DE69319783D1 - Geräuschminderungssystem - Google Patents

Geräuschminderungssystem

Info

Publication number
DE69319783D1
DE69319783D1 DE69319783T DE69319783T DE69319783D1 DE 69319783 D1 DE69319783 D1 DE 69319783D1 DE 69319783 T DE69319783 T DE 69319783T DE 69319783 T DE69319783 T DE 69319783T DE 69319783 D1 DE69319783 D1 DE 69319783D1
Authority
DE
Germany
Prior art keywords
noise reduction
reduction system
noise
reduction
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Fee Related
Application number
DE69319783T
Other languages
English (en)
Other versions
DE69319783T2 (de
Inventor
Yi Yuan
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Motors Liquidation Co
Original Assignee
Motors Liquidation Co
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 Motors Liquidation Co filed Critical Motors Liquidation Co
Publication of DE69319783D1 publication Critical patent/DE69319783D1/de
Application granted granted Critical
Publication of DE69319783T2 publication Critical patent/DE69319783T2/de
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
    • F16L55/02—Energy absorbers; Noise absorbers
    • F16L55/033—Noise absorbers
    • F16L55/0333—Noise absorbers by means of an active system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/06—Silencing apparatus characterised by method of silencing by using interference effect
    • F01N1/065—Silencing apparatus characterised by method of silencing by using interference effect by using an active noise source, e.g. speakers
    • 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
    • G10K11/1781—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
    • G10K11/1785—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
    • G10K11/17857—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
    • G10K11/17883—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
    • G10K2210/10—Applications
    • G10K2210/121—Rotating machines, e.g. engines, turbines, motors; Periodic or quasi-periodic signals in general
    • 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
    • G10K2210/128—Vehicles
    • G10K2210/1282—Automobiles
    • 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
    • G10K2210/3032—Harmonics or sub-harmonics
    • 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
    • G10K2210/3039—Nonlinear, e.g. clipping, numerical truncation, thresholding or variable input and output gain
    • 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
    • G10K2210/3046—Multiple acoustic inputs, multiple acoustic outputs
    • 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
    • G10K2210/50—Miscellaneous
    • G10K2210/501—Acceleration, e.g. for accelerometers

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Exhaust Silencers (AREA)
DE69319783T 1992-04-29 1993-04-05 Geräuschminderungssystem Expired - Fee Related DE69319783T2 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US07/875,893 US5222148A (en) 1992-04-29 1992-04-29 Active noise control system for attenuating engine generated noise

Publications (2)

Publication Number Publication Date
DE69319783D1 true DE69319783D1 (de) 1998-08-27
DE69319783T2 DE69319783T2 (de) 1998-11-26

Family

ID=25366558

Family Applications (1)

Application Number Title Priority Date Filing Date
DE69319783T Expired - Fee Related DE69319783T2 (de) 1992-04-29 1993-04-05 Geräuschminderungssystem

Country Status (3)

Country Link
US (1) US5222148A (de)
EP (1) EP0568129B1 (de)
DE (1) DE69319783T2 (de)

Families Citing this family (54)

