DE4115009A1 - USE OF THE RADIO SIGNAL IN THE CALIBRATION CYCLE OF AN ACTIVE NOISE REDUCTION SYSTEM - Google Patents

USE OF THE RADIO SIGNAL IN THE CALIBRATION CYCLE OF AN ACTIVE NOISE REDUCTION SYSTEM

Info

Publication number
DE4115009A1
DE4115009A1 DE4115009A DE4115009A DE4115009A1 DE 4115009 A1 DE4115009 A1 DE 4115009A1 DE 4115009 A DE4115009 A DE 4115009A DE 4115009 A DE4115009 A DE 4115009A DE 4115009 A1 DE4115009 A1 DE 4115009A1
Authority
DE
Germany
Prior art keywords
signal
calibration
calibration cycle
cycle according
entertainment
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.)
Withdrawn
Application number
DE4115009A
Other languages
German (de)
Inventor
Bernhard Dipl Ing Lange
Steven S Langston
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.)
Adam Opel GmbH
Original Assignee
Adam Opel GmbH
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 Adam Opel GmbH filed Critical Adam Opel GmbH
Priority to DE4115009A priority Critical patent/DE4115009A1/en
Priority to EP92107482A priority patent/EP0512445B1/en
Priority to DE59209279T priority patent/DE59209279D1/en
Publication of DE4115009A1 publication Critical patent/DE4115009A1/en
Withdrawn legal-status Critical Current

Links

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
    • G10K11/17885—General system configurations additionally using a desired external signal, e.g. pass-through audio such as music or speech
    • 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
    • G10K11/1785—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
    • G10K11/17875—General system configurations using an error signal without a reference signal, e.g. pure feedback
    • 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
    • G10K2210/3023—Estimation of noise, e.g. on error signals
    • G10K2210/30232—Transfer functions, e.g. impulse response
    • 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
    • G10K2210/3045—Multiple acoustic inputs, single acoustic output
    • 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
    • G10K2210/3225—Radio or other sources used in ANC for transfer function estimation; Means to avoid interference between desired signals, e.g. from a car stereo, and the ANC 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
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/50—Miscellaneous
    • G10K2210/504—Calibration

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Health & Medical Sciences (AREA)
  • Audiology, Speech & Language Pathology (AREA)
  • General Health & Medical Sciences (AREA)
  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)

Description

Die Erfindung betrifft den Kalibrierzyklus für ein ANC-System (Active NoiSe Control System) mit mindestens einem Lautspre­ cher und mindestens einem Mikrofon.The invention relates to the calibration cycle for an ANC system (Active NoiSe Control System) with at least one loudspeaker cher and at least one microphone.

Der Kalibrierzyklus ist zur Optimierung der Systemeigenschaf­ ten notwendig. Er sollte günstigerweise ab und zu wiederholt werden. Auf diese Art und Weise wird die komplexe Übertra­ gungsfunktion zwischen Lautsprechern einerseits und Mikrofo­ nen andererseits ermittelt, die dann in einem Regelalgorith­ mus über ein adaptives Filter nachgebildet werden und das ANC-System optimal funktionsfähig machen. Man wird dies gün­ stigerweise ab und zu wiederholen, um so kein Potential in der Funktion des ANC-Systems zu verschenken, andererseits wird das damit verbundene Rauschen vom Fahrer als unangenehm empfunden, was gegen Wiederholungen des Kalibrierzyklus spricht. Wenn sich die Betriebsparameter des Fahrzeuges je­ doch ändern, ist ein neuerlicher Kalibrierzyklus notwendig und sollte die Passagiere so wenig wie möglich stören.The calibration cycle is for optimizing the system properties necessary. It should conveniently be repeated every now and then will. This way the complex transfer function between speakers on the one hand and microphone nen determined on the other hand, which then in a control algorithm must be simulated using an adaptive filter and that Make the ANC system optimally functional. This will be fine from time to time, so there is no potential in the function of the ANC system, on the other hand the associated noise is uncomfortable by the driver felt what against repetitions of the calibration cycle speaks. If the operating parameters of the vehicle change change, a new calibration cycle is necessary and should bother the passengers as little as possible.

