EP1308926B1 - Aktives Lärmunterdrückungssystem mit Frequenzansprechkontrolle - Google Patents

Aktives Lärmunterdrückungssystem mit Frequenzansprechkontrolle Download PDF

Info

Publication number
EP1308926B1
EP1308926B1 EP02079479A EP02079479A EP1308926B1 EP 1308926 B1 EP1308926 B1 EP 1308926B1 EP 02079479 A EP02079479 A EP 02079479A EP 02079479 A EP02079479 A EP 02079479A EP 1308926 B1 EP1308926 B1 EP 1308926B1
Authority
EP
European Patent Office
Prior art keywords
reference signal
signal
domain response
amplitude
phase
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
EP02079479A
Other languages
English (en)
French (fr)
Other versions
EP1308926A2 (de
EP1308926A3 (de
Inventor
Manish Vaishya
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.)
Continental Tire Canada Inc
Original Assignee
Siemens VDO Automotive Inc
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 Siemens VDO Automotive Inc filed Critical Siemens VDO Automotive Inc
Publication of EP1308926A2 publication Critical patent/EP1308926A2/de
Publication of EP1308926A3 publication Critical patent/EP1308926A3/de
Application granted granted Critical
Publication of EP1308926B1 publication Critical patent/EP1308926B1/de
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

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
    • G10K11/1781—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
    • G10K11/17813—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
    • G10K11/17855—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
    • G10K11/1787—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
    • G10K2210/128—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
    • G10K2210/3023—Estimation of noise, e.g. on error signals
    • G10K2210/30232—Transfer functions, e.g. impulse response

