EP0457176A2 - Active noise reduction system for the interior of motor vehicles - Google Patents

Active noise reduction system for the interior of motor vehicles Download PDF

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Publication number
EP0457176A2
EP0457176A2 EP91107463A EP91107463A EP0457176A2 EP 0457176 A2 EP0457176 A2 EP 0457176A2 EP 91107463 A EP91107463 A EP 91107463A EP 91107463 A EP91107463 A EP 91107463A EP 0457176 A2 EP0457176 A2 EP 0457176A2
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EP
European Patent Office
Prior art keywords
field
noise reduction
reduction system
active noise
far
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Granted
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EP91107463A
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German (de)
French (fr)
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EP0457176A3 (en
EP0457176B1 (en
Inventor
Bernhard Dipl.-Ing. Lange
Klaus Dr.-Ing. Hieronimus
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Adam Opel GmbH
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Adam Opel GmbH
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    • 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
    • G10K11/1783—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 handling or detecting of non-standard events or conditions, e.g. changing operating modes under specific operating conditions
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1781—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions
    • G10K11/17821—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions characterised by the analysis of the input signals only
    • G10K11/17823—Reference signals, e.g. ambient acoustic environment
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1785—Methods, e.g. algorithms; Devices
    • G10K11/17857—Geometric disposition, e.g. placement of microphones
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1787—General system configurations
    • G10K11/17879—General system configurations using both a reference signal and an error signal
    • G10K11/17883—General system configurations using both a reference signal and an error signal the reference signal being derived from a machine operating condition, e.g. engine RPM or vehicle speed
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/10—Applications
    • G10K2210/103—Three dimensional
    • 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
    • G10K2210/10—Applications
    • G10K2210/128—Vehicles
    • G10K2210/1282—Automobiles
    • G10K2210/12821—Rolling noise; Wind and body noise
    • 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
    • G10K2210/3217—Collocated sensor and cancelling actuator, e.g. "virtual earth" designs
    • 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
    • G10K2210/3221—Headrests, seats or the like, for personal ANC systems
    • 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
    • G10K2210/32272—Helmholtz resonators

Definitions

  • the invention relates to an active noise reduction system for the interior of motor vehicles and other means of transport with at least one noise sensor or microphone, at least one loudspeaker and at least one control device which receives the output signal of the noise sensor or microphone as an actual variable and emits an actuating signal acting on the loudspeaker, the spatial Distance between speaker and microphone can be relatively small ("near field”) or large (“far field”).
  • a noise reduction system for motor vehicles is known from EP 0 342 353, in which the microphones are arranged in a Helmholtz resonator.
  • the loudspeakers are located at locations of maximum sound pressure such as in the front area of the foot or the parcel shelf.
  • the Helmholtz resonator is tuned to the natural gas frequency to be damped.
  • control devices of the generic type derive a reference signal from the ignition frequency of the internal combustion engine via a sensor, with which a compensation of the sound field structure is to be effected.
  • the known systems have in common that the radiation of very low frequencies requires relatively large loudspeakers, and at higher frequencies (from 150 Hz) a large number of loudspeakers are required or advantageous close to the ears. The cost and computational effort increase accordingly. The electrical stability of the control loop becomes more problematic.
  • This object is achieved in that there are at least two subsystems, each with at least one noise sensor or microphone and a loudspeaker, one for the "near field” and one for the "far field", that the frequencies to be processed by the control device for the near field lie above and for the far field below a characteristic cut-off frequency f g , and that at least one specific interior area is affected both by the near field method and by the far field method.
  • the frequency bands formed by the cut-off frequency f g partially overlap and dominate in the frequency overlap area that system which can work more effectively in accordance with the sound field structure.
  • the frequency band assigned to the far field or near field method can be narrowband or broadband or vice versa.
  • the two subsystems working according to the near field or far field method can either work independently of one another and can only be coupled to one another via the sound field to be reduced, or can use a common control unit or also have their own control units that are coupled to one another.
  • the noise reduction system according to the invention has the significant advantage that it leads to better compensation in terms of control technology and works effectively with fewer components and is less susceptible to faults with regard to the stability of the control loop.
  • the schematic active noise reduction system shown in FIG. 1 is composed of several components: 1a and 2a are microphones or loudspeakers for the far field, while 1b and 2b represent microphones or loudspeakers for the near field.
  • 3 denotes the electronic control unit of the active noise reduction unit ANC (Active Noise Control), which can be arranged, for example, in the housing 4 of a car radio.
  • Reference number 5 denotes a tachometer sensor from which a reference signal proportional to the ignition frequency can be derived in order to generate a reference signal for the ANC (Active Noise Control).
  • the loudspeakers or microphones intended for far-field compensation are spatially relatively far apart, for example in that the loudspeakers are arranged in the lower foot area for the front and rear seats and on the parcel shelf, while the corresponding microphones can be arranged in the upper head area from the dashboard height and above.
  • the loudspeakers and corresponding microphones are spaced relatively close and are arranged in the vicinity of the head of, for example, the driver or front passenger or the rear passengers in the area of the headrests or door pillars. With this arrangement, the upper area of the Passenger space after the far field and the area of the driver or passenger or the area of the rear passengers additionally influenced by the near field method.
  • the active noise reduction system (ANC) for the interior of motor vehicles divides the frequencies to be processed into two frequency bands, which are distinguished from one another by a characteristic cut-off frequency f g .
  • the characteristic for the far field frequency band A0 (Fig. 2) is below, the characteristic for the near field frequency band B0 above a cutoff frequency of 100 to 400 Hz.
  • the two frequency bands A1, B1 (Fig. 3) can partially overlap.
  • the electronic control and regulating unit for the near or far field preferably consists of a signal processor that influences both fields together, the two subsystems being coupled via decentralized interactive logics and both working digitally or analogously or partly digitally and partly analogly.
  • the noise reduction system according to the invention can also be used, for example, in motor vehicles. B. in airplanes and other means of transport, wherever unrolling, strong wind and engine noise occur.