Deshalb liegt der vorliegenden Erfindung die Aufgabe zu­ grunde, einen Kalibrierzyklus für ein ANC-System anzugeben, der ein Maximum an Komfort in der Kalibrier- und in der Be­ triebsphase bietet. Diese Aufgabe wird erfindungsgemäß da­ durch gelöst, daß das zu übertragende unkorrelierte Kali­ briersignal in Kombination mit Zusatzsignalen abgestrahlt wird und daß bei der Bestimmung der Übertragungsfunktionen von den Lautsprechern zu den Mikrofonen die Zusatzsignale rechnerisch eliminiert werden.Therefore, the present invention has the object reasons to specify a calibration cycle for an ANC system, which provides maximum comfort in calibration and in loading offers drive phase. This task is there according to the invention solved by that the uncorrelated potash to be transmitted emitted in combination with additional signals  and that in determining the transfer functions the additional signals from the speakers to the microphones be eliminated mathematically.

Weitere vorteilhafte Ausgestaltungen der Erfindung ergeben sich aus den Unteransprüchen.Further advantageous embodiments of the invention result itself from the subclaims.

Ein Ausführungsbeispiel ist in der Figur gezeigt und wird im einzelnen näher erläutert. Die Figur zeigt das Schaltbild für ein ANC-System zum Kalibrierzyklus.An embodiment is shown in the figure and is in individual explained in more detail. The figure shows the circuit diagram for an ANC system for the calibration cycle.

Der Lautsprecher 1 gibt über einen Filterverstärker 11 ein unkorreliertes akustisches Signal an das Mikrofon 2 mit nach­ geschaltetem Verstärker. Das diesem Pfad parallel geschaltete adaptive Filter 3 hat einen komplexen Frequenzgang, der aus dem Kalibrierzyklus gewonnen wird, der in dem Schaltblock Korrelation 4 zur Filtereinstellung gewonnen wird. An der Summierstelle 5 bleibt im Idealfall der Wert 0 übrig. Das System ist kalibriert. Sollte ein weiterer Fahrgast zusteigen oder andere Betriebsparameter sich ändern, ist ein neuer­ licher Kalibrierzyklus notwendig. Mit 6 ist eine Anpassung des Radiosignals an die Gegebenheiten des nachfolgenden Netz­ werkes gekennzeichnet. Dabei kann es sich um eine Pegel- oder Laufzeitanpassung handeln. In der Verknüpfungsschaltung 7, die ein Summierer oder Modulator oder Multiplexer sein kann, wird dem angepaßten Radiosignal das Rauschsignal zugeführt. Das Bezugszeichen 8 zeigt einen Summierer. Da das Eingangs­ signal 9 an der Korrelationsschaltung 4 aus im wesentlichen zwei Bestandteilen besteht, ist ihr mit 10 das angepaßte Radiosignal zur Elimination zugeführt.The loudspeaker 1 outputs an uncorrelated acoustic signal to the microphone 2 via a filter amplifier 11 with the amplifier connected downstream. The adaptive filter 3 connected in parallel to this path has a complex frequency response which is obtained from the calibration cycle which is obtained in the switching block correlation 4 for filter setting. Ideally, the value 0 remains at the summing point 5 . The system is calibrated. Should another passenger get on or other operating parameters change, a new calibration cycle is necessary. With 6 an adaptation of the radio signal to the conditions of the subsequent network is marked. This can be a level or runtime adjustment. In the logic circuit 7 , which can be a summer or modulator or multiplexer, the noise signal is fed to the adapted radio signal. Reference numeral 8 shows a summer. Since the input signal 9 at the correlation circuit 4 consists essentially of two components, the adapted radio signal is supplied to it for elimination at 10 .

Als Kalibriersignal kann das Entertainmentsignal benutzt wer­ den oder ein unkorreliertes Signal, das dem Entertainment­ signal zugemischt ist. Es kann dabei dem Entertainmentsignal additiv oder multiplikativ zugemischt sein. Das Kalibrier­ signal kann vom Entertainmentsignal vollständig oder zum Teil maskiert sein. Auch kann ein Diracstoß als Kalibriersignal verwendet werden. Daneben kann das Entertainmentsignal auch ein spezielles Musikstück sein, das über das Autoradio oder über den Kassettenrecorder oder über einen CD-Spieler oder einen Speicherbaustein abgespielt wird.The entertainment signal can be used as a calibration signal the or an uncorrelated signal related to entertainment signal is mixed. It can be the entertainment signal be added additively or multiplicatively. The calibration signal can be completely or partially from the entertainment signal be masked. A Dirac shock can also be used as a calibration signal  be used. In addition, the entertainment signal can also be a special piece of music played on the car radio or via the cassette recorder or via a CD player or a memory chip is played.