Definitions

  • This invention generally relates to active noise cancellation systems and methods. More particularly, this invention relates to frequency response control for generating reference signals in a noise cancellation system.
  • Noise cancellation systems have a variety of uses.
  • One example use is on automotive vehicles for reducing noise propagation into the passenger compartment.
  • Modern day vehicles typically include an air induction system.
  • air induction systems One drawback of air induction systems is that engine noise frequently travels through the air induction system and emanates out of the mouth of the air intake such that the noises are noticeable in the passenger compartment. This is particularly true under wide open throttle conditions.
  • Various efforts have been made to reduce the amount of engine noise traveling through the air induction system. Some arrangements include using passive devices such as expansion chambers and Helmholtz resonators. Other efforts include active methods such as anti-noise generators.
  • Typical active systems include a speaker that generates a sound to attenuate the noise.
  • the sound from the speaker typically is out of phase with the noise and combines with the noise such that the result is a reduced noise, which results in less noise transmission into the passenger compartment, for example.
  • the speaker sound can be referred to as a noise cancellation signal.
  • Digital signal processors such as microprocessors typically generate cancellation signals for driving the speaker to achieve the noise cancellation.
  • the microprocessor typically requires some input from the relevant environment to adequately address the need for noise cancellation.
  • computer modeling is used so that the microprocessor is able to provide a desired level of noise cancellation.
  • This invention provides an enhancement to active noise cancellation that reduces the burden on the processor within the system and provides a more accurate and reliable method of canceling noise.
  • One particular application for a system designed according to this invention is for canceling engine noise in a vehicle air intake assembly.
  • US-A-5 768 124 describes an adaptive control system, usable for noise cancellation, which is sensitive to fault conditions that can lead to instability in the system; the system being capable of providing a fault indication which can be used to shut the system down.
  • this document discloses the use of a C filter which provides a model of the acoustic response within the region of noise cancellation. That filter may be calculated in the frequency domain and used for computing an adaptive response filter which is used to generate a noise cancelling signal by modifying a reference signal.
  • the reference signal may be at least one harmonic frequency and indicative of the undesired signal.
  • the present invention relates to an active noise cancellation system according to claim 10.
  • a system designed according to this invention includes a speaker.
  • a microphone is arranged to detect a combination of a sound from the speaker and noise in the system.
  • a controller has a first module that provides a frequency domain response of the portion of the system associated with the speaker and microphone (i.e., the secondary path) for at least one known frequency.
  • a second module provides a reference signal having an amplitude and phase that are set based upon the frequency domain response information. The reference signal is then used by another portion of the controller for generating a cancellation signal, which drives the speaker.
  • Applying the frequency domain response information to the reference signal in one example is accomplished by multiplying the amplitude of a reference signal and shifting the phase of the reference signal in amounts corresponding to the frequency domain response information.
  • the reference signal is effectively broken down into sine and cosine components. An appropriate gain is then applied to each of the components to achieve the desired amplitude and phase adjustments based upon the frequency domain response information. Modulating the sine and cosine components provides the desired reference signal characteristics.
  • the module of the controller that provides the frequency domain response first determines a time domain response of the portion of the system including the speaker and the microphone. The first module then applies a Fast Fourier Transform to the time domain response to determine the frequency domain response information.
  • a system designed according to this invention greatly reduces the amount of computation required within a controller of an active noise cancellation system.
  • One significant benefit of this invention is that it requires less memory within a controller, which allows for a greater variety of electronics to be utilized.
  • Another advantage is that the controller is able to provide a faster response during active noise cancellation.
  • the present invention relates to a method of cancelling noise according to claim 1.
  • Figure 1 schematically shows selected portions of an active noise cancellation system 20.
  • This system may have a variety of uses where active noise cancellation is desired.
  • the system 20 will be assumed to be part of an active noise cancellation system for canceling noise in an air induction system on a vehicle that is useful for reducing the level of engine noise that propagates into a passenger compartment.
  • the invention is not limited to such an environment.
  • a tone generator 22 generates a reference signal responsive to information from a sensor 24.
  • the sensor 24 comprises a tachometer that provides information regarding the rotations per minute (RPM) of a vehicle engine.
  • the tone generator 22 preferably includes programming to provide a plurality of discrete tones each having a known frequency, which tones are selected based upon the information regarding the engine RPM.
  • the particular frequencies and the number of tones generated by the tone generator 22 preferably are selected to meet the needs of a particular situation. Those skilled in the art who have the benefit of this description can use known techniques for deciding how the tone generator 22 should respond to the different inputs available from the sensor 24.
  • a cancellation signal generating module 26 modifies the reference signal tones from the tone generator 22 and provides a cancellation signal for driving a speaker 28.
  • a noise cancellation signal (i.e., sound) 30 emanates from the speaker 28 responding to the cancellation signal from the module 26.
  • the noise cancellation signal 30 preferably attenuates noise within the system to a desired level.
  • a microphone 32 provides modeling and feedback information regarding the results of the noise cancellation signal 30.
  • the microphone 32 detects the combination of noise within the system and the noise cancellation signal 30. Under ideal circumstances, the noise cancellation signal 30 has the effect of minimizing the noise to a desired level.
  • the signals from the microphone 32 preferably are processed, using a summer 34 for example, to determine whether the desired noise cancellation effect is achieved.
  • the desired level of noise cancellation in the illustrated example is provided to the summer 34 by a desired signal generator module 36.
