WO2008029336A1 - Système et procédé de traitement de signal - Google Patents

Système et procédé de traitement de signal Download PDF

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Publication number
WO2008029336A1
WO2008029336A1 PCT/IB2007/053531 IB2007053531W WO2008029336A1 WO 2008029336 A1 WO2008029336 A1 WO 2008029336A1 IB 2007053531 W IB2007053531 W IB 2007053531W WO 2008029336 A1 WO2008029336 A1 WO 2008029336A1
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WO
WIPO (PCT)
Prior art keywords
filter
microphone
loudspeaker
output
function
Prior art date
Application number
PCT/IB2007/053531
Other languages
English (en)
Inventor
Sebastiaan De Bont
Cornelis P. Janse
Original Assignee
Koninklijke Philips Electronics N.V.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Koninklijke Philips Electronics N.V. filed Critical Koninklijke Philips Electronics N.V.
Publication of WO2008029336A1 publication Critical patent/WO2008029336A1/fr

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Classifications

    • 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
    • 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
    • G10K11/1787—General system configurations
    • G10K11/17879—General system configurations using both a reference signal and an error signal
    • 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
    • G10K11/17883—General system configurations using both a reference signal and an error signal the reference signal being derived from a machine operating condition, e.g. engine RPM or vehicle speed
    • 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
    • G10K2210/3226—Sensor details, e.g. for producing a reference or error signal

