EP0539939B1 - Active noise cancellation system - Google Patents

Active noise cancellation system Download PDF

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Publication number
EP0539939B1
EP0539939B1 EP92118415A EP92118415A EP0539939B1 EP 0539939 B1 EP0539939 B1 EP 0539939B1 EP 92118415 A EP92118415 A EP 92118415A EP 92118415 A EP92118415 A EP 92118415A EP 0539939 B1 EP0539939 B1 EP 0539939B1
Authority
EP
European Patent Office
Prior art keywords
noise
cancellation
sensors
generating
vehicle
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 - Lifetime
Application number
EP92118415A
Other languages
German (de)
French (fr)
Other versions
EP0539939A1 (en
Inventor
Juha Kuusama
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.)
Nokia Technology GmbH
Original Assignee
Nokia Technology GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nokia Technology GmbH filed Critical Nokia Technology GmbH
Publication of EP0539939A1 publication Critical patent/EP0539939A1/en
Application granted granted Critical
Publication of EP0539939B1 publication Critical patent/EP0539939B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • G10K11/1785—Methods, e.g. algorithms; Devices
    • G10K11/17853—Methods, e.g. algorithms; Devices of the filter
    • G10K11/17854—Methods, e.g. algorithms; Devices of the filter the filter being an adaptive filter
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1785—Methods, e.g. algorithms; Devices
    • G10K11/17857—Geometric disposition, e.g. placement of microphones
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1787—General system configurations
    • G10K11/17879—General system configurations using both a reference signal and an error signal
    • G10K11/17881—General system configurations using both a reference signal and an error signal the reference signal being an acoustic signal, e.g. recorded with a microphone
    • 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
    • G10K2210/30—Means
    • G10K2210/301—Computational
    • G10K2210/3046—Multiple acoustic inputs, multiple acoustic outputs
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/30—Means
    • G10K2210/321—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
    • G10K2210/3225—Radio or other sources used in ANC for transfer function estimation; Means to avoid interference between desired signals, e.g. from a car stereo, and the ANC signal

