DE102004041214B4 - Sound reduction device for noise source in aircraft cabin has electroacoustic transducer comprising suspended membrane having spring stiffness and adjustment unit arranged to change spring stiffness - Google Patents

Sound reduction device for noise source in aircraft cabin has electroacoustic transducer comprising suspended membrane having spring stiffness and adjustment unit arranged to change spring stiffness Download PDF

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Publication number
DE102004041214B4
DE102004041214B4 DE102004041214A DE102004041214A DE102004041214B4 DE 102004041214 B4 DE102004041214 B4 DE 102004041214B4 DE 102004041214 A DE102004041214 A DE 102004041214A DE 102004041214 A DE102004041214 A DE 102004041214A DE 102004041214 B4 DE102004041214 B4 DE 102004041214B4
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Prior art keywords
electroacoustic transducer
spring stiffness
signal
noise source
sound
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Expired - Fee Related
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DE102004041214A
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German (de)
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DE102004041214A1 (en
Inventor
Harald Dipl.-Ing. Breitbach
Christian Dipl.-Ing. Gerner
Delf Sachau
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Airbus Operations GmbH
Helmut Schmidt Universitaet
Original Assignee
HELMUT SCHMIDT UNI UNI DER BUN
Airbus Operations GmbH
Helmut Schmidt Universitaet
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Application filed by HELMUT SCHMIDT UNI UNI DER BUN, Airbus Operations GmbH, Helmut Schmidt Universitaet filed Critical HELMUT SCHMIDT UNI UNI DER BUN
Priority to DE102004041214A priority Critical patent/DE102004041214B4/en
Priority to AT05018501T priority patent/ATE554476T1/en
Priority to EP05018501A priority patent/EP1630788B1/en
Priority to US11/213,424 priority patent/US7885415B2/en
Publication of DE102004041214A1 publication Critical patent/DE102004041214A1/en
Application granted granted Critical
Publication of DE102004041214B4 publication Critical patent/DE102004041214B4/en
Expired - Fee Related legal-status Critical Current
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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
    • G10K11/17883—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
    • 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
    • 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
    • G10K2210/3227—Resonators
    • G10K2210/32271—Active resonators
    • 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
    • G10K2210/511—Narrow band, e.g. implementations for single frequency cancellation

Abstract

An electroacoustic transducer having mechanical values generates secondary sound wave as counter sound of primary sound wave generated by a noise source in narrow frequency ranges. The electroacoustic transducer comprises a suspended membrane having a spring stiffness and an adjustment unit arranged to change spring stiffness. - An error microphone set up to measure error signal of primary and secondary sound waves is coupled to a control unit to transmit error signal to the control unit. The control unit receives a reference signal of the noise source, and generates a control signal for changing the mechanical values of the electroacoustic transducer based on the reference signal and the error signal. - An INDEPENDENT CLAIM is also included for a sound reducing method for noise source in e.g. aircraft cabin.

Description

Die Erfindung bezieht sich auf eine Vorrichtung zur Schallminderung von Lärmquellen in schmalen Frequenzbereichen durch Überlagerung von Schallwellen gleicher Amplitude und Frequenz, insbesondere für Flugzeugkabinen, unter Verwendung von elektroakustischen Wandlern zum Erzeugen von Gegenschall.The The invention relates to a device for noise reduction from noise sources in narrow frequency ranges by superposition of sound waves same amplitude and frequency, especially for aircraft cabins, using electro-acoustic transducers for generating counter-sound.