Definitions

  • This invention relates to a signal processing system and to a method of operating the signal processing system.
  • the signal processing system is particularly suitable for use in an active noise cancellation system, for example in a vehicle.
  • the noise from the engine and from the road can be a discomfort to the driver and to the passengers in the vehicle.
  • the noise that is present can also have a safety implication, if the driver is distracted while they are driving or fails to hear the approach of another vehicle or the presence of a warning signal from another vehicle.
  • One possible solution to this problem is the use of active noise cancellation.
  • ANC active noise cancellation
  • Figure 1 illustrates this well known feed- forward ANC structure using the FX- LMS.
  • the engine noise (primary wave field) produced during operation travels through the car (modeled by the transfer function P) and arrives at the driver's ears. Close to the driver's ears, the error microphone (M em ) picks up this noise (besides the actively produced secondary wave field) and the detected signal is used to adapt the filters of the FX-LMS algorithm.
  • the LMS update rule also receives a filtered version of the reference signal.
  • the reference signal is a multi-tonal reference, synthesized from a tacho signal that shows a high coherence with the engine noise.
  • This reference signal is filtered by an estimate of the secondary path before entering the LMS updating part.
  • the secondary path (H em ) is the acoustical path from the secondary noise source (the loudspeaker) to the error microphone.
  • the estimation of the secondary path is critical. Usually, this estimation is done in advance (off-line) and during operation the secondary path estimation is allowed to slowly adapt along changes in the environment.
  • Loudspeaker control means for controlling the input to the loudspeaker operate to energize the loudspeaker such that the sound waves emitted by the loudspeaker substantially cancel the unwanted sound waves in said region.
  • the loudspeaker control means includes a signal processing means arranged to simulate a microphone output that would be obtained if that microphone, instead of being positioned closer to the loudspeaker than the user, were to be positioned in a notional position relatively close to the user. The resulting simulated or virtual microphone output is then used to control the signal fed to the loudspeaker input.
  • FIG. 2 shows a feed- forward ANC structure using the FX-LMS with the virtual microphone.
  • the error microphone there is also (temporarily) a microphone that is placed at (or very close to) the likely positions of the driver's ears.
  • the acoustic path (H vm ) from the secondary loudspeaker to this virtual microphone will be estimated.
  • this microphone is not present any more, but the estimated path (H vm ) will be used to modify the update part of the FX-LMS algorithm.
  • this this is represented by an extra signal flow branch or bridge. The result is that the sweet spot will move away from the error microphone into the direction of the driver's head, giving a better ANC effect at the ears.
  • the invention it is possible to provide a signal processing system that will provide improved active noise cancellation at a user's ear, in an environment such as a vehicle.
  • the cancellation provided by the system works on the virtual microphone idea, where the virtual microphone is estimated to be where the user's ear is located.
  • the difference in the acoustic (noise) field at the real and virtual microphones is also used (through the function C).
  • the system further comprises a third filter interposed between the adaptive filter and the loudspeaker, the third filter arranged to filter the output of the adaptive filter prior to receipt by the loudspeaker.
  • the second filter is arranged to filter according to the function H em , where, again, H em is the acoustic path from the loudspeaker to the microphone.
  • Fig. 1 is a schematic diagram of a prior art active noise cancellation system
  • Fig. 2 is a schematic diagram of a second, different, prior art active noise cancellation system
  • Fig. 3 is a schematic diagram of a first embodiment of a signal processing system for active sound control
  • Fig. 4 is a schematic diagram of a second embodiment of the signal processing system for active sound control
  • Fig. 5 is a flow diagram of a method of operating the signal processing system for active sound control.
  • FIG 3 shows a schematic diagram of a signal processing system that can be used for active sound control.
  • the system comprises a reference signal generator R arranged to output a reference signal.
  • the reference signal which should have a high coherence with the actual acoustical noise, can be a signal from any sensor (accelerometer, microphone or directly from a tachometer) or derived (synthesized) from such a signal. It is not always an audio signal.
  • the block (R) represents a reference synthesizer.
  • An adaptive filter W& is arranged to receive the output of the reference signal generator R, with a loudspeaker 12 and a first filter 14 is also arranged to receive an output of the adaptive filter Wf x .
  • the loudspeaker 12 is outputting an audio signal that will cancel the noise in the vehicle cabin at (or as near as possible) to the driver's ear.
  • the virtual microphone 22 in Figure 3 is representing the assumed position of the driver's ear.
  • the system of Figure 3 also includes a real microphone 16, which picks up the output of the loudspeaker 12, via the acoustic path H em , and the environmental noise.
  • a summer 18 is arranged to receive outputs of the microphone 16 and the first filter 14.
  • a second filter 20 is arranged to receive an output of the reference signal generator R (the reference signal), and a filter control LMS is arranged to receive outputs of the second filter 20 and the summer 18.
  • the filter control LMS is arranged to control the adaptive filter Wf x , on the basis of the inputs received from the summer 18 and the filter 20.
  • the system also further comprises a third filter C interposed between the adaptive filter W& and the loudspeaker 12, the third filter C arranged to filter the output of the adaptive filter W & prior to receipt by the loudspeaker 12.
  • the second filter 20 is arranged to filter according to the function H em , again, where H em is the acoustic path from the loudspeaker (12) to the microphone (16).
  • N vm ( ⁇ ) A wf ( ⁇ ) N em ( ⁇ ) (2)
  • the first solution (equation 12) is not of interest, because when there is no primary noise at all, it is not necessary to cancel that noise. So, in general with an extra filter C perfect cancellation can be achieved at a position different from that of the error microphone. This filter depends on the ratio of the difference in transfer function (B vm ) and the difference in wave field (A wf ), as shown by equation 13.
  • H b R W & H em + N em - M em (15)
  • H b H b , fllt R W& (19)
  • Figure 3 shows the first embodiment of the noise cancellation system, with the filter 14 working according to the equation 18 above, and the filter 20 filtering the reference signal according to an estimation of the path H em from the loudspeaker 12 to the microphone 16.
  • FIG. 4 A second embodiment of the system is shown in Figure 4.
  • the filter C is removed from the primary branch and moved to the bridge (the filter 14).
  • the bridge filter Hb,mt becomes:
  • the system will operate with two virtual microphones (one for each ear of the driver) and the system will use two loudspeakers.
  • the estimation of the virtual acoustic paths has to take place offline.
  • the path from the loudspeaker (B vm ) to the virtual microphone can be obtained using a broadband white noise signal.
  • the estimation of A w f (the ratio of the noise fields at the microphones) is more difficult.
  • This term has also to be estimated beforehand, prior to operation of the system.
  • One method of estimating this value is to sweep the tacho signal by slowly pressing the gas pedal of the car, record the tacho signal and the noise at all of the microphones.
  • the proposed method is suited for local ANC applications in car cabins.
  • the invention can also be applied to the concept of personal sound spaces and extended to broadband ANC.
  • the system supports a method for improving the performance of an Active Noise Cancelling (ANC) system by reducing the engine noise at the driver's ears.
  • ANC Active Noise Cancelling
  • the algorithm involves the concept of virtual microphones and does not rely on the assumption that the sound pressure at the microphones is equal.
  • the Active Noise Control can be an option for comfort and safety improvement within the car cabin.
  • the system provides the active suppression of engine noise at the driver's ears.
  • Figure 5 summarizes the method of operating the signal processing system of Figures 4 and 5, for the active sound control.
  • the method comprises, firstly generating (step 510) the reference signal with the generator R, which is filtered (step 512), at the adaptive filter (W & ).
  • the filtered reference signal may then pass through (step 514) a further filter C which additionally filters the reference signal with the ratio C.
  • the filtered reference signal is outputted (step 516), at the loudspeaker 12. This audio signal is received (step 518), at the real microphone 16.
  • the output of the adaptive filter Wfe is also received by the filter 14 which operates in parallel to the loudspeaker 12 and microphone 16.
  • the function of C that is used is (1-C) H em , where H em is an estimation of the acoustic path from the loudspeaker 12 to the microphone 16.
  • the function of C used is (1-C)/C H em .
  • the output of the filter 14 and the microphone 16 are combined (step 522), at the summer 18.
  • the original reference signal is also filtered (step 524), at the second filter 20, using a function based on the acoustic path H em .
  • the output of this filter 20 and of the summer 18 are received, at the filter control LMS, which controls (step 526) the adaptive filter W&.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)

