties make it possible to obtain a more effective sound reproduction in a listening zone 27 thanks to a better distribution of the pressure in this listening zone 27, resulting in a better distribution. frequency of sound waves.

Ce procédé est basé sur une approche modale. On cherche à traiter tous les modes en même temps.This process is based on a modal approach. We try to treat all the modes at the same time.

L'invention permet de corriger ce qui n'est pas corrigeable par d'autres approches, avec une complexité de mise en oeuvre et un coût réduits.The invention makes it possible to correct what can not be corrected by other approaches, with a complexity of implementation and a reduced cost.

Claims (13)

  1. A method for actively correcting the acoustic properties of a listening zone (27) of an acoustic space (1) inducting:
    a step of converting a signal to be reproduced in an acoustic space (1) producing a primary sound signal causing resonances in the acoustic space (1), the superimposition of the primary sound signal with the resonances forming a perturbed sound signal,
    a step of attenuating resonances comprising:
    a step of measuring the perturbed sound signal, said perturbed sound signal being converted into an electrical signal (32),
    a step of processing the electrical signal (32) forming a processed electric signal (9),
    a step of converting by at least one secondary sound reproduction source (8) said processed electrical signal (9) into a secondary sound signal capable of attenuating said resonances to obtain a corrected sound signal, characterised in that:
    the step of measuring the perturbed sound signal includes several measuring positions (5) predetermined in the acoustic space (1) so as to measure resonance amplitudes close to those of the resonances perturbing the reproduction of the primary sound signal in the listening zone (27),
    the secondary sound signal attenuating the resonances is reproduced in several correcting positions (17) predetermined in the acoustic space (1) so as to act in reverse direction on said resonances enabling to obtain a homogeneous corrected sound signal in the listening zone (27),
    the step of attenuating the resonances is coupled with a step of processing the signal to be reproduced so as to enable the generation of a modified sound signal capable of minimising the formation of the resonances,
    the step of processing the electrical signal takes into account all the perturbed sound signals measured at the different measuring positions (5).
  2. A method for acoustic correction according to claim 1, characterised in that the processing of the signal to be reproduced is a signal processing by equalization.
  3. A method for acoustic correction according to claim 1 or 2, characterised in that the processing of the electrical signal and the processing of the signal to be reproduced use the signal to be reproduced as a reference (31).
  4. A method for acoustic correction according to anyone of claims 1 to 3, characterised in that the step of processing the electrical signal includes a step of allocating coefficients weighting said coefficients according to the measuring position (5).
  5. A device for actively correcting the acoustic of a listening zone (1) of an acoustic space including:
    a means for converting a signal to be reproduced (2, 4) in an acoustic space (1) producing a primary acoustic signal causing resonances in the acoustic space (1), the superimposition of the primary sound signal with the resonances forming a perturbed sound signal,
    a means for attenuating resonances comprising:
    at least one means for measuring the perturbed sound signal (15), said perturbed sound signal being converted into an electrical signal (32),
    a means for processing the electrical signal (6) enabling the formation of a processed electrical signal (9),
    at least one secondary sound reproduction source (8) converting said processed electrical signal (9) into a secondary sound signal capable of attenuating said resonances to obtain a corrected sound signal, characterised in that:
    the means for measuring the perturbed sound signal (15) are distributed in several measuring positions (5) predetermined in the acoustic space (1) so as to measure resonance amplitudes close to those of the resonances perturbing the reproduction of the primary sound signal in the listening zone (27),
    the secondary sound reproduction sources (8) converting said processed electric signal (9) in a secondary sound signal are distributed in several correcting positions (17) predetermined in the acoustic space so as to act in reverse direction on said resonances enabling to obtain a homogeneous corrected sound signal in the listening zone (27),
    the means for attenuating the resonances is couple with a means for processing the signal to be reproduced (3) so as to enable the generation of a modified sound signal capable of minimising the formation of resonances,
    the means for processing the electrical signal (6) includes at least one signal controlling means (7) connected to each means for measuring the perturbed sound signal (15).
  6. A device for acoustic correction according to claim 5, characterised in that the processing of the signal to be reproduced (3) is a means for processing the signal by equalization.
  7. A device for acoustic correction according to claim 5 or 6, characterised in that the means for attenuating the resonances and the means for processing the signal to be reproduced (3) use the signal to be reproduced as a reference (31).
  8. A device for acoustic correction according to claim 7, characterised in that the signal controlling means (7) comprises a means for allocating coefficients (10) weighting said coefficients according to the measuring position (5).
  9. A device for acoustic correction according to claim 7 or 8, characterised in that each signal controlling means (7) includes a path (16) connect to a single secondary sound reproduction source (8), said secondary sound reproduction source (8) converting the processed electrical signal (9) in a secondary sound signal attenuating at least one resonance.
  10. A device for acoustic correction according to anyone of claims 7 to 9, characterised in that the signal controlling means (7) comprises a control filter (13).
  11. A for acoustic correction according to claim 10, characterised in that the control filter (13) is an adaptive filter.
  12. A for acoustic correction according to anyone of claims 5 so 11, characterised in that the means for measuring the perturbed sound signal (15) are arranged in the listening zone (27).
  13. A device for acoustic correction according to anyone of claims 5 to 12, characterised in that the means for measuring the perturbed sound signal (15) are arranged at the periphery of the acoustic space (1).
EP06808279A 2005-09-05 2006-09-04 Method and device for actively correcting acoustic properties of an acoustic space listening zone Not-in-force EP1941491B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0552676A FR2890480B1 (en) 2005-09-05 2005-09-05 METHOD AND DEVICE FOR ACTIVE CORRECTION OF THE ACOUSTIC PROPERTIES OF A LISTENING AREA OF A SOUND SPACE
PCT/FR2006/050840 WO2007028922A1 (en) 2005-09-05 2006-09-04 Method and device for actively correcting acoustic properties of an acoustic space listening zone

