EP1074971B1 - Digitales vorwärtsgeregeltes System für aktive Lärmkontrolle - Google Patents

Digitales vorwärtsgeregeltes System für aktive Lärmkontrolle Download PDF

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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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English (en)
French (fr)
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EP1074971A2 (de
EP1074971A3 (de
Inventor
Jianhua Pan
Anthony J. Brammer
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National Research Council of Canada
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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. Verfahren zur Lärmsteuerung eines akustischen Signals, mit den folgenden Schritten:
    (a) Gewinnen eines Referenzsignals von dem zu steuernden akustischen Signal,
    (b) Anwenden eines Gegengeräuschsignals auf das akustische Signal, um das akustische Signal zu steuern,
    (c) Gewinnen eines Fehlersignals, das von der Anwendung des Gegengeräuschsignals auf das akustische Signal herrührt,
    (d) Erzeugen des Gegengeräuschsignals aus dem Referenzsignal, indem das Referenzsignal durch einen ersten Filter mit steuerbaren Filterkoeffizienten läuft,
    (e) Steuern der Filterkoeffizienten durch verarbeiten des Fehlersignals und einer geänderten Darstellung des Referenzsignals sowie Erzeugen eines Koeffizientensteuersignals, um das Gegengeräuschsignal zu generieren,
    (f) Anwenden des Koeffizientensteuersignals auf den ersten Filter und
    (g) Abtasten der Referenz und Fehlersignale sowie Steuern der Koeffizienten des ersten Filters, Erzeugen des Gegengeräuschsignals durch Verarbeitung lediglich eines dezimierten Anteils der abgetasteten Signale von Referenz und Fehlersignalen, wobei der Anteil ein Viertel oder weniger ist, und Anlegen des Gegengeräuschsignals an das akustische Signal mit der Abtastrate.
  2. Verfahren nach Anspruch 1, das ein FIR-Modell eines Signalpfads von einer Stelle des Gegengeräuschsignals zu einer Stelle des Fehlersignals verwendet, um die geänderte Darstellung des Referenzsignals zu erhalten, wobei in dem Modell die Filterkoeffizienten h; die folgende Bedingung erfüllen:
    Figure 00190001
       wobei i = 1, 2, 3, ...N und N die Gesamtanzahl der Filterkoeffizienten bezeichnet.
  3. Verfahren nach Anspruch 2, das ein vereinfachtes Modell für einen Signalpfad von einem Ort des Gegengeräuschsignals zu einem Ort des Fehlersignals aufweist, um die geänderte Darstellung für das Referenzsignal zu erhalten.
  4. Verfahren nach Anspruch 2, bei dem das Impulsantwortmodell des Fehlerpfads abgeschnitten ist.
  5. Verfahren nach Anspruch 2, bei dem das Impulsantwortmodell des Fehlerpfads synthetisiert ist.
  6. Verfahren nach Anspruch 1, bei dem eine analoge Frequenzumformung mindestens eines von beiden einschließt: das Referenzsignal sowie das Fehlersignal vor der Verarbeitung und das Gegengeräuschsignal nach der Verarbeitung.
  7. Verfahren nach Anspruch 6, bei dem eine analoge Frequenzumformung niedriger Ordnung unter Verwendung von akustischen Tiefpaßfiltern niedriger Ordnung erfolgt.
  8. Verfahren nach Anspruch 1, das eine Veränderung der Verstärkung der Pfade des Referenzsignals (X), des Gegengeräuschsignals (U) und des Fehlersignals (E) aufweist, derart, daß der Fehlerpfadimpuls unverändert bleibt.
  9. Verfahren nach Anspruch 8, das eine Änderung der Verstärkung der Pfade des Referenzsignals (X), des Gegengeräuschsignals (U) und des Fehlersignals (E) aufweist, derart, daß das Verstärkungsverhältnis der Signale X/E unverändert bleibt.
  10. Verfahren nach Anspruch 8, das eine Änderung der Verstärkung der Pfade des Referenzsignals (X), des Gegengeräuschsignals (U) und des Fehlersignals (E) aufweist, derart, daß das Produkt der Verstärkung der Signale E und U konstant bleibt.
  11. Verfahren nach Anspruch 1, das eine Änderung der Verstärkung der Pfade des Referenzsignals (X), des Gegengeräuschsignals (U) und des Fehlersignals (E) aufweist, derart, daß das Produkt der Verstärkungen der Signale E und U sowie das Verstärkungsverhältnis für Signal X/E konstant bleiben.
  12. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Abtastfrequenz ungefähr 40 kHz oder weniger beträgt.
EP00122368A 1995-07-03 1996-07-02 Digitales vorwärtsgeregeltes System für aktive Lärmkontrolle Expired - Lifetime EP1074971B1 (de)

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US83495P 1995-07-03 1995-07-03
US834P 1995-07-03
EP96920661A EP0836736B1 (de) 1995-07-03 1996-07-02 Digitales vorwärtsgeregeltes system für aktive lärmkontrolle

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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
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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EP1074970B1 (de) 2003-04-23
EP1074971A3 (de) 2001-05-09
EP1074970A3 (de) 2001-05-09
EP1074970A2 (de) 2001-02-07

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