Abstract

The invention relates to an active noise reduction system for the interior of motor vehicles and other means of transport, having noise sensors (microphones) (1a, 1b), loudspeakers (2a, 2b) and at least one control device (3) which contains the output signal of the noise sensors as an actual variable and emits control signals which act on the loudspeakers, the noise-reduced spatial area being under the influence of two or more differently acting subsystems. In these subsystems, the spatial distance between loudspeaker and microphone is relatively small (1b, 2b) (''near field'') or large (1a, 2a) (''far field''). The frequencies for the near field which are to be processed by the control device (3) are above a characteristic threshold frequency fg and those for the far field are below said threshold frequency. The two subsystems are complementary in their mode of operation in accordance with the vehicle conditions. <IMAGE>

Description

Die Erfindung betrifft ein aktives Geräuschminderungssystem für den Innenraum von Kraftfahrzeugen und anderen Verkehrsmitteln mit mindestens einem Geräuschsensor oder Mikrofon, mindestens einem Lautsprecher und mindestens einer Regeleinrichtung, die als Istgröße das Ausgangssignal des Geräuschsensors oder Mikrofons erhält und ein den Lautsprecher beaufschlagendes Stellsignal abgibt, wobei der räumliche Abstand zwischen Lautsprecher und Mikrofon relativ klein ("Nahfeld") bzw. groß ("Fernfeld") sein kann.The invention relates to an active noise reduction system for the interior of motor vehicles and other means of transport with at least one noise sensor or microphone, at least one loudspeaker and at least one control device which receives the output signal of the noise sensor or microphone as an actual variable and emits an actuating signal acting on the loudspeaker, the spatial Distance between speaker and microphone can be relatively small ("near field") or large ("far field").

Aus der EP 0 342 353 ist ein Geräuschminderungssystem für Kraftfahrzeuge bekannt, bei dem die Mikrofone in einem Helmholtz-Resonator angeordnet sind. Die Lautsprecher befinden sich dabei an Orten maximalen Schalldruckes wie im vorderen Fußbereich oder der Hutablage. Der Helmholtz-Resonator ist dabei auf die zu dämpfende Kohlraumeigenfrequenz abgestimmt.A noise reduction system for motor vehicles is known from EP 0 342 353, in which the microphones are arranged in a Helmholtz resonator. The loudspeakers are located at locations of maximum sound pressure such as in the front area of the foot or the parcel shelf. The Helmholtz resonator is tuned to the natural gas frequency to be damped.