Statt der Lautsprecher bzw. Mikrofone können Aktuatoren bzw. Sensoren anderer Bauart verwendet werden. Statt des Radiosi­ gnals kann ein anderes Geräusch oder ein anderer Klang zur Verdeckung des Kalibriersignals benutzt werden, der durch seine Eigenschaften weniger störend als das Kalibriersignal empfunden wird.Instead of the loudspeakers or microphones, actuators or Other types of sensors are used. Instead of the radio gnals may have a different sound or sound Concealment of the calibration signal used by its properties are less disturbing than the calibration signal is felt.

Claims (10)

1. Kalibrierzyklus für ein ANC-System (Active Noise Control System) mit mindestens einem Lautsprecher und mindestens einem Mikrofon, dadurch gekennzeichnet, daß das zu über­ tragende unkorrelierte Kalibriersignal in Kombination mit Zusatzsignalen abgestrahlt wird und daß bei der Be­ stimmung der Übertragungsfunktionen von den Lautspre­ chern zu den Mikrofonen die Zusatzsignale rechnerisch eliminiert werden.1. Calibration cycle for an ANC system (Active Noise Control System) with at least one loudspeaker and at least one microphone, characterized in that the uncorrelated calibration signal to be transmitted is emitted in combination with additional signals and that when determining the transfer functions of the loudspeaker The additional signals to the microphones are computationally eliminated. 2. Kalibrierzyklus nach Anspruch 1, dadurch gekennzeichnet, daß als Kalibriersignal das Entertainmentsignal benutzt wird.2. Calibration cycle according to claim 1, characterized in that that the entertainment signal is used as the calibration signal becomes. 3. Kalibrierzyklus nach Anspruch 2, dadurch gekennzeichnet, daß als Entertainmentsignal das Radiosignal benutzt wird.3. calibration cycle according to claim 2, characterized in that uses the radio signal as entertainment signal becomes. 4. Kalibrierzyklus nach Anspruch 1 oder 2, dadurch gekenn­ zeichnet, daß das unkorrelierte Signal dem Entertain­ mentsignal additiv zugemischt wird.4. calibration cycle according to claim 1 or 2, characterized records that the uncorrelated signal to the entertain ment signal is added additively. 5. Kalibrierzyklus nach Anspruch 1, 2 oder 3, dadurch ge­ kennzeichnet, daß das Kalibriersignal das Entertainment­ signal moduliert oder umgekehrt.5. calibration cycle according to claim 1, 2 or 3, characterized ge indicates that the calibration signal is entertainment signal modulated or vice versa. 6. Kalibrierzyklus nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß das Kalibriersignal vom Entertainmentsignal vollständig oder zum Teil maskiert ist.6. calibration cycle according to one of the preceding claims, characterized in that the calibration signal from Entertainment signal completely or partially masked is. 7. Kalibrierzyklus nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß als unkorreliertes Signal ein Diracstoß verwendet wird, der im Entertainmentsignal eingemischt ist.7. calibration cycle according to one of the preceding claims, characterized in that as an uncorrelated signal  a Dirac shock is used in the entertainment signal is mixed in. 8. Kalibrierzyklus nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß das Kalibriersignal ein spe­ zielles Musikstück oder eine Klangfolge ist.8. calibration cycle according to one of the preceding claims, characterized in that the calibration signal a spe is a target piece of music or a sound sequence. 9. Kalibrierzyklus nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß als Entertainmentsignal ein Signal vom Kassettenrecorder oder vom CD-Spieler oder von einem Speicherbaustein benutzt wird.9. calibration cycle according to one of the preceding claims, characterized in that as an entertainment signal Signal from the cassette recorder or from the CD player or is used by a memory chip. 10. Kalibrierzyklus nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß statt des Entertainment­ signals ein anderes Geräusch oder ein anderer Klang zur Verdeckung des Kalibriersignals benutzt wird, der durch seine Eigenschaften weniger störend als das Kalibrier­ signal empfunden wird.10. calibration cycle according to one of the preceding claims, characterized in that instead of entertainment signals a different sound or a different sound Concealment of the calibration signal used by its properties are less disturbing than the calibration signal is felt.
DE4115009A 1991-05-08 1991-05-08 USE OF THE RADIO SIGNAL IN THE CALIBRATION CYCLE OF AN ACTIVE NOISE REDUCTION SYSTEM Withdrawn DE4115009A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE4115009A DE4115009A1 (en) 1991-05-08 1991-05-08 USE OF THE RADIO SIGNAL IN THE CALIBRATION CYCLE OF AN ACTIVE NOISE REDUCTION SYSTEM
EP92107482A EP0512445B1 (en) 1991-05-08 1992-05-02 Active noise attenuation system using the radio signal for the calibration cycle
DE59209279T DE59209279D1 (en) 1991-05-08 1992-05-02 Use of the radio signal in the calibration cycle of an active noise reduction system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE4115009A DE4115009A1 (en) 1991-05-08 1991-05-08 USE OF THE RADIO SIGNAL IN THE CALIBRATION CYCLE OF AN ACTIVE NOISE REDUCTION SYSTEM