* Cited by examiner, † Cited by third party
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US5457749A (en) * 1990-04-09 1995-10-10 Noise Cancellation Technologies, Inc. Electronic muffler
US5386472A (en) * 1990-08-10 1995-01-31 General Motors Corporation Active noise control system
EP0778559B1 (de) * 1992-03-12 2001-08-08 Honda Giken Kogyo Kabushiki Kaisha Schwingungs- und Geräuschregelungssystem für Kraftfahrzeuge
US5402496A (en) * 1992-07-13 1995-03-28 Minnesota Mining And Manufacturing Company Auditory prosthesis, noise suppression apparatus and feedback suppression apparatus having focused adaptive filtering
US5410606A (en) * 1992-07-21 1995-04-25 Honda Giken Kogyo Kabushiki Kaisha Noise canceling method
JPH06230788A (ja) * 1993-02-01 1994-08-19 Fuji Heavy Ind Ltd 車室内騒音低減装置
WO1994027525A1 (en) * 1993-05-21 1994-12-08 Noise Cancellation Technologies, Inc. Active ear defender
DE4334942A1 (de) * 1993-10-13 1995-04-20 Bayerische Motoren Werke Ag Vorrichtung zur aktiven akustischen Schallkompensation in Hohlräumen eines Kraftfahrzeuges
US5473698A (en) * 1993-11-23 1995-12-05 Garnjost; Kenneth D. Method of controlling the application of counter-vibration to a structure
US5502770A (en) * 1993-11-29 1996-03-26 Caterpillar Inc. Indirectly sensed signal processing in active periodic acoustic noise cancellation
JP3099217B2 (ja) * 1994-04-28 2000-10-16 株式会社ユニシアジェックス 自動車用アクティブ騒音制御装置
FR2723464B1 (fr) * 1994-08-05 1996-10-11 Matra Cap Systems Sa Procede et dispositif d'amortissement actif d'ondes mecaniques
FR2724467B1 (fr) * 1994-09-09 1996-11-22 Matra Cap Systems Sa Procede et dispositif d'amortissement actif d'ondes mecaniques a capteurs deportes
JP3434830B2 (ja) * 1994-10-13 2003-08-11 ザ・ボーイング・カンパニー ジェットエンジンのための騒音低減システムおよび騒音制御方法
US5479823A (en) * 1994-11-03 1996-01-02 Chrysler Corporation Method and apparatus for inducing audio vibrations
US5710822A (en) * 1995-11-07 1998-01-20 Digisonix, Inc. Frequency selective active adaptive control system
US6496581B1 (en) * 1997-09-11 2002-12-17 Digisonix, Inc. Coupled acoustic echo cancellation system
ATE226684T1 (de) * 1998-07-22 2002-11-15 Friedmund Nagel Vorrichtung und verfahren zur reduzierung der schallemission bei verbrennungsmotoren und zu deren diagnose
DE19832979C1 (de) 1998-07-22 1999-11-04 Friedmund Nagel Vorrichtung und Verfahren zur Reduzierung der Schallemission bei Verbrennungsmotoren
FR2783563B1 (fr) * 1998-09-23 2000-12-15 Ecia Equip Composants Ind Auto Systeme anti-bruit pour ligne d'echappement de vehicule automobile
US6865466B2 (en) * 2000-04-27 2005-03-08 American Axle & Manufacturing, Inc. Active vibration cancellation of gear mesh vibration
US6549629B2 (en) 2001-02-21 2003-04-15 Digisonix Llc DVE system with normalized selection
US20030016833A1 (en) * 2001-07-19 2003-01-23 Siemens Vdo Automotive, Inc. Active noise cancellation system utilizing a signal delay to accommodate noise phase change
ES2592262T3 (es) * 2003-08-04 2016-11-29 Carefusion 203, Inc. Sistema de respirador portátil
US7527053B2 (en) * 2003-08-04 2009-05-05 Cardinal Health 203, Inc. Method and apparatus for attenuating compressor noise
US8156937B2 (en) * 2003-08-04 2012-04-17 Carefusion 203, Inc. Portable ventilator system
US7607437B2 (en) 2003-08-04 2009-10-27 Cardinal Health 203, Inc. Compressor control system and method for a portable ventilator
US8118024B2 (en) 2003-08-04 2012-02-21 Carefusion 203, Inc. Mechanical ventilation system utilizing bias valve
US8300842B2 (en) * 2004-05-21 2012-10-30 Mahle International Gmbh Robust system for sound enhancement from a single engine sensor
JP4341608B2 (ja) * 2005-11-01 2009-10-07 トヨタ自動車株式会社 エンジン音制御装置
US20070297619A1 (en) * 2006-06-26 2007-12-27 Bose Corporation*Ewc* Active noise reduction engine speed determining
US8194873B2 (en) * 2006-06-26 2012-06-05 Davis Pan Active noise reduction adaptive filter leakage adjusting
US7752040B2 (en) * 2007-03-28 2010-07-06 Microsoft Corporation Stationary-tones interference cancellation
US7997885B2 (en) * 2007-12-03 2011-08-16 Carefusion 303, Inc. Roots-type blower reduced acoustic signature method and apparatus
US8204242B2 (en) * 2008-02-29 2012-06-19 Bose Corporation Active noise reduction adaptive filter leakage adjusting
US8888711B2 (en) * 2008-04-08 2014-11-18 Carefusion 203, Inc. Flow sensor
EP2110523A1 (de) * 2008-04-16 2009-10-21 Robert Bosch GmbH Vorrichtung und Verfahren zur aktiven Lärmbekämpfung im Abgaskanal eines Verbrennungsmotors
US8355512B2 (en) * 2008-10-20 2013-01-15 Bose Corporation Active noise reduction adaptive filter leakage adjusting
US8306240B2 (en) * 2008-10-20 2012-11-06 Bose Corporation Active noise reduction adaptive filter adaptation rate adjusting
EP2425640B1 (de) * 2009-05-01 2018-08-15 Bose Corporation Mehrelementige elektroakustische wandlung
DE102009032600A1 (de) * 2009-07-10 2011-01-13 GM Global Technology Operations, Inc., Detroit Verfahren zur geräuschmindernden Steuerung einer Heiz-, Belüftungs- und/oder Klimaanlage eines Kraftfahrzeugs
DE102012200712B4 (de) * 2012-01-19 2015-07-09 Eberspächer Exhaust Technology GmbH & Co. KG Abgasvorrichtung für eine Brennkraftmaschine
US9286882B1 (en) 2012-03-07 2016-03-15 Great Lakes Sound & Vibration, Inc. Systems and methods for active exhaust noise cancellation
US9269344B2 (en) * 2013-09-03 2016-02-23 Bose Corporation Engine harmonic cancellation system afterglow mitigation
DE102014113940A1 (de) * 2014-09-25 2016-03-31 Eberspächer Exhaust Technology GmbH & Co. KG Überlastungsschutz für einen Aktor eines Systems zur Beeinflussung von in einer Abgasanlage geführtem Schall
CN107407170B (zh) * 2014-12-19 2020-07-17 通用电气公司 主动噪音控制系统
GB2535731B (en) * 2015-02-25 2019-05-08 Jaguar Land Rover Ltd Active noise control for vehicles
WO2018073626A1 (en) * 2016-10-20 2018-04-26 Harman Becker Automotive Systems Gmbh Noise control
US10176793B2 (en) 2017-02-14 2019-01-08 Mediatek Inc. Method, active noise control circuit, and portable electronic device for adaptively performing active noise control operation upon target zone
CN108386280B (zh) * 2018-02-06 2020-05-19 浙江吉利新能源商用车有限公司 一种用于车辆的降噪方法、降噪系统及车辆
CN114128310B (zh) * 2019-05-16 2024-10-18 伯斯有限公司 使用麦克风投射消除声音
US20210001769A1 (en) * 2019-07-01 2021-01-07 Harman International Industries, Incorporated Drive mode optimized engine order cancellation
CN112037812B (zh) * 2020-09-01 2021-06-15 深圳爱卓软科技有限公司 音频处理方法
US11183166B1 (en) * 2020-11-06 2021-11-23 Harman International Industries, Incorporated Virtual location noise signal estimation for engine order cancellation