Weitere bekannte Regeleinrichtungen der gattungsmäßigen Art leiten aus der Zündfrequenz der Brennkraftmaschine über einen Sensor ein Referenzsignal ab, mit dem eine Kompensation der Schallfeldstruktur bewirkt werden soll.Further known control devices of the generic type derive a reference signal from the ignition frequency of the internal combustion engine via a sensor, with which a compensation of the sound field structure is to be effected.

Den bekannten Systemen ist gemeinsam, daß die Abstrahlung sehr tiefer Frequenzen relativ große Lautsprecher erforderlich macht, und bei höheren Frequenzen (ab 150 Hz) sind sehr viele Lautsprecher erforderlich bzw. in Ohrennähe vorteilhaft. Entsprechend wächst der Kosten- und Rechenaufwand. Die elektrische Stabilität des Regelkreises wird problematischer.The known systems have in common that the radiation of very low frequencies requires relatively large loudspeakers, and at higher frequencies (from 150 Hz) a large number of loudspeakers are required or advantageous close to the ears. The cost and computational effort increase accordingly. The electrical stability of the control loop becomes more problematic.

Daher liegt der vorliegenden Erfindung die Aufgabe zugrunde, ein Frequenzkompensationssystem anzugeben, das kostengünstiger und technisch praktikabler handhabbar ist.It is therefore the object of the present invention to provide a frequency compensation system which can be handled more economically and more technically.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß mindestens zwei Teilsysteme mit jeweils mindestens einem Geräuschsensor oder Mikrofon und einem Lautsprecher, je eines für das "Nahfeld" und eines für das "Fernfeld" vorhanden sind, daß die von der Regeleinrichtung zu verarbeitenden Frequenzen für das Nahfeld oberhalb und für das Fernfeld unterhalb einer charakteristischen Grenzfrequenz fg liegen, und daß auf mindestens einen bestimmten Innenraumbereich sowohl nach dem Nahfeldverfahren als auch nach dem Fernfeldverfahren eingewirkt wird.This object is achieved in that there are at least two subsystems, each with at least one noise sensor or microphone and a loudspeaker, one for the "near field" and one for the "far field", that the frequencies to be processed by the control device for the near field lie above and for the far field below a characteristic cut-off frequency f g , and that at least one specific interior area is affected both by the near field method and by the far field method.

In einer weiteren vorteilhaften Ausgestaltung kann vorgesehen sein, daß die durch die Grenzfrequenz fg gebildeten Frequenzbänder teilweise überlappen und im Frequenzüberlappungsbereich dasjenige System dominiert, das entsprechend der Schallfeldstruktur wirkungsvoller arbeiten kann. Das dem Fernfeld- bzw. Nahfeldverfahren zugeordnete Frequenzband kann schmalbandig bzw. breitbandig sein oder umgekehrt.In a further advantageous embodiment it can be provided that the frequency bands formed by the cut-off frequency f g partially overlap and dominate in the frequency overlap area that system which can work more effectively in accordance with the sound field structure. The frequency band assigned to the far field or near field method can be narrowband or broadband or vice versa.

Dabei können die beiden nach Nah- bzw. Fernfeldverfahren arbeitenden Teilsysteme entweder unabhängig voneinander arbeiten und nur über das zu mindernde Schallfeld miteinander gekoppelt sein oder aber eine gemeinsame Regeleinheit benutzen oder auch jeweils eigene, aber untereinander gekoppelte Regeleinheiten besitzen.The two subsystems working according to the near field or far field method can either work independently of one another and can only be coupled to one another via the sound field to be reduced, or can use a common control unit or also have their own control units that are coupled to one another.

