EP1074971B1 - Système de contrôle actif du bruit à correction aval - Google Patents

Système de contrôle actif du bruit à correction aval Download PDF

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Publication number
EP1074971B1
EP1074971B1 EP00122368A EP00122368A EP1074971B1 EP 1074971 B1 EP1074971 B1 EP 1074971B1 EP 00122368 A EP00122368 A EP 00122368A EP 00122368 A EP00122368 A EP 00122368A EP 1074971 B1 EP1074971 B1 EP 1074971B1
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Prior art keywords
signal
error
antinoise
signals
reference signal
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Expired - Lifetime
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EP00122368A
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German (de)
English (en)
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EP1074971A2 (fr
EP1074971A3 (fr
Inventor
Jianhua Pan
Anthony J. Brammer
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National Research Council of Canada
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National Research Council of Canada
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Priority claimed from EP96920661A external-priority patent/EP0836736B1/fr
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    • 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
    • G10K11/1781—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 characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions
    • G10K11/17821—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 characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions characterised by the analysis of the input signals only
    • G10K11/17825—Error signals
    • 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
    • G10K11/1781—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 characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions
    • G10K11/17813—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 characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions characterised by the analysis of the acoustic paths, e.g. estimating, calibrating or testing of transfer functions or cross-terms
    • G10K11/17817—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 characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions characterised by the analysis of the acoustic paths, e.g. estimating, calibrating or testing of transfer functions or cross-terms between the output signals and the error signals, i.e. secondary path
    • 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
    • G10K11/1781—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 characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions
    • G10K11/17821—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 characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions characterised by the analysis of the input signals only
    • G10K11/17823—Reference signals, e.g. ambient acoustic environment
    • 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
    • G10K11/17854—Methods, e.g. algorithms; Devices of the filter the filter being an adaptive 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
    • G10K11/1785—Methods, e.g. algorithms; Devices
    • G10K11/17855—Methods, e.g. algorithms; Devices for improving speed or power requirements
    • 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
    • G10K11/17857—Geometric disposition, e.g. placement of microphones
    • 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
    • G10K11/17879—General system configurations using both a reference signal and an error signal
    • G10K11/17881—General system configurations using both a reference signal and an error signal the reference signal being an acoustic signal, e.g. recorded with a 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
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/10—Applications
    • G10K2210/108—Communication systems, e.g. where useful sound is kept and noise is cancelled
    • G10K2210/1081—Earphones, e.g. for telephones, ear protectors or headsets
    • 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
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/30—Means
    • G10K2210/301—Computational
    • G10K2210/3027—Feedforward
    • 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
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/30—Means
    • G10K2210/301—Computational
    • G10K2210/3053—Speeding up computation or convergence, or decreasing the computational load
    • 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
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/30—Means
    • G10K2210/321—Physical
    • G10K2210/3213—Automatic gain control [AGC]

Definitions

  • This invention relates to the field of sound controllers, and in particular to an adaptive feedforward active noise control method.
  • the signal derived from H 1 ( ⁇ ) is applied to an adaptive FIR filter W, which applies an antinoise signal via transfer function H 2 to a summer ⁇ , to which the acoustic signal to be controlled is also applied.
  • the summer is actually the cavity in front of and in the region of the transducer 7 within the duct 1, while in the system of Figure 4, the summer is the region within the cup 11 particularly between the earphone 19 and the ear canal 17.
  • the antinoise signal from H 2 output from FIR filter W passing via transfer functions H 2 (and H a in Figure 4), is added to the acoustic signal so as to cancel it.
  • the output signals of A/D converters 25A and 25B are subjected to an interface delay 27A and 27B, and from the interface delays the signals are filtered in decimation filters 29A and 29B.
  • the interface delays 27A, 27B and 39 are dependent on the hardware implementations of the active noise control system, which is taken to include any phase delay in the low pass filters 23A, 23B and 43, and is commonly related to the sampling time interval.
  • a variable, reciprocal gain and fixed-ratio gain arrangement can be made by means of linear amplifiers having automatic gain control signal paths, as for example channels 1, 2 and 3 illustrated in Figure 11.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)

Claims (12)