Derartige Ausbildungen als breitbandige Gegenschallanlagen sind bekannt, ermöglichen eine Lärmreduktion von etwa 6 dB und haben einen geringen Wirkungsgrad. Ferner haben derartige Anlagen ein hohes Gewicht und sind durch relativ große Lautsprecheranordnungen nicht für alle Einsatzbereiche, wie in Luftfahrzeugen, geeignet. Die bisherigen Verfahren zur Schallerzeugung für die Lärmminderung verwenden einzelne Baugruppen, die nicht auf die zu erzeugende Frequenz sondern auf ein breitbandiges Übertragungs verhalten abgestimmt sind und somit für einen schmalbandigen Einsatzbereich, wie beispielsweise für die aktive Reduzierung von Propellerlärm, keinen vernünftigen Wirkungsgrad haben, so daß die Notwendigkeit der Verwendung von Verstärkern mit hoher elektrischer Leistung erforderlich ist, die bei mobilen Anwendungen nachteilig sind.such Training as broadband antinoise systems are known, allow a noise reduction of about 6 dB and have a low efficiency. Furthermore Such systems are very heavy and are characterized by relatively large speaker arrangements not for all applications, as in aircraft, suitable. The previous Method for generating sound for use the noise reduction individual assemblies that are not based on the frequency to be generated on a broadband transmission behavior are tuned and thus for a narrowband field of application, such as for the active Reduction of propeller noise, no reasonable Have efficiency, so that the Need to use amplifiers with high electrical Performance is required, which is disadvantageous in mobile applications are.

So beschreibt beispielsweise die DE 33 44 910 A1 ein System zur aktiven akustischen Schalldämpfung, welches Eingangsabtastmittel umfasst, welche imstande sind, den zu dämpfenden Quellenschall abzutasten, um mit einer Aufhebungseinrichtung um 180° phasenverschobene Geräusche zu erzeugen, so dass der Quellenschall eliminiert werden kann.For example, describes the DE 33 44 910 A1 an active acoustic acoustic attenuation system comprising input sampling means capable of sampling the source sound to be attenuated to produce 180 ° out of phase noise with a cancellation means so that the source sound can be eliminated.

Das System umfasst ferner einen elektronischen Regler, der geeignet ist, Signale der Eingangsabtastmittel zu verarbeiten, um Ausgangssignale zu erzeugen, um die Aufhebungseinrichtung zur Erzeugung der um 180° phasenverschobene Geräusche zu veranlassen.The The system further includes an electronic controller that is suitable is to process signals of the input sample means to output signals to generate the cancellation means for generating the 180 ° out of phase Sounds to induce.

In der DE 28 14 093 wird ein akustischer Antischallgeber zur aktiven Geräuschreduzierung beschreiben, der ein Schnellesignal und eine Regeleinrichtung verwendet, um die Federsteifigkeit der Membran des Antischallgebers zu kompensieren, wobei die Federsteifigkeit jedoch konstant gelassen wird.In the DE 28 14 093 describes an active noise reduction acoustic anti-swerving device which uses a quick signal and control to compensate for the spring stiffness of the diaphragm of the antisounder, but leaves the spring stiffness constant.

Letztendlich offenbart die DE 198 36 483 A1 eine Vorrichtung mit welcher Nachschwingzeiten eines elektrischen Schwingkreises im Ultraschallbereich verringert werden sollen.Ultimately, the reveals DE 198 36 483 A1 a device with which Nachschwingzeiten an electrical resonant circuit in the ultrasonic range to be reduced.

Die Aufgabe der Erfindung ist es, auf einfache Weise eine Lärmminderung durch einen schmalbandigen elektroakustischen Energiewandler zu schaffen, der eine aktive Lärmbekämpfung mit einer Anpassung an die vorliegenden Verhältnisse ermöglicht und die Durchführung mit geringem Aufwand für mobile Anlagen gewährleistet.The The object of the invention is to easily reduce noise through a narrow band electroacoustic energy converter, of active noise control with an adaptation to the existing conditions and the implementation with little effort for mobile Equipment guaranteed.