Definitions

  • the present invention relates to an active noise cancellation system for a vehicle having a sound reproduction system, comprising means for generating one or more electrical signal(s) proportional to the noise in the target area, an electronic means receiving these signals for generating a noise cancellation signal, one or more sound sources connected to said electronic means for generating cancellation noise in the target area.
  • active noise cancellation systems are described in FR-A-2 531 023 or Research disclosure, N° 317, Sept. 1990, p 784, Emsworth, GB, Anonymously, "An active noise controller”.
  • noise cancellation systems consist of microphones or sensors for measuring acoustic noise generated by a source, an inverting amplifier and a loudspeaker. Acoustic waves are produced by the loudspeaker to cancel the noise waves.
  • Figures 1 and 2 in the accompanying drawing illustrate the conventional system for realizing active noise cancellation in a vehicle, such as a car.
  • Figure 1 shows the apparatus components required in such an active noise cancellation system
  • Figure 2 shows the placing of the most essential of these in the vehicle.
  • a conventional active noise cancellation system of the kind shown in Figure 1 comprises first of all detection sensors 1, the purpose of which is to generate a signal proportional to the noise present in the target area.
  • these detection sensors can be, for instance, microphones.
  • the signals from these detection sensors are inputted in an electronic means 2, such as an adaptive filter, which in response to said signals being proportional to the noise in the target area generates a noise cancellation signal, which is ideally of equal amplitude but opposite phase to the noise signal, in which case the noise cancellation signal as reproduced through the sound sources 3 will cancel the noise in the target area.
  • the cancellation can be directed specifically to periodic components of noise.
  • the noise can be attenuated about 10-30 dB at the motor noise frequency.
  • the system further includes sensors 4 for residual noise, which may in practice be for instance microphones adapted to listen in the target area.
  • the means 2 for generating cancellation noise can adapt its function to afford optimum attenuation.
  • Figure 2 shows the placing of the components of the system of Figure 1 in a car.
  • the actual means 2 for generating the cancellation noise is then fitted within the door panel of the vehicle, and the loudspeakers 3 generating the cancellation noise are placed in the corners of the interior of the vehicle body.
  • the system further comprises several sensors 4 monitoring residual noise, being disposed in the upper part of the interior of the body.
  • the placing of the sensors for cancellation noise in the interior of the vehicle body constitutes a problem.
  • the placing of these sensors in such a way that they do not interfere with the other furnishings of the interior of the vehicle is very problematic, since these sensors and particularly the wiring to be brought thereto must be fitted within the upholstery of the interior, which requires rather extensive additional mounting work.
  • the object of the present invention is to provide an active noise cancellation system for a vehicle, wherein the placing of the sound sources for cancellation noise and particularly that of the sensors for residual noise does not present problems of the kind described above, but these requisite components of the active noise cancellation system can be fitted within the vehicle without any additional work being involved.
  • the noise cancellation system of the invention the first embodiment of which is characterized in that the sound sources for the generation of cancellation noise are constituted by the loudspeakers of the sound reproduction system of the vehicle, and that the sensor or at least one of the sensors for detecting residual noise is fitted in conjunction with one of said loudspeakers.
  • the noise cancellation system is again characterized in that the sound sources for generating cancellation noise are constituted by the loudspeakers of the sound reproduction system of the vehicle, and that the sensor or at least one of the sensors for detecting residual noise has been fitted in conjunction with said electronic means.
  • a sound reproduction system is installed in a normal vehicle, particularly a car, said sound reproduction system typically comprising a central unit and four loudspeakers placed approximately in the corners of the interior of the car.
  • the loudspeakers 3 of the sound reproduction system are used as sound sources generating the cancellation noise of the noise cancellation system, and the sensors 4 of residual noise are placed in the immediate vicinity of these loudspeakers for instance in the same cabinet with them.
  • the wiring of the sensors can then be drawn by the same routes as the wiring of the loudspeakers, or a single multicore cable can simply be used for both the loudspeaker and the sensor of residual noise pertaining thereto.
  • a single multicore cable can simply be used for both the loudspeaker and the sensor of residual noise pertaining thereto.
  • the fitting of these sensors does not cause any additional work as compared with the mounting of the loudspeakers of a normal sound reproduction system.
  • the means 2 for generating the cancellation noise does not directly reproduce this residual noise signal but only monitors some of its frequency components and is controlled in response thereto to generate cancellation noise which most effectively cancels noise at the frequency of noises generated for instance by the motor and tires of the vehicle.
  • each loudspeaker -- four loudspeakers being normally provided -- of the sound reproduction system By placing one sensor for residual noise in conjunction with each loudspeaker -- four loudspeakers being normally provided -- of the sound reproduction system, one can achieve a system which is fully sufficient for the detection of this residual noise signal. Further, one sensor can be placed in conjunction with the means for generating cancellation noise, which also does not require additional work from the point of view of wiring or mounting.

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  • 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)
  • Exhaust Silencers (AREA)
  • Filters That Use Time-Delay Elements (AREA)