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EP1941491A1 EP1941491A1 (en) 2008-07-09
EP1941491B1 true EP1941491B1 (en) 2013-01-02

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EP (1) EP1941491B1 (en)
JP (1) JP5020243B2 (en)
CA (1) CA2621553C (en)
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WO (1) WO2007028922A1 (en)

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JP5262324B2 (en) * 2008-06-11 2013-08-14 ヤマハ株式会社 Speech synthesis apparatus and program
FR2984064B1 (en) 2011-12-13 2016-07-22 Anagram Acoustics SOUND REPRODUCTION DEVICE AND METHOD FOR LOW FREQUENCIES
CN113554998B (en) * 2020-04-24 2023-11-10 广东美的白色家电技术创新中心有限公司 Active noise reduction device, indoor electrical system and active noise reduction method

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Publication number Priority date Publication date Assignee Title
US4122303A (en) * 1976-12-10 1978-10-24 Sound Attenuators Limited Improvements in and relating to active sound attenuation
JPH0195699A (en) * 1987-10-08 1989-04-13 Ono Sokki Co Ltd Sound pressure control system
NL8800745A (en) * 1988-03-24 1989-10-16 Augustinus Johannes Berkhout METHOD AND APPARATUS FOR CREATING A VARIABLE ACOUSTICS IN A ROOM
ATE120328T1 (en) * 1988-07-08 1995-04-15 Adaptive Audio Ltd SOUND REPRODUCTION SYSTEMS.
JPH02150197A (en) * 1988-11-30 1990-06-08 Onkyo Corp Standing wave suppressing device
US4899387A (en) * 1988-12-02 1990-02-06 Threshold Corporation Active low frequency acoustic resonance suppressor
US5537479A (en) * 1994-04-29 1996-07-16 Miller And Kreisel Sound Corp. Dual-driver bass speaker with acoustic reduction of out-of-phase and electronic reduction of in-phase distortion harmonics
JP3421146B2 (en) * 1994-10-28 2003-06-30 アルパイン株式会社 Sound field control method and device
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FI981409A (en) * 1998-06-17 1999-12-18 Genelec Oy Method and apparatus for reducing acoustic reflection in a room
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US7715575B1 (en) * 2005-02-28 2010-05-11 Texas Instruments Incorporated Room impulse response

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US20080247552A1 (en) 2008-10-09
CA2621553A1 (en) 2007-03-15
FR2890480B1 (en) 2008-03-14
US8059822B2 (en) 2011-11-15
JP2009507254A (en) 2009-02-19
EP1941491A1 (en) 2008-07-09
WO2007028922A1 (en) 2007-03-15
FR2890480A1 (en) 2007-03-09
CA2621553C (en) 2014-01-07
JP5020243B2 (en) 2012-09-05

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