Die Lösung dieser Aufgabe erfolgt erfindungsgemäß dadurch, daß mindestens ein Schallaufnehmer zur Messung eines auftretenden Fehlersignals einer Primärschallwelle der Lärmquelle und einer Sekundärschallwelle eines schmalbandigen elektroakustischen Wandlers einer Regeleinrichtung zuführbar ist, die ein Referenzsignal der Lärmquelle enthält sowie ein Steuersignal zur Veränderung der mechanischen Werte des Wandlers erzeugt, wobei der elektroakustische Wandler zur Veränderung der mechanischen Werte Mittel zur Änderung der Federsteifigkeit der Membranaufhängung aufweist.The solution This object is achieved according to the invention in that at least a sound pickup for measuring an occurring error signal a primary sound wave the source of noise and a secondary sound wave a narrow band electroacoustic transducer of a control device supplied is that contains a reference signal of the noise source as well a control signal for change generated by the mechanical values of the transducer, the electroacoustic Converter for change the mechanical values means for changing the spring stiffness the membrane suspension having.

Durch die Abstimmung mechanischer Eigenschaften des elektroakustischen Wandlers in Verbindung mit der Abstimmung eines elektrischen Schwingkreises ist es möglich, eine vorgegebene Betriebsfrequenz abzustimmen. Eine Adaption der mechanischen und elektrischen Parameter erlaubt dabei eine Anpassung der Eigenschaften während des Betriebs.By the tuning of mechanical properties of the electroacoustic Transducer in conjunction with the tuning of an electrical resonant circuit Is it possible, to tune a predetermined operating frequency. An adaptation of the mechanical and electrical parameters allows an adaptation of the properties during the Operation.

Weiterhin wird vorgeschlagen, daß der elektroakustische Wandler über einen Resonanzverstärker ansteuerbar ist und zur Einstellung einer Betriebsfrequenz über die Regeleinrichtung der gebildete Schwingkreis über eine einstellbare Kapazität anpaßbar ist.Farther It is suggested that the electroacoustic transducer over a resonance amplifier is controllable and to set an operating frequency on the Control device of the formed resonant circuit via an adjustable capacitance is adaptable.

Zur Optimierung der Verhältnisse wird vorgeschlagen, daß die Regeleinrichtung mit einem erfaßten Schnellesignal der Membran des elektroakustischen Wandlers und ein Ausgangssignal des Resonanzverstärkers zusätzlich steuerbar ist.to Optimization of the conditions It is suggested that the Control device with a detected Fast signal of the membrane of the electroacoustic transducer and a Output signal of the resonance amplifier additionally is controllable.

In der Zeichnung sind Ausführungsbeispiele der Erfindung schematisch dargestellt. Es zeigen:In the drawing are embodiments of Invention shown schematically. Show it:

1 eine schematische Prinzipdarstellung eines Gesamtsystems, 1 a schematic diagram of an overall system,

2 eine Ausbildung einer Vorrichtung, 2 an embodiment of a device

3 eine weitere Ausführungsform einer Vorrichtung 3 a further embodiment of a device