Description

  • The present invention relates to an active noise cancellation system for a vehicle having a sound reproduction system, comprising means for generating one or more electrical signal(s) proportional to the noise in the target area, an electronic means receiving these signals for generating a noise cancellation signal, one or more sound sources connected to said electronic means for generating cancellation noise in the target area. Such active noise cancellation systems are described in FR-A-2 531 023 or Research disclosure, N° 317, Sept. 1990, p 784, Emsworth, GB, Anonymously, "An active noise controller".
  • These noise cancellation systems consist of microphones or sensors for measuring acoustic noise generated by a source, an inverting amplifier and a loudspeaker. Acoustic waves are produced by the loudspeaker to cancel the noise waves.
  • Later publications concerning noise cancellation systems describe sensors or microphones to detect residual noise in the target area transmitting it in an electric form to the inverting amplifier.
  • These publications do not describe economic integration of active noise cancellation systems into the car audio and wiring system.
  • It is therefore an object of this invention as it a defined in claim 1 to provide means to integrate active noise cancellation in an economic way into car audio and wiring systems.
  • Figures 1 and 2 in the accompanying drawing illustrate the conventional system for realizing active noise cancellation in a vehicle, such as a car. Figure 1 shows the apparatus components required in such an active noise cancellation system, and Figure 2 shows the placing of the most essential of these in the vehicle.
  • A conventional active noise cancellation system of the kind shown in Figure 1 comprises first of all detection sensors 1, the purpose of which is to generate a signal proportional to the noise present in the target area. In practice, these detection sensors can be, for instance, microphones. The signals from these detection sensors are inputted in an electronic means 2, such as an adaptive filter, which in response to said signals being proportional to the noise in the target area generates a noise cancellation signal, which is ideally of equal amplitude but opposite phase to the noise signal, in which case the noise cancellation signal as reproduced through the sound sources 3 will cancel the noise in the target area. In practice, complete cancellation is not possible for the mere reason that the means 2 for generating the cancellation noise is not able to function in real time on account of the many delays involved in the system, but must in practice predict the situation prevailing in the target area. Thus the cancellation can be directed specifically to periodic components of noise. However, in practice the noise can be attenuated about 10-30 dB at the motor noise frequency. In order that the equipment generating the cancellation noise may adjust itself to changes in the target area, the system further includes sensors 4 for residual noise, which may in practice be for instance microphones adapted to listen in the target area. On the basis of the signals generated by these sensors 4 of residual noise, the means 2 for generating cancellation noise can adapt its function to afford optimum attenuation.
  • Figure 2 shows the placing of the components of the system of Figure 1 in a car. The actual means 2 for generating the cancellation noise is then fitted within the door panel of the vehicle, and the loudspeakers 3 generating the cancellation noise are placed in the corners of the interior of the vehicle body. The system further comprises several sensors 4 monitoring residual noise, being disposed in the upper part of the interior of the body.
  • In practice, the placing of the sensors for cancellation noise in the interior of the vehicle body constitutes a problem. The placing of these sensors in such a way that they do not interfere with the other furnishings of the interior of the vehicle is very problematic, since these sensors and particularly the wiring to be brought thereto must be fitted within the upholstery of the interior, which requires rather extensive additional mounting work.
  • Thus the object of the present invention is to provide an active noise cancellation system for a vehicle, wherein the placing of the sound sources for cancellation noise and particularly that of the sensors for residual noise does not present problems of the kind described above, but these requisite components of the active noise cancellation system can be fitted within the vehicle without any additional work being involved. This is achieved with the noise cancellation system of the invention, the first embodiment of which is characterized in that the sound sources for the generation of cancellation noise are constituted by the loudspeakers of the sound reproduction system of the vehicle, and that the sensor or at least one of the sensors for detecting residual noise is fitted in conjunction with one of said loudspeakers.
  • The noise cancellation system according to a second embodiment of the invention is again characterized in that the sound sources for generating cancellation noise are constituted by the loudspeakers of the sound reproduction system of the vehicle, and that the sensor or at least one of the sensors for detecting residual noise has been fitted in conjunction with said electronic means.
  • The noise cancellation system of the invention will be described in more detail in the following, with reference to the enclosed drawing wherein
    • Figure 1 represents schematically the construction of the noise cancellation system,
    • Figure 2 represents an arrangement according to the prior art for disposing the components of the noise cancellation system in the vehicle, and
    • Figure 3 represents a solution according to the invention for disposing the components of the noise cancellation system in the vehicle.
  • In accordance with the invention, it has been realized that almost invariably a sound reproduction system is installed in a normal vehicle, particularly a car, said sound reproduction system typically comprising a central unit and four loudspeakers placed approximately in the corners of the interior of the car. By using these loudspeakers and their wiring routes which are part of the normal outfit of the vehicle, one can also realize the noise cancellation system of the invention. Therein the loudspeakers 3 of the sound reproduction system are used as sound sources generating the cancellation noise of the noise cancellation system, and the sensors 4 of residual noise are placed in the immediate vicinity of these loudspeakers for instance in the same cabinet with them. The wiring of the sensors can then be drawn by the same routes as the wiring of the loudspeakers, or a single multicore cable can simply be used for both the loudspeaker and the sensor of residual noise pertaining thereto. Thus the fitting of these sensors does not cause any additional work as compared with the mounting of the loudspeakers of a normal sound reproduction system.
  • Even though the sensors for residual noise are placed very close to the loudspeakers 3 generating the cancellation noise, this does not present a problem. The means 2 for generating the cancellation noise does not directly reproduce this residual noise signal but only monitors some of its frequency components and is controlled in response thereto to generate cancellation noise which most effectively cancels noise at the frequency of noises generated for instance by the motor and tires of the vehicle.
  • By placing one sensor for residual noise in conjunction with each loudspeaker -- four loudspeakers being normally provided -- of the sound reproduction system, one can achieve a system which is fully sufficient for the detection of this residual noise signal. Further, one sensor can be placed in conjunction with the means for generating cancellation noise, which also does not require additional work from the point of view of wiring or mounting.