Abstract

Système de traitement de signal permettant une commande de son active comprenant un générateur de signal de référence (R), un filtre adaptatif (Wfx), un haut-parleur (12) agencé pour recevoir une sortie du filtre adaptatif (Wfx), un premier filtre (14), également agencé pour recevoir une sortie du filtre adaptatif (Wfx), un microphone (16), un sommateur (18) agencé pour recevoir des sorties du microphone (16) et du premier filtre (14), un second filtre (20) agencé pour recevoir une sortie du générateur de signal de référence (R) et une commande de filtre (LMS) agencée pour recevoir des sorties du second filtre (20) et du sommateur (18), la commande de filtre (LMS) étant agencée pour commander le filtre adaptatif (Wfx). Le premier filtre (14) est agencé pour filtrer la sortie du filtre adaptatif (Wfx) selon une fonction du rapport C=Awf/Bvm, où Awf est le rapport entre un champ de bruit principal au niveau du microphone (16) et un champ de bruit principal au niveau d'un microphone virtuel (22) et Bvm est le rapport entre un chemin acoustique du haut-parleur (12) au microphone (16) et un chemin acoustique du haut-parleur (16) à un microphone virtuel (22).
PCT/IB2007/053531 2006-09-06 2007-09-03 Système et procédé de traitement de signal WO2008029336A1 (fr)

Applications Claiming Priority (2)

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EP06120239 2006-09-06
EP06120239.6 2006-09-06

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102170602A (zh) * 2010-02-25 2011-08-31 哈曼贝克自动系统股份有限公司 主动降噪系统
EP3125237A1 (fr) * 2015-07-29 2017-02-01 Harman International Industries, Incorporated Appareil d'annulation active du bruit et procédé d'amélioration de performances de la reconnaissance vocale
TWI577194B (zh) * 2015-10-22 2017-04-01 山衛科技股份有限公司 環境音源辨識系統及其環境音源辨識之方法
TWI595793B (zh) * 2015-06-25 2017-08-11 宏達國際電子股份有限公司 聲音處理裝置及方法
CN108806664A (zh) * 2018-05-03 2018-11-13 清华大学苏州汽车研究院（相城） 一种汽车车内噪声控制方法
CN109658947A (zh) * 2018-11-18 2019-04-19 南京大学 一种同步建模和控制的主动噪声控制方法
JP2020012917A (ja) * 2018-07-13 2020-01-23 アルパイン株式会社 能動型騒音制御システム及び車載オーディオシステム
WO2020142690A1 (fr) * 2019-01-04 2020-07-09 Harman International Industries, Incorporated Annulation active de bruit aérien à large bande haute fréquence
CN112151001A (zh) * 2019-06-26 2020-12-29 广州汽车集团股份有限公司 一种phev主动降噪方法及其系统
US20210350782A1 (en) * 2018-12-19 2021-11-11 Google Llc Noise Amplification Control In Adaptive Noise Cancelling Systems
RU2807021C1 (ru) * 2021-04-25 2023-11-08 Шэньчжэнь Шокз Ко., Лтд. Наушники