Zur Erläuterung der Erfindung ist gemäß 1 eine Lärmquelle 1 dargestellt, die sinusförmige Schallwellen 2 erzeugt. Gleichzeitig wird das Signal als Referenzsignal 3 einer Regeleinrichtung 4 zugeführt. Durch die Regeleinrichtung 4 wird dabei über einen elektroakustischen Wandler mit Verstärker 10 wie einen mechatronischen Lautsprecher, eine zur Schallwelle 2 überlagerte und um 180 Grad verschobene Sekundärschallwelle 6 gleicher Amplitude und Frequenz erzeugt. Der Restlärm wird durch ein Fehlermikrofon 7 erfaßt und mit dem resultierenden Fehlersignal 8 wird die Regeleinrichtung 4 beaufschlagt, um den Restlärm gegen Null zu bringen. Dieses geschieht durch ein durch die Regeleinrichtung 4 ermitteltes Sekundärsignal 9 mit gleicher Frequenz und abweichender Amplitude und Phase als das zugeführte Referenzsignal 3. Das Sekundärsignal 9 wird über den elektroakustischen Wandler 5 in eine Sekundärschallwelle 6 als Gegenschallwelle umgewandelt. Die sich durch die Umwandlung des Sekundärsignals 9 in die Sekundärschallwelle 6 ergebende Amplitude und Phasenänderung wird von der Regeleinrichtung 4 bei der Erzeugung des Sekundärsignals 9 berücksichtigt.To explain the invention is according to 1 a source of noise 1 represented, the sinusoidal sound waves 2 generated. At the same time the signal becomes a reference signal 3 a control device 4 fed. By the control device 4 is doing about an electro-acoustic transducer with amplifier 10 like a mechatronic speaker, one to the sound wave 2 superimposed and shifted by 180 degrees secondary sound wave 6 equal amplitude and frequency generated. The residual noise is through an error microphone 7 detected and with the resulting error signal 8th becomes the control device 4 applied to bring the residual noise to zero. This is done by a through the control device 4 determined secondary signal 9 with the same frequency and different amplitude and phase than the supplied reference signal 3 , The secondary signal 9 is via the electroacoustic transducer 5 in a secondary sound wave 6 converted as a counter sound wave. Which is due to the conversion of the secondary signal 9 in the secondary sound wave 6 resulting amplitude and phase change is from the controller 4 in the generation of the secondary signal 9 considered.

Bei einer konkreten Ausbildung gemäß 2 erhält der elektroakustische Wandler 5 ein monofrequentes Eingangssignal 9 des Reglers 4 über einen Resonanzverstärker 11, das in einen elektrischen Serienschwingkreis eingespeist wird. Dieser Schwingkreis besteht aus elektrischen Komponenten des elektroakustischen Wandlers 5 in Form seiner Induktivität 12 und seinem Widerstand 13 und einer Kapazität 14 des Resonanzverstärkers 11. Die Resonanzfrequenz des Schwingkreises ist entsprechend der gewünschten Betriebsfrequenz eingestellt.For a specific training according to 2 receives the electroacoustic transducer 5 a monofrequent input signal 9 of the regulator 4 via a resonance amplifier 11 which is fed into an electrical series resonant circuit. This resonant circuit consists of electrical components of the electroacoustic transducer 5 in the form of its inductance 12 and his resistance 13 and a capacity 14 of the resonance amplifier 11 , The resonant frequency of the resonant circuit is set according to the desired operating frequency.

Der elektroakustische Wandler 5 wandelt das verstärkte Signal in eine Sekundärschallwelle 6 mit gleicher Frequenz wie das Eingangssignal 10 um. Der elektroakustische Wandler 5 wird so abgestimmt, daß die Resonanzfrequenz des Wandlers der gewünschten Betriebsfrequenz des Systems entspricht.The electroacoustic transducer 5 converts the amplified signal into a secondary sound wave 6 with the same frequency as the input signal 10 around. The electroacoustic transducer 5 is tuned so that the resonant frequency of the transducer corresponds to the desired operating frequency of the system.

Die Regeleinrichtung 4 erhält das Referenzsignal 3 und ermittelt dessen Frequenz. Entspricht die ermittelte Frequenz nicht der eingestellten Frequenz, so ändert die Regeleinrichtung die Parameter des Wandlers 5, in diesem Fall die Federsteifigkeit s der Membranaufhängung, über ein Steursignal 15. Die einzustellenden Parameter in Abhängigkeit der Frequenz sind in der Regeleinrichtung 4 hinterlegt. Es handelt sich hierbei somit um eine Steuerung.The control device 4 receives the reference signal 3 and determines its frequency. If the determined frequency does not correspond to the set frequency, the controller changes the parameters of the converter 5 , in this case, the spring stiffness s of the diaphragm suspension, via a Steursignal 15 , The parameters to be set as a function of the frequency are in the control device 4 deposited. It is thus a control.