  • the results of the comparison between the desired signal and the information received by the microphone 32 provide an error signal that is input to a convergence module 38.
  • the illustrated example utilizes any one of a variety of known convergence techniques such as an LMS algorithm so that repeated modifications to the noise cancellation signal eventually result in the desired noise reduction in the system.
  • a reference signal modifying module 40 provides modification to the reference signal from the tone generator 22. This allows continuously modifying the reference signal information using the convergence module 38 to repeatedly update the effects of a cancellation signal generated by the module 26 so that an ideal cancellation signal for a given input may be determined.
  • convergence module 38 provides modification to the reference signal from the tone generator 22. This allows continuously modifying the reference signal information using the convergence module 38 to repeatedly update the effects of a cancellation signal generated by the module 26 so that an ideal cancellation signal for a given input may be determined.
  • the reference signal modifying module 40 preferably operates based upon a frequency domain response of the portion of the system that includes the speaker 28 and the microphone 32 (i.e., the so-called secondary path).
  • a frequency domain response modeling module 42 provides information regarding the frequency domain response of the secondary path 44 to the reference signal modifying module 40.
  • the reference signal modifying module 40 multiplies the amplitude of a reference signal from the tone generator 22 using an amplitude adjustment factor that is determined based upon the frequency domain response information.
  • the reference signal modifying module 40 preferably also adjusts (i.e., shifts) the phase of the reference signal in an amount that corresponds to the frequency domain response of the secondary path 44.
  • a multiplier is applied to the amplitude of the signal and a phase adjustment amount is applied to the phase to achieve the desired phase of the reference signal prior to that reference signal being fed to the cancellation signal generating module 26.
  • the tone generator 22 generates a plurality of reference tones having known frequencies with a unity amplitude and zero phase that is adjusted by the reference signal modifying module 40.
  • the tone generator 22 includes the reference signal modifying module 40 so that the reference tones are generated with the known frequencies and include the desired phase and amplitude, which were determined based upon the frequency domain response information.
  • the various modules discussed above and schematically illustrated in Figures 1 and 2 comprise software within a controller in some example systems designed according to this invention.
  • the various modules may not necessarily require distinct or separate portions of software code to achieve the results accomplished by each of the modules.
  • the module distinctions within this description are schematic and for illustration purposes only as those skilled in the art may realize that there are functions of one or more of the modules that may be accomplished within another module designed according to this invention.
  • software modules are utilized in one preferred implementation of this invention, various microprocessors or dedicated portions of controllers may be used to perform the same functions. Additionally, custom designed circuitry may accomplish one or more of the functions of the modules described in this specification.
  • FIG. 3 graphically illustrates an example output 50 of a finite impulse response filter, which is obtained using known techniques.
  • Finite impulse response (FIR) filters provide a time domain response of a secondary path and provide an output similar to that illustrated in Figure 3, depending on the particular configuration of a given system.
  • the FIR filter has 126 taps, which provides the controller of the system with 126 numbers that would be used within the controller for filtering a reference signal, for example.
  • the FIR filter was used to filter the reference signal to achieve the desired reference signal needed to accomplish the noise cancellation for a given situation.
  • Such filtering techniques require a relatively large amount of computation and memory. For example, each reference tone would be multiplied 126 times using the FIR filter.
  • FIG. 4 and 5 graphically illustrate a frequency domain response of the secondary path 44 that corresponds to the time domain response of Figure 3.
  • Figure 4 graphically illustrates the amplitude 52 of the frequency domain response while
  • Figure 5 graphically illustrates the phase 54 of the frequency domain response.
  • the values from Figures 4 and 5 are preferably stored within memory in the system controller so that the desired amplitude and phase adjustments are accomplished.
  • each reference tone is multiplied twice (rather than 126 times) to achieve the desired adaptation.
  • the time domain response of Figure 3 preferably is converted into the frequency domain response of Figures 4 and 5 using a Fast Fourier Transform. This provides the value by which the amplitude of the reference signal preferably is multiplied and the amount by which the phase of the reference signal preferably is shifted.
  • a quadrature method is applied for achieving the desired modification to a reference signal.
  • the reference signal preferably is broken down into sine and cosine components.
  • An appropriate gain is applied to each of the reference signal components to get the effect of amplitude multiplication and phase shifting according to the determined frequency domain response of the secondary path.
  • Known modulation techniques also may be used on the sine and cosine components to yield the desired reference signal.
  • a quadrature method or phase shifting and multiplication method may be used in a module 40 that is separate from (i.e., downstream) the tone generator 22, which generates a reference signal having a unity amplitude and zero phase.
  • the adjustment to the phase and amplitude of the reference signal may occur in the tone generator, itself, so that a separate computation need not be applied once the reference tone is generated.
  • the modeling that provides the frequency domain response preferably is accomplished with the system controller operating in a modeling mode.
  • a separate control mode preferably is used for generating the noise cancellation signal from the speaker 28 during active noise control.
  • the controller preferably operates in these two different modes at different times so that the available memory and processing time is not compromised.
  • the modeling mode includes using an FIR filter to obtain a time domain response of the secondary path using known techniques such as an LMS algorithm.
  • the inventive system applies a Fast Fourier Transform to the model of the time domain response. This provides the amplitude and phase adjustment information that can be stored in the controller for later use during the control mode.
  • the controller makes a direct measurement of the frequency response of the secondary path using a known technique.
  • the frequency domain response information can then be applied to the reference signal similar to the examples described above.