Das erfindungsgemäße Geräuschminderungssystem hat den wesentlichen Vorteil, daß es vom regelungstechnischen Aufwand her zu besserer Kompensation führt und mit weniger Komponenten wirkungsvoll arbeitet und weniger störanfällig ist hinsichtlich der Stabilität des Regelkreises.The noise reduction system according to the invention has the significant advantage that it leads to better compensation in terms of control technology and works effectively with fewer components and is less susceptible to faults with regard to the stability of the control loop.

Die Erfindung wird im folgenden anhand schematischer Zeichnungen und eines Ausführungsbeispieles näher erläutert.
Es zeigen:

Fig. 1
die Schallbeeinflussung des Fahrgastinnenraumes entsprechend der Ausführung Nahfeld - Fernfeld,
Fig. 2
das Frequenzband für Nah- bzw. Fernfeld,
Fig. 3
das Frequenzband mit Überlappungsbereich.
The invention is explained in more detail below with the aid of schematic drawings and an exemplary embodiment.
Show it:
Fig. 1
the sound influencing of the passenger interior in accordance with the near field - far field version,
Fig. 2
the frequency band for near or far field,
Fig. 3
the frequency band with overlap area.

Das in Figur 1 dargestellte schematische aktive Geräuschminderungssystem setzt sich aus mehreren Komponenten zusammen: 1a und 2a sind Mikrofone bzw. Lautsprecher für den Fernfeldbereich, während 1b und 2b Mikrofone bzw. Lautsprecher für den Nahfeldbereich darstellen. Mit 3 ist die elektronische Regeleinheit der aktiven Geräuschminderungseinheit ANC (Active Noise Control) gekennzeichnet, die beispielsweise im Gehäuse 4 eines Autoradios angeordnet sein kann. Die Bezugsziffer 5 bezeichnet einen Tacho-Sensor, aus dem ein Referenzsignal proportional der Zündfrequenz abgeleitet werden kann, um ein Bezugssignal für die ANC (Active Noise Control) zu generieren.The schematic active noise reduction system shown in FIG. 1 is composed of several components: 1a and 2a are microphones or loudspeakers for the far field, while 1b and 2b represent microphones or loudspeakers for the near field. 3 denotes the electronic control unit of the active noise reduction unit ANC (Active Noise Control), which can be arranged, for example, in the housing 4 of a car radio. Reference number 5 denotes a tachometer sensor from which a reference signal proportional to the ignition frequency can be derived in order to generate a reference signal for the ANC (Active Noise Control).

Die für die Fernfeldkompensation vorgesehenen Lautsprecher bzw. Mikrofone sind räumlich zueinander relativ weit beabstandet, indem die Lautsprecher beispielsweise im unteren Fußbereich für Vorder- und Rücksitz und auf der Hutablage angeordnet sind, während die korrespondierenden Mikrofone im oberen Kopfbereich ab Armaturentafelhöhe und darüber angeordnet sein können. Für den Nahfeldbereich sind die Lautsprecher und korrespondierenden Mikrofone relativ nah beabstandet und in Kopfnähe von beispielsweise Fahrer bzw. Beifahrer oder den Fondpassagieren im Bereich der Kopfstützen bzw. Türholme angeordnet. Durch diese Anordnung wird der obere Bereich des Passagierraums nach dem Fernfeld- und der Bereich des Fahrers bzw. Beifahrers respektive der Bereich der Fondpassagiere zusätzlich nach dem Nahfeldverfahren beeinflußt.The loudspeakers or microphones intended for far-field compensation are spatially relatively far apart, for example in that the loudspeakers are arranged in the lower foot area for the front and rear seats and on the parcel shelf, while the corresponding microphones can be arranged in the upper head area from the dashboard height and above. For the near field, the loudspeakers and corresponding microphones are spaced relatively close and are arranged in the vicinity of the head of, for example, the driver or front passenger or the rear passengers in the area of the headrests or door pillars. With this arrangement, the upper area of the Passenger space after the far field and the area of the driver or passenger or the area of the rear passengers additionally influenced by the near field method.