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JPS599699A (ja) * 1982-07-07 1984-01-19 日産自動車株式会社 自動車の車室内音場制御装置
US4565940A (en) * 1984-08-14 1986-01-21 Massachusetts Institute Of Technology Method and apparatus using a piezoelectric film for active control of vibrations
GB2203016A (en) * 1986-10-07 1988-10-05 Adaptive Control Ltd Active sound control apparatus
US4805733A (en) * 1987-07-07 1989-02-21 Nippondenso Co., Ltd. Active silencer
US5097923A (en) * 1988-02-19 1992-03-24 Noise Cancellation Technologies, Inc. Active sound attenation system for engine exhaust systems and the like
US4878188A (en) * 1988-08-30 1989-10-31 Noise Cancellation Tech Selective active cancellation system for repetitive phenomena
US5022082A (en) * 1990-01-12 1991-06-04 Nelson Industries, Inc. Active acoustic attenuation system with reduced convergence time
US5010576A (en) * 1990-01-22 1991-04-23 Westinghouse Electric Corp. Active acoustic attenuation system for reducing tonal noise in rotating equipment
US5063598A (en) * 1990-04-25 1991-11-05 Ford Motor Company Active noise control system with two stage conditioning
EP0470656A1 (de) * 1990-08-10 1992-02-12 General Motors Corporation Verfahren und Einrichtung zur Dämpfung von Motorgeräusch
US5146505A (en) * 1990-10-04 1992-09-08 General Motors Corporation Method for actively attenuating engine generated noise

Also Published As

Publication number Publication date
US5222148A (en) 1993-06-22
EP0568129A2 (de) 1993-11-03
EP0568129B1 (de) 1998-07-22
DE69319783T2 (de) 1998-11-26
EP0568129A3 (de) 1994-08-31

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Legal Events

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8364 No opposition during term of opposition
8339 Ceased/non-payment of the annual fee