Die Anpassung des elektrischen Schwingkreises durch Änderung der Kapazität 14 erfolgt über ein Steuersignal 16 der Regeleinrichtung 4.The adaptation of the electrical resonant circuit by changing the capacity 14 via a control signal 16 the control device 4 ,

Gemäß 3 ist eine weitere Ausbildung einer Anordnung ausgeführt. Hierbei erhält die Regeleinrichtung 4 zusätzlich ein Ausgangssignal 17 des Resonanzverstärkers 11 und über eine Beschleunigungsaufnahme das Schnellesignal 18 der Membran des elektroakustischen Wandlers 5.According to 3 is executed a further embodiment of an arrangement. This receives the control device 4 in addition an output signal 17 of the resonance amplifier 11 and via an acceleration recording the fast signal 18 the membrane of the electroacoustic transducer 5 ,

Anhand dieser Werte überprüft die Regeleinrichtung 4, ob die Parameter des Wandlers 5 und des Resonanzverstärkers 11 so eingestellt sind, daß der Wirkungsgrad des Gesamtsystems optimiert ist. Ändern sich beispielsweise die Frequenz des Referenzsignals 3 oder die Umbebungsbedingungen, so ist der Wirkungsgrad nicht mehr optimal und die Regeleinrichtung 4 ändert die Parameter des Wandlers 5 in Form der Federsteifigkeit der Membranaufhängung über das Steuersignal 15 und die Parameter des elektrischen Schwingkreises über die Kapazität 14 mit dem Steuersignal 16.Based on these values, the controller checks 4 whether the parameters of the converter 5 and the resonance amplifier 11 are set so that the efficiency of the overall system is optimized. For example, the frequency of the reference signal changes 3 or Umbebungsbedingungen, the efficiency is no longer optimal and the control device 4 changes the parameters of the converter 5 in the form of the spring stiffness of the diaphragm suspension via the control signal 15 and the parameters of the electrical resonant circuit over the capacity 14 with the control signal 16 ,

Claims (3)

Vorrichtung zur Schallminderung von Lärmquellen in schmalen Frequenzbereichen durch Überlagerung von Schallwellen gleicher Amplitude und Frequenz, insbesondere für Flugzeugkabinen, unter Verwendung von elektroakustischen Wandlern zum Erzeugen von Gegenschall, dadurch gekennzeichnet, daß mindestens ein Schallaufnehmer (7) zur Messung eines auftretenden Fehlersignals einer Primärschallwelle (2) der Lärmquelle (1) und einer Sekundärschallwelle (6) eines schmalbandigen elektroakustischen Wandlers (5) einer Regeleinrichtung (4) zuführbar ist, die ein Referenzsignal (3) der Lärmquelle (1) erhält sowie ein Steuersignal (15) zur Veränderung der mechanischen Werte des elektroakustischen Wandlers (5) erzeugt, wobei der elektroakustische Wandler (5) zur Veränderung der mechanischen Werte Mittel zur Änderung der Federsteifigkeit der Membranaufhängung aufweist.Device for reducing the noise of noise sources in narrow frequency ranges by superposition of sound waves of equal amplitude and frequency, in particular for aircraft cabins, using electroacoustic transducers for generating counter sound, characterized in that at least one sound sensor ( 7 ) for measuring an occurring error signal of a primary sound wave ( 2 ) of the noise source ( 1 ) and a secondary sound wave ( 6 ) of a narrow band electroacoustic transducer ( 5 ) a control device ( 4 ), which is a reference signal ( 3 ) of the noise source ( 1 ) and a control signal ( 15 ) for changing the mechanical values of the electroacoustic transducer ( 5 ), wherein the electroacoustic transducer ( 5 ) for changing the mechanical values comprises means for changing the spring stiffness of the membrane suspension. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß der elektrostatische Wandler (5) über einen Resonanzverstärker (11) ansteuerbar ist und zur Einstellung einer Betriebsfrequenz über die Regeleinrichtung (4) der gebildete Schwingkreis (12, 13, 14) über eine einstellbare Kapazität (14) anpaßbar ist.Device according to claim 1, characterized in that the electrostatic transducer ( 5 ) via a resonance amplifier ( 11 ) is controllable and for setting an operating frequency via the control device ( 4 ) the resonant circuit formed ( 12 . 13 . 14 ) via an adjustable capacity ( 14 ) is adaptable. Vorrichtung nach einem der Ansprüche 1 bis 2, dadurch gekennzeichnet, daß die Regeleinrichtung (4) mit einem erfaßten Schnellesignal (18) der Membran des elektroakustischen Wandlers (5) und ein Ausgangsignal (17) des Resonanzverstärkers (11) zusätzlich steuerbar ist.Device according to one of claims 1 to 2, characterized in that the control device ( 4 ) with a detected fast signal ( 18 ) of the membrane of the electroacoustic transducer ( 5 ) and an output signal ( 17 ) of the resonance amplifier ( 11 ) is additionally controllable.
DE102004041214A 2004-08-26 2004-08-26 Sound reduction device for noise source in aircraft cabin has electroacoustic transducer comprising suspended membrane having spring stiffness and adjustment unit arranged to change spring stiffness Expired - Fee Related DE102004041214B4 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE102004041214A DE102004041214B4 (en) 2004-08-26 2004-08-26 Sound reduction device for noise source in aircraft cabin has electroacoustic transducer comprising suspended membrane having spring stiffness and adjustment unit arranged to change spring stiffness
AT05018501T ATE554476T1 (en) 2004-08-26 2005-08-25 DEVICE AND METHOD FOR REDUCING SOUND FROM A NOISE SOURCE IN LIMITED FREQUENCY RANGES
EP05018501A EP1630788B1 (en) 2004-08-26 2005-08-25 Device and method for reducing sound of a noise source in narrow frequency ranges
US11/213,424 US7885415B2 (en) 2004-08-26 2005-08-26 Device and method for reducing sound of a noise source in narrow frequency ranges