Das erfindungsgemäße aktive Geräuschminderungssystem (ANC) für den Innenraum von Kraftfahrzeugen teilt die zu verarbeitenden Frequenzen in zwei Frequenzbänder ein, die durch eine charakteristische Grenzfrequenz fg voneinander unterschieden werden. Das für das Fernfeld charakteristische Frequenzband A₀ (Fig. 2) liegt unterhalb, das für das Nahfeld charakteristische Frequenzband B₀ oberhalb einer Grenzfrequenz von 100 bis 400 Hz. Im Bereich der Grenzfrequenz fg können die beiden Frequenzbänder A₁, B₁ (Fig. 3) teilweise überlappen.The active noise reduction system (ANC) according to the invention for the interior of motor vehicles divides the frequencies to be processed into two frequency bands, which are distinguished from one another by a characteristic cut-off frequency f g . The characteristic for the far field frequency band A₀ (Fig. 2) is below, the characteristic for the near field frequency band B₀ above a cutoff frequency of 100 to 400 Hz. In the range of the cutoff frequency f g , the two frequency bands A₁, B₁ (Fig. 3) can partially overlap.

Die elektronische Kontroll- und Regeleinheit für Nah- bzw. Fernfeld besteht vorzugsweise aus einem Signalprozessor, der beide Felder gemeinsam beeinflußt, wobei die beiden Teilsysteme über dezentrale interaktive Logiken gekoppelt sind und beide digital oder analog oder zum Teil digital und zum Teil analog arbeiten.The electronic control and regulating unit for the near or far field preferably consists of a signal processor that influences both fields together, the two subsystems being coupled via decentralized interactive logics and both working digitally or analogously or partly digitally and partly analogly.

Das erfindungsgemäße Geräuschminderungssystem läßt sich außer in Kraftfahrzeugen auch z. B. in Flugzeugen und anderen Verkehrsmitteln, überall dort, wo Abroll-, starke Wind- und Antriebsmaschinengeräusche entstehen, einsetzen.The noise reduction system according to the invention can also be used, for example, in motor vehicles. B. in airplanes and other means of transport, wherever unrolling, strong wind and engine noise occur.

Claims (10)