Landscapes

  • 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)

Claims (15)

  1. Verfahren zum Unterdrücken von Lärm in einem Lärmunterdrückungssystem (20), das einen Pfad (44) zwischen einem Generator (26, 28) eines Lärmunterdrückungssignals (30) und einem Schalldetektor (32), welcher die Wirkung des Lärmunterdrückungssignals erfasst, aufweist, welches die folgenden Schritte umfasst:
    Erzeugen eines Referenzsignals, das einen oder mehrere diskrete Töne von bekannter Frequenz umfasst;
    Vergleichen (34) eines Signals, das die besagte Wirkung angibt, mit einem Signal, das eine gewünschte Wirkung angibt, um ein Fehlersignal zu erzeugen;
    Benutzen (38, 26) des besagten Fehlersignals, um das besagte Referenzsignal in einer Richtung hin zu einer Verringerung des besagten Fehlersignals zu ändern;
    Bestimmen (42) einer Antwort im Frequenzbereich des Pfades für wenigstens ein Signal mit einer bekannten Frequenz; und
    Korrigieren (40) der Phase und Amplitude wenigstens eines der besagten Töne, die in dem Referenzsignal enthalten sind, in Reaktion auf die ermittelte Antwort im Frequenzbereich.
  2. Verfahren nach Anspruch 1, welches das Erzeugen (24, 22) einer Vielzahl von Referenzsignaltönen, die jeweils eine bekannte Frequenz haben, und das Korrigieren (40) der Amplitude und Phase jedes Tons einzeln umfasst.
  3. Verfahren nach Anspruch 1 oder 2, welches umfasst: das Bestimmen eines Amplitudenkorrekturwertes und das Verwenden des Amplitudenkorrekturwertes, um die Amplitude des Tons oder der Töne, die in dem Referenzsignal enthalten sind, zu korrigieren; das Bestimmen eines Phasenverschiebungsbetrages und das Verschieben der Phase des Tons oder der Töne, die in dem Referenzsignal enthalten sind, um den ermittelten Betrag.
  4. Verfahren nach Anspruch 1 oder 2, welches das Anwenden eines Verstärkungsfaktors auf jede von mehreren Komponenten umfasst, wenn das Referenzsignal eine Sinus-Komponente und eine Cosinus-Komponente umfasst, um die korrigierte Phase und Amplitude des Referenzsignals zu erreichen.
  5. Verfahren nach einem der vorhergehenden Ansprüche, wobei das System einen Tongenerator (22) aufweist, welcher das Referenzsignal erzeugt, und wobei die Korrektur (40) in dem Tongenerator erfolgt.
  6. Verfahren nach einem der vorhergehenden Ansprüche, wobei das System einen Tongenerator (22) enthält, welcher das Referenzsignal mit einer konsistenten Phase und Amplitude erzeugt, und wobei das Korrigieren (26) im Anschluss an den Tongenerator erfolgt, der das Referenzsignal erzeugt.
  7. Verfahren nach einem der vorhergehenden Ansprüche, wobei das System einen Drehzahlmesser (24) enthält, welcher Informationen hinsichtlich eines Drehzahlwertes eines Fahrzeugmotors liefert, und wobei die Frequenz des Referenzsignals dem Drehzahlwert entspricht.
  8. Verfahren nach einem der vorhergehenden Ansprüche, welches das Bestimmen einer Antwort im Zeitbereich des Pfades (44) und das Bestimmen der Antwort im Frequenzbereich durch Anwendung einer schnellen Fouriertransformation auf die Antwort im Zeitbereich umfasst.
  9. Verfahren nach einem der vorhergehenden Ansprüche, welches den Betrieb in einem ersten Modus zum Bestimmen der Antwort im Frequenzbereich und den Betrieb in einem zweiten Modus während des Korrigierens der Phase und Amplitude des Referenzsignals umfasst und eine Verzögerung zwischen dem ersten und dem zweiten Modus umfasst.
  10. Aktives Lärmunterdrückungssystem, welches umfasst:
    einen Lautsprecher (28);
    einen Tongenerator (22), welcher dazu bestimmt ist, ein Referenzsignal zu erzeugen, das wenigstens einen diskreten Ton mit bekannter Frequenz umfasst;
    Mittel, die einen Unterdrückungssignal-Generator (26) zum Benutzen des besagten Referenzsignals, um ein Unterdrückungssignal (30) zum Anlegen an den besagten Lautsprecher zu erzeugen, enthalten;
    ein Mikrofon (32), welches dazu bestimmt ist, eine Kombination von Schall vom Lautsprecher und von Lärm im System zu erfassen;
    Mittel (34) zum Vergleichen eines Signals, das die besagte Kombination angibt, mit einem gewünschten Signal und zum Erzeugen eines Fehlersignals, das eine Differenz zwischen dem besagten Signal, das die besagte Kombination angibt, und dem besagten gewünschten Signal angibt;
    Mittel (38, 26) zum Benutzen des besagten Fehlersignals, um das besagte Referenzsignal in einer Richtung hin zu einer Verringerung des besagten Fehlersignals zu ändern; und
    ein Steuergerät, das ein erstes Modul (42), das dazu bestimmt ist, eine Antwort im Frequenzbereich des mit dem Lautsprecher und dem Mikrofon zusammenhängenden Teils des Systems zu liefern, und ein zweites Modul (40), das dazu bestimmt ist, die Phase und Amplitude des besagten in dem Referenzsignal enthaltenen wenigstens einen Tons entsprechend den Informationen der Antwort im Frequenzbereich zu korrigieren, aufweist.
  11. System nach Anspruch 10, wobei der Tongenerator (22) dazu bestimmt ist, ein Referenzsignal mit Amplitude eins und Phase null zu erzeugen, und wobei das zweite Modul (40) dazu bestimmt ist, die Amplitude und Phase des Referenzsignals zu korrigieren, nachdem das Referenzsignal von dem Generator erzeugt worden ist.
  12. System nach Anspruch 10, wobei der Tongenerator (22) das zweite Modul (40) enthält, so dass das Referenzsignal, das von dem Tongenerator geliefert wird, die gewünschte Amplitude und Phase aufweist.
  13. System nach einem der Ansprüche 10 bis 12, das ein Filter mit endlicher Impulsantwort enthält, welches dazu bestimmt ist, eine Antwort im Zeitbereich des Teils des Systems zu liefern, der mit dem Lautsprecher (28) und dem Mikrofon (32) zusammenhängt, und wobei das erste Modul (42) dazu bestimmt ist, eine schnelle Fouriertransformation auf die Antwort im Zeitbereich anzuwenden, um die Antwort im Frequenzbereich zu liefern.
  14. System nach einem der Ansprüche 10 bis 13, wobei das Steuergerät dazu bestimmt ist, in einem ersten Modus zum Bestimmen der Antwort im Frequenzbereich zu arbeiten, und dazu bestimmt ist, zu einer anderen Zeit in einem zweiten Modus zum Anwenden der Phasen- und Amplitudenkorrektur auf das Referenzsignal zu arbeiten.
  15. System nach Anspruch 14, das eine Verzögerung zwischen dem Betrieb des Steuergerätes im ersten Modus und im zweiten Modus aufweist, und wobei das Steuergerät dazu bestimmt ist, während der Verzögerung eine Konvertierung zwischen einer ermittelten Antwort im Zeitbereich des Teils des Systems, der mit dem Lautsprecher (28) und dem Mikrofon (32) zusammenhängt, und der Antwort im Frequenzbereich durchzuführen.
EP02079479A 2001-10-30 2002-10-25 Aktives Lärmunterdrückungssystem mit Frequenzansprechkontrolle Expired - Fee Related EP1308926B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US34102601P 2001-10-30 2001-10-30
US341026P 2001-10-30
US271440 2002-10-15
US10/271,440 US20030079937A1 (en) 2001-10-30 2002-10-15 Active noise cancellation using frequency response control