  1. Procédé de régulation de bruit pour un signal acoustique, comprenant les opérations suivantes :
    (a) obtenir un signal de référence du signal acoustique à réguler,
    (b) appliquer un signal d'anti-bruit (ou bruit annulant) au signal acoustique afin de réguler le signal acoustique,
    (c) obtenir un signal d'erreur en résultat de l'application du signal d'anti-bruit au signal acoustique,
    (d) produire ledit signal d'antlbruit à partir dudit signal de référence en faisant passer le signal de référence dans un premier filtre dont les coefficients sont ajustables,
    (e) ajuster les coefficients du filtre en traitant le signal d'erreur et une représentation modifiée du signal de référence et produire un signal d'ajustement de coefficients de façon à produire le signal d'anti-bruit,
    (f) appliquer le signal d'ajustement des coefficients au premier filtre, et
    (g) suréchantillonner le signal de référence et le signal d'erreur et ajuster les coefficients du premier filtre, puis produire le signal d'anti-bruit, en ne traitant qu'une fraction décimée des échantillons suréchantillonnés des signaux de référence et d'erreur, ladite fraction étant d'un quart ou moins, et en appliquant ledit signal d'anti-bruit au signal acoustique à la fréquence dudit suréchantillonnage.
  2. Procédé selon la revendication 1, comportant l'utilisation d'un modèle à réponse impulsionnelle finie, noté modèle FIR, d'un trajet de signal qui part de l'emplacement du signal d'anti-bruit pour aller à l'emplacement du signal d'erreur, afin d'obtenir ladite représentation modifiée du signal de référence, dans lequel modèle les coefficients de filter hl satisfont la condition :
    Figure 00210001
       où i=1, 2, 3, ... N, et où N est le nombre total de coefficients de filtre.
  3. Procédé selon la revendication 2, comportant l'utilisation d'un modèle simplifié d'un trajet de signal qui part de l'emplacement du signal d'anti-bruit pour aller à l'emplacement du signal d'erreur afin d'obtenir ladite représentation modifiée du signal de référence.
  4. Procédé selon la revendication 2, où le modèle à réponse impulsionnelle du trajet d'erreur est tronqué.
  5. Procédé selon la revendication 2, où le modèle à réponse impulsionnelle du trajet d'erreur est synthétisé.
  6. Procédé selon la revendication 1, comportant une conformation de fréquence analogique d'ordre Inférieur d'au moins un signal pris entre le signal de référence et le signal d'erreur avant le traitement, et du signal d'anti-bruit après le traitement.
  7. Procédé selon la revendication 6, comportant une conformation de fréquence analogique d'ordre inférieur qui utilise des filtres acoustiques passe-bas d'ordre inférieur.
  8. Procédé selon la revendication 1, comportant l'opération qui consiste à faire varier le gain des trajets du signal de référence (X), du signal d'anti-bruit (U) et du signal d'erreur (E) de façon que l'impulsion du trajet d'erreur reste inchangée.
  9. Procédé selon la revendication 8, comportant l'opération qui consiste à faire varier le gain des trajets du signal de référence (X), du signal d'anti-bruit (U) et du signal d'erreur (E) de façon que le rapport des gains des signaux X/E reste inchangé.
  10. Procédé selon la revendication 8, comportant l'opération qui consiste à faire varier le gain des trajets du signal de référence (X), du signal d'anti-bruit (U) et du signal d'erreur (E) de façon que le produit des gains des signaux E et U reste inchangé.
  11. Procédé selon la revendication 1, comportant l'opération qui consiste à faire varier le gain des trajets du signal de référence (X), du signal d'anti-bruit (U) et du signal d'erreur (E) de façon que le produit des gains des signaux E et U et le rapport des gains des signaux X/E restent inchangés.
  12. Procédé selon la revendication 1, où la fréquence de suréchantillonnage est d'environ 40 kHz ou moins.
EP00122368A 1995-07-03 1996-07-02 Système de contrôle actif du bruit à correction aval Expired - Lifetime EP1074971B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US83495P 1995-07-03 1995-07-03
US834P 1995-07-03
EP96920661A EP0836736B1 (fr) 1995-07-03 1996-07-02 Systeme actif et numerique de reduction du bruit par amont

Related Parent Applications (1)

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EP96920661A Division EP0836736B1 (fr) 1995-07-03 1996-07-02 Systeme actif et numerique de reduction du bruit par amont

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EP1074971A2 EP1074971A2 (fr) 2001-02-07
EP1074971A3 EP1074971A3 (fr) 2001-05-09
EP1074971B1 true EP1074971B1 (fr) 2003-04-09

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EP00122367A Expired - Lifetime EP1074970B1 (fr) 1995-07-03 1996-07-02 Système de contrôle actif du bruit à correction aval

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Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2446966B (en) 2006-04-12 2010-07-07 Wolfson Microelectronics Plc Digital circuit arrangements for ambient noise-reduction
GB2465681B (en) * 2006-04-12 2010-12-15 Wolfson Microelectronics Plc Digital circuit arrangements for ambient noise-reduction
JP2008122729A (ja) 2006-11-14 2008-05-29 Sony Corp ノイズ低減装置、ノイズ低減方法、ノイズ低減プログラムおよびノイズ低減音声出力装置
GB2441835B (en) * 2007-02-07 2008-08-20 Sonaptic Ltd Ambient noise reduction system
US8737636B2 (en) 2009-07-10 2014-05-27 Qualcomm Incorporated Systems, methods, apparatus, and computer-readable media for adaptive active noise cancellation
US9082389B2 (en) * 2012-03-30 2015-07-14 Apple Inc. Pre-shaping series filter for active noise cancellation adaptive filter
GB2582373B (en) 2019-03-22 2021-08-11 Dyson Technology Ltd Noise control
GB2582374B (en) * 2019-03-22 2021-08-18 Dyson Technology Ltd Noise control
CN113421540B (zh) * 2021-07-26 2023-10-31 北京安声浩朗科技有限公司 主动降噪方法、主动降噪装置及半入耳式主动降噪耳机

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GB8504541D0 (en) * 1985-02-21 1985-03-27 Plessey Co Plc Noise reduction arrangements
JP2598483B2 (ja) * 1988-09-05 1997-04-09 日立プラント建設株式会社 電子消音システム
US5117401A (en) * 1990-08-16 1992-05-26 Hughes Aircraft Company Active adaptive noise canceller without training mode
US5267320A (en) * 1991-03-12 1993-11-30 Ricoh Company, Ltd. Noise controller which noise-controls movable point
JP3471370B2 (ja) * 1991-07-05 2003-12-02 本田技研工業株式会社 能動振動制御装置
US5311453A (en) * 1992-09-11 1994-05-10 Noise Cancellation Technologies, Inc. Variable point sampling
US5548543A (en) * 1994-12-08 1996-08-20 Stanford University Computationally efficient linear-phase finite impulse response filter

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Publication number Publication date
EP1074970B1 (fr) 2003-04-23
EP1074971A2 (fr) 2001-02-07
EP1074971A3 (fr) 2001-05-09
EP1074970A2 (fr) 2001-02-07
EP1074970A3 (fr) 2001-05-09

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