Aktives Geräuschminderungssystem für den Innenraum von Kraftfahrzeugen und anderen Verkehrsmitteln mit mindestens einem Geräuschsensor oder Mikrofon, mindestens einem Lautsprecher und mindestens einer Regeleinrichtung, die als Istgröße das Ausgangssignal des Geräuschsensors oder Mikrofons erhält und ein den Lautsprecher beaufschlagendes Stellsignal abgibt, wobei der räumliche Abstand zwischen Lautsprecher und Mikrofon relativ klein ("Nahfeld") bzw. groß ("Fernfeld") sein kann, dadurch gekennzeichnet, daß mindestens zwei Teilsysteme mit jeweils mindestens einem Geräuschsensor oder Mikrofon und einem Lautsprecher, je eines für das "Nahfeld" und eines für das "Fernfeld" vorhanden sind, daß die von der Regeleinrichtung zu verarbeitenden Frequenzen für das Nahfeld oberhalb und für das Fernfeld unterhalb einer charakteristischen Grenzfrequenz (fg) liegen, und daß auf mindestens einen bestimmten Innenraumbereich sowohl nach dem Nahfeldverfahren als auch nach dem Fernfeldverfahren eingewirkt wird.Active noise reduction system for the interior of motor vehicles and other means of transport with at least one noise sensor or microphone, at least one loudspeaker and at least one control device, which receives the output signal of the noise sensor or microphone as an actual variable and emits an actuating signal that acts on the loudspeaker, the spatial distance between loudspeaker and Microphone can be relatively small ("near field") or large ("far field"), characterized in that at least two subsystems, each with at least one noise sensor or microphone and a loudspeaker, one for the "near field" and one for the "far field""are present that the frequencies to be processed by the control device for the near field are above and for the far field below a characteristic cut-off frequency (f g ), and that on at least one specific interior area both according to the near field method and according to the far field driving is affected. Aktives Geräuschminderungssystem nach Anspruch 1, dadurch gekennzeichnet, daß die Grenzfrequenz (fg) zwischen 100 und 400 Hz liegt.The active noise reduction system according to claim 1, characterized in that the limit frequency (f g) is between 100 and 400 Hz. Aktives Geräuschminderungssystem nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Frequenzbereiche von Nah- und Fernfeld teilweise überlappen.Active noise reduction system according to claim 1 or 2, characterized in that the frequency ranges of near and far fields partially overlap. Aktives Geräuschminderungssystem nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß der obere Bereich des Passagierraums des Kraftfahrzeuges in Kopfhöhe aller Passagiere nach dem Fernfeldverfahren und der Bereich des Fahrers bzw. Beifahrers auf den Vordersitzen zusätzlich nach dem Nahfeldverfahren beeinflußt wird.Active noise reduction system according to one of the preceding claims, characterized in that the upper area of the passenger compartment of the motor vehicle at head height of all passengers is influenced by the far field method and the area of the driver or front passenger on the front seats is additionally influenced by the near field method. Aktives Geräuschminderungssystem nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß im Frequenzüberlappungsbereich dasjenige System dominiert, das entsprechend der Schallfeldstruktur wirkungsvoller arbeiten kann.Active noise reduction system according to one of the preceding claims, characterized in that in the frequency overlap area that system dominates which can work more effectively in accordance with the sound field structure. Aktives Geräuschminderungssystem nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß das Fernfeldverfahren schmalbandig und das Nahfeldverfahren breitbandig wirkt.Active noise reduction system according to one of Claims 1 to 5, characterized in that the far-field method has a narrow-band effect and the near-field method has a broad-band effect. Aktives Geräuschminderungssystem nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß das Fernfeldverfahren breitbandig und das Nahfeldverfahren schmalbandig wirkt.Active noise reduction system according to one of claims 1 to 5, characterized in that the far-field method acts broadband and the near-field method acts narrowband. Aktives Geräuschminderungssystem nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß beide nach Nah- bzw. Fernfeldverfahren arbeitenden Teilsysteme unabhängig voneinander arbeiten und nur über das zu mindernde Schallfeld miteinander gekoppelt sind.Active noise reduction system according to one of the preceding claims, characterized in that the two subsystems operating according to the near or far field methods work independently of one another and are coupled to one another only via the sound field to be reduced. Aktives Geräuschminderungssystem nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß beide nach Nah- bzw. Fernfeldverfahren arbeitenden Teilsysteme über eine gemeinsame Regeleinheit (Signalprozessor) das Schallfeld mindern.Active noise reduction system according to one of the preceding claims, characterized in that both subsystems working according to near or far field methods reduce the sound field via a common control unit (signal processor). Aktives Geräuschminderungssystem nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß die beiden nach Fern- bzw. Nahfeldverfahren arbeitenden Teilsysteme über dezentrale, interaktive Logiken gekoppelt sind und beide digital oder analog oder zum Teil digital und zum Teil analog arbeiten.Active noise reduction system according to one of the preceding claims, characterized in that the two subsystems working according to far or near field methods are coupled via decentralized, interactive logics and both work digitally or analogously or partly digitally and partly analogly.
EP91107463A 1990-05-12 1991-05-08 Active noise reduction system for the interior of motor vehicles Expired - Lifetime EP0457176B1 (en)

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DE4015313A DE4015313A1 (en) 1990-05-12 1990-05-12 ACTIVE NOISE REDUCTION SYSTEM FOR THE INTERIOR OF MOTOR VEHICLES
DE4015313 1990-05-12

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EP0457176A2 true EP0457176A2 (en) 1991-11-21
EP0457176A3 EP0457176A3 (en) 1992-09-02
EP0457176B1 EP0457176B1 (en) 1995-10-11

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WO2007115875A1 (en) * 2006-04-10 2007-10-18 Robert Bosch Gmbh Airborne sound reproduction arrangement

Also Published As

Publication number Publication date
DE4015313C2 (en) 1993-02-25
EP0457176A3 (en) 1992-09-02
DE4015313A1 (en) 1991-11-14
DE59106641D1 (en) 1995-11-16
EP0457176B1 (en) 1995-10-11

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