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US5381485A (en) * 1992-08-29 1995-01-10 Adaptive Control Limited Active sound control systems and sound reproduction systems
US5701350A (en) * 1996-06-03 1997-12-23 Digisonix, Inc. Active acoustic control in remote regions

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Title
GARCIA-BONITO J ET AL: "GENERATION OF ZONES OF QUIET USING A VIRTUAL MICROPHONE ARRANGEMENT", JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA, AIP / ACOUSTICAL SOCIETY OF AMERICA, MELVILLE, NY, US, vol. 101, no. 6, June 1997 (1997-06-01), pages 3498 - 3516, XP000696885, ISSN: 0001-4966 *

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102170602A (zh) * 2010-02-25 2011-08-31 哈曼贝克自动系统股份有限公司 主动降噪系统
EP2362381A1 (fr) * 2010-02-25 2011-08-31 Harman Becker Automotive Systems GmbH Système actif de réduction du bruit
US8903101B2 (en) 2010-02-25 2014-12-02 Harman Becker Automotive Systems Gmbh Active noise reduction system
CN106210986A (zh) * 2010-02-25 2016-12-07 哈曼贝克自动系统股份有限公司 主动降噪系统
CN106210986B (zh) * 2010-02-25 2020-06-09 哈曼贝克自动系统股份有限公司 主动降噪系统
TWI595793B (zh) * 2015-06-25 2017-08-11 宏達國際電子股份有限公司 聲音處理裝置及方法
EP3125237A1 (fr) * 2015-07-29 2017-02-01 Harman International Industries, Incorporated Appareil d'annulation active du bruit et procédé d'amélioration de performances de la reconnaissance vocale
CN106409280A (zh) * 2015-07-29 2017-02-15 哈曼国际工业有限公司 用于改进语音识别性能的有源噪声消除设备和方法
US9704509B2 (en) 2015-07-29 2017-07-11 Harman International Industries, Inc. Active noise cancellation apparatus and method for improving voice recognition performance
TWI577194B (zh) * 2015-10-22 2017-04-01 山衛科技股份有限公司 環境音源辨識系統及其環境音源辨識之方法
CN108806664A (zh) * 2018-05-03 2018-11-13 清华大学苏州汽车研究院（相城） 一种汽车车内噪声控制方法
JP2020012917A (ja) * 2018-07-13 2020-01-23 アルパイン株式会社 能動型騒音制御システム及び車載オーディオシステム
JP7083576B2 (ja) 2018-07-13 2022-06-13 アルパイン株式会社 能動型騒音制御システム及び車載オーディオシステム
CN109658947A (zh) * 2018-11-18 2019-04-19 南京大学 一种同步建模和控制的主动噪声控制方法
US20210350782A1 (en) * 2018-12-19 2021-11-11 Google Llc Noise Amplification Control In Adaptive Noise Cancelling Systems
US11763791B2 (en) * 2018-12-19 2023-09-19 Google Llc Noise amplification control in adaptive noise cancelling systems
CN113228161A (zh) * 2019-01-04 2021-08-06 哈曼国际工业有限公司 高频宽带空气传播噪声主动噪声消除
WO2020142690A1 (fr) * 2019-01-04 2020-07-09 Harman International Industries, Incorporated Annulation active de bruit aérien à large bande haute fréquence
US11670276B2 (en) 2019-01-04 2023-06-06 Harman International Industries, Incorporated High-frequency broadband airborne noise active noise cancellation
CN112151001A (zh) * 2019-06-26 2020-12-29 广州汽车集团股份有限公司 一种phev主动降噪方法及其系统
CN112151001B (zh) * 2019-06-26 2023-11-14 广州汽车集团股份有限公司 一种phev主动降噪方法及其系统
RU2807021C1 (ru) * 2021-04-25 2023-11-08 Шэньчжэнь Шокз Ко., Лтд. Наушники

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