Publications (3)

Publication Number Publication Date
EP1308926A2 EP1308926A2 (de) 2003-05-07
EP1308926A3 EP1308926A3 (de) 2004-01-21
EP1308926B1 true EP1308926B1 (de) 2007-02-21

Family

ID=26954898

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02079479A Expired - Fee Related EP1308926B1 (de) 2001-10-30 2002-10-25 Aktives Lärmunterdrückungssystem mit Frequenzansprechkontrolle

Country Status (3)

Country Link
US (1) US20030079937A1 (de)
EP (1) EP1308926B1 (de)
DE (1) DE60218265T2 (de)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7706547B2 (en) * 2002-12-11 2010-04-27 General Electric Company System and method for noise cancellation
JP4283212B2 (ja) * 2004-12-10 2009-06-24 インターナショナル・ビジネス・マシーンズ・コーポレーション 雑音除去装置、雑音除去プログラム、及び雑音除去方法
US7775320B2 (en) * 2008-03-20 2010-08-17 Honda Motor Co., Ltd. Method for reducing noise in a vehicle cabin
DE102011018459A1 (de) * 2011-04-21 2012-10-25 J. Eberspächer GmbH & Co. KG Übertragungsstreckenkompensator
TW201247996A (en) * 2011-05-26 2012-12-01 Anpec Electronics Corp Noiseless motor apparatus and denoise driver
EP2624251B1 (de) 2012-01-31 2014-09-10 Harman Becker Automotive Systems GmbH Verfahren zur Anpassung eines ANC-Systems
WO2020012235A1 (en) * 2018-07-13 2020-01-16 Bosch Car Multimedia Portugal, S.A. Active noise cancelling system, based on a frequency domain audio control unit, and respective method of operation
CN112312250B (zh) * 2019-07-30 2022-07-19 瑞昱半导体股份有限公司 具有抗噪机制的音频播放装置及方法