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102004041214A DE102004041214B4 (en) 2004-08-26 2004-08-26 Sound reduction device for noise source in aircraft cabin has electroacoustic transducer comprising suspended membrane having spring stiffness and adjustment unit arranged to change spring stiffness

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DE102004041214A1 DE102004041214A1 (en) 2006-03-09
DE102004041214B4 true DE102004041214B4 (en) 2006-07-06

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DE (1) DE102004041214B4 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2832637A1 (en) 2013-07-30 2015-02-04 Airbus Operations GmbH Vibro-acoustic reduction on-board an aircraft

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006012856B4 (en) * 2006-03-21 2016-11-24 Robert Bosch Gmbh Micromechanical structure for receiving and / or generating acoustic signals and method for receiving and / or generating acoustic signals

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2814093B1 (en) * 1978-04-01 1979-08-23 Messerschmitt Boelkow Blohm Anti-noise
DE3344910C2 (en) * 1982-12-15 1994-09-29 Active Noise & Vibration Tech Arrangement for the active damping of sound waves
DE19836483A1 (en) * 1998-08-12 2000-02-17 Bosch Gmbh Robert Oscillation damping method e.g. for ferroelectric ultrasound sensor for automobile parking aid, uses feedback voltage derived from current through oscillation circuit in parallel with capacitance representing oscillating component

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2814093B1 (en) * 1978-04-01 1979-08-23 Messerschmitt Boelkow Blohm Anti-noise
DE3344910C2 (en) * 1982-12-15 1994-09-29 Active Noise & Vibration Tech Arrangement for the active damping of sound waves
DE19836483A1 (en) * 1998-08-12 2000-02-17 Bosch Gmbh Robert Oscillation damping method e.g. for ferroelectric ultrasound sensor for automobile parking aid, uses feedback voltage derived from current through oscillation circuit in parallel with capacitance representing oscillating component

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2832637A1 (en) 2013-07-30 2015-02-04 Airbus Operations GmbH Vibro-acoustic reduction on-board an aircraft

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DE102004041214A1 (en) 2006-03-09

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