Publications (1)

Publication Number Publication Date
DE4115009A1 true DE4115009A1 (en) 1992-11-12

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Family Applications (2)

Application Number Title Priority Date Filing Date
DE4115009A Withdrawn DE4115009A1 (en) 1991-05-08 1991-05-08 USE OF THE RADIO SIGNAL IN THE CALIBRATION CYCLE OF AN ACTIVE NOISE REDUCTION SYSTEM
DE59209279T Expired - Lifetime DE59209279D1 (en) 1991-05-08 1992-05-02 Use of the radio signal in the calibration cycle of an active noise reduction system

Family Applications After (1)

Application Number Title Priority Date Filing Date
DE59209279T Expired - Lifetime DE59209279D1 (en) 1991-05-08 1992-05-02 Use of the radio signal in the calibration cycle of an active noise reduction system

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EP (1) EP0512445B1 (en)
DE (2) DE4115009A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4344302A1 (en) * 1992-12-25 1994-06-30 Fuji Heavy Ind Ltd Interior noise reduction system for vehicles
DE4315000A1 (en) * 1993-05-06 1994-11-10 Opel Adam Ag Noise-compensated hands-free system in motor vehicles
DE19639216A1 (en) * 1996-09-25 1998-03-26 Thomson Brandt Gmbh Wow noise suppression method for optical turntable
US5914924A (en) * 1996-09-25 1999-06-22 Deutsche Thomson-Brandt Gmbh Reproducing or recording device for reproducing, or recording on, an optical recording medium

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2274757A (en) * 1993-01-28 1994-08-03 Secr Defence Ear defenders employing active noise control
WO1994024662A1 (en) * 1993-04-21 1994-10-27 Sri International Method of calculating filter weights for compression wave cancellation systems
AU6786394A (en) * 1993-06-11 1995-01-03 Caterpillar Inc. Error path transfer function modelling in active noise cancellation
FR2771541B1 (en) * 1997-11-21 2000-10-20 Jean Claude Decaux ACTIVE SOUNDPROOFING METHOD AND DEVICE
US7139400B2 (en) * 2002-04-22 2006-11-21 Siemens Vdo Automotive, Inc. Microphone calibration for active noise control system
EP1770685A1 (en) 2005-10-03 2007-04-04 Maysound ApS A system for providing a reduction of audiable noise perception for a human user
DE102015214134A1 (en) * 2015-07-27 2017-02-02 Bayerische Motoren Werke Aktiengesellschaft Method and control device for active sound suppression in a motor vehicle
DE102016001593B4 (en) * 2016-02-11 2024-07-25 Audi Ag Method for generating a counter sound for noise reduction in a motor vehicle and motor vehicle

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Publication number Priority date Publication date Assignee Title
US4677676A (en) * 1986-02-11 1987-06-30 Nelson Industries, Inc. Active attenuation system with on-line modeling of speaker, error path and feedback pack
GB8820922D0 (en) * 1988-09-06 1988-10-05 Topexpress Ltd Noise reduction in vehicles cabins
GB8903201D0 (en) * 1989-02-13 1989-03-30 Lotus Group Plc Noise suppression in vehicles
GB8908980D0 (en) * 1989-04-20 1989-06-07 Lotus Group Plc Treatment of noise in vehicles
JPH0834647B2 (en) * 1990-06-11 1996-03-29 松下電器産業株式会社 Silencer

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4344302A1 (en) * 1992-12-25 1994-06-30 Fuji Heavy Ind Ltd Interior noise reduction system for vehicles
DE4344302C2 (en) * 1992-12-25 1998-01-29 Fuji Heavy Ind Ltd Active interior noise reduction system for vehicles
DE4315000A1 (en) * 1993-05-06 1994-11-10 Opel Adam Ag Noise-compensated hands-free system in motor vehicles
DE19639216A1 (en) * 1996-09-25 1998-03-26 Thomson Brandt Gmbh Wow noise suppression method for optical turntable
US5914924A (en) * 1996-09-25 1999-06-22 Deutsche Thomson-Brandt Gmbh Reproducing or recording device for reproducing, or recording on, an optical recording medium

Also Published As

Publication number Publication date
EP0512445B1 (en) 1998-04-15
EP0512445A2 (en) 1992-11-11
DE59209279D1 (en) 1998-05-20
EP0512445A3 (en) 1993-09-01

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