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5692052A (en) * 1991-06-17 1997-11-25 Nippondenso Co., Ltd. Engine noise control apparatus
US5809152A (en) * 1991-07-11 1998-09-15 Hitachi, Ltd. Apparatus for reducing noise in a closed space having divergence detector
US5404409A (en) * 1991-07-31 1995-04-04 Fujitsu Ten Limited Adaptive filtering means for an automatic sound controlling apparatus
US5410606A (en) * 1992-07-21 1995-04-25 Honda Giken Kogyo Kabushiki Kaisha Noise canceling method
GB9222103D0 (en) * 1992-10-21 1992-12-02 Lotus Car Adaptive control system
JP3340496B2 (ja) * 1993-03-09 2002-11-05 富士通株式会社 アクティブ騒音制御システムの伝達特性の推定方法
US5689572A (en) * 1993-12-08 1997-11-18 Hitachi, Ltd. Method of actively controlling noise, and apparatus thereof
US5978489A (en) * 1997-05-05 1999-11-02 Oregon Graduate Institute Of Science And Technology Multi-actuator system for active sound and vibration cancellation
US6298139B1 (en) * 1997-12-31 2001-10-02 Transcrypt International, Inc. Apparatus and method for maintaining a constant speech envelope using variable coefficient automatic gain control
US6208949B1 (en) * 1998-07-01 2001-03-27 Adaptive Audio, Inc. Method and apparatus for dynamical system analysis

Also Published As

Publication number Publication date
US20030079937A1 (en) 2003-05-01
DE60218265T2 (de) 2007-07-19
EP1308926A2 (de) 2003-05-07
DE60218265D1 (de) 2007-04-05
EP1308926A3 (de) 2004-01-21

Similar Documents

Publication Publication Date Title
EP2395501B1 (de) Adaptive Geräuschsteuerung
US7340065B2 (en) Active noise control system
EP1515304B1 (de) Aktives Lärmunterdrückungssystem mit einem adaptiven Filter und einem Korrekturfilter
US9478209B2 (en) Tunable active noise control
JP3365774B2 (ja) 雑音整形のための能動制御装置
JP5713958B2 (ja) 能動型騒音制御装置
US20090060217A1 (en) Vehicular active vibratory noise control apparatus
WO1994009482A1 (en) Adaptive control system
US8150055B2 (en) Active noise control system and active vibration control system
EP1308926B1 (de) Aktives Lärmunterdrückungssystem mit Frequenzansprechkontrolle
US7450725B2 (en) Digital filter modeling for active noise cancellation
JP5238368B2 (ja) 車両用能動型音響制御システム
US20030016833A1 (en) Active noise cancellation system utilizing a signal delay to accommodate noise phase change
CN113470607B (zh) 有源振动噪音降低系统
JP4590389B2 (ja) 能動型振動騒音制御装置
JP2935592B2 (ja) 騒音制御装置
JPH0736468A (ja) 適応制御装置
JP3275449B2 (ja) 能動型騒音制御装置及び能動型振動制御装置
JP6902739B2 (ja) 能動型騒音低減装置および能動型騒音低減方法
JP4516774B2 (ja) 振動制御システム
CN114822476A (zh) 有源噪声控制装置
JPH0535285A (ja) 能動型騒音制御装置
JPH05265466A (ja) 能動型振動制御装置及び能動型騒音制御装置

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SK TR

AX Request for extension of the european patent

Extension state: AL LT LV MK RO SI

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SK TR

AX Request for extension of the european patent

Extension state: AL LT LV MK RO SI

17P Request for examination filed

Effective date: 20040227

AKX Designation fees paid

Designated state(s): DE GB

17Q First examination report despatched

Effective date: 20050309

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE GB

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

REF Corresponds to:

Ref document number: 60218265

Country of ref document: DE

Date of ref document: 20070405

Kind code of ref document: P

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed

Effective date: 20071122

REG Reference to a national code

Ref country code: DE

Ref legal event code: R084

Ref document number: 60218265

Country of ref document: DE

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20181031

Year of fee payment: 17

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20181228

Year of fee payment: 17

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 60218265

Country of ref document: DE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20200501

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20191025

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20191025