Claims (1)

  1. An active noise cancellation system for a vehicle having a sound reproduction system, comprising means (1) for generating one or more electric signals proportional to the noise in the target area, an electronic means (2) receiving these signals for generating a noise cancellation signal, one or more sound sources connected to said electronic means (2) for generating cancellation noise in the target area, and one or more sensors (4) for detecting residual noise in the target area and transmitting it in an electric form to the electronic means (2) to tune its operation,
    characterized in that the sound sources for the generation of cancellation noise are constituted by loudspeakers (3) of the sound reproduction system of the vehicle, and in that the sensor or at least one of the sensors (4) for detecting residual noise is fitted in conjunction with one of said loudspeakers (3) and / or said electronic means (2).
EP92118415A 1991-10-31 1992-10-28 Active noise cancellation system Expired - Lifetime EP0539939B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI915142 1991-10-31
FI915142A FI915142A (en) 1991-10-31 1991-10-31 Active bull training system

Publications (2)

Publication Number Publication Date
EP0539939A1 EP0539939A1 (en) 1993-05-05
EP0539939B1 true EP0539939B1 (en) 1997-04-23

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Application Number Title Priority Date Filing Date
EP92118415A Expired - Lifetime EP0539939B1 (en) 1991-10-31 1992-10-28 Active noise cancellation system

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EP (1) EP0539939B1 (en)
JP (1) JP2740091B2 (en)
DE (1) DE69219273T2 (en)
FI (1) FI915142A (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3613801B2 (en) * 1992-09-29 2005-01-26 マツダ株式会社 Vehicle vibration reduction device
WO1996011466A1 (en) * 1994-10-06 1996-04-18 Duke University Feedback acoustic energy dissipating device with compensator
DE10025496C2 (en) 2000-05-23 2003-04-10 Daimler Chrysler Ag Audio system, in particular for motor vehicles
US8045725B2 (en) * 2009-04-16 2011-10-25 GM Global Technology Operations LLC Vehicle interior active noise cancellation
US9245519B2 (en) 2013-02-15 2016-01-26 Bose Corporation Forward speaker noise cancellation in a vehicle
DE102016116320A1 (en) * 2016-09-01 2018-03-01 Knorr-Bremse Gesellschaft Mit Beschränkter Haftung Method and device for modifying a sound emission of an entry-level system for a rail vehicle, boarding system and rail vehicle
JP2018118621A (en) * 2017-01-25 2018-08-02 パナソニックＩｐマネジメント株式会社 Active noise reduction device, vehicle, and abnormality determination method

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3889058A (en) * 1969-01-15 1975-06-10 Ard Anstalt Telephone systems with reduced acoustic feedback
FR2531023B1 (en) * 1982-08-02 1987-04-30 Peugeot NOISE MITIGATION DEVICE IN THE INTERIOR OF A MOTOR VEHICLE
SE452442B (en) * 1986-12-23 1987-11-30 Saab Scania Ab SEALING DEVICE FOR TRANSMISSION OF ONE OF MULTIPLE CIRCULATIONS EXISTING CONNECTION CIRCUIT THROUGH AN OPENING IN A VEHICLE
JPH0212947U (en) * 1988-07-08 1990-01-26
JP2781193B2 (en) * 1989-02-25 1998-07-30 カルソニック株式会社 Active noise canceller
JPH03203792A (en) * 1989-12-29 1991-09-05 Nissan Motor Co Ltd Active noise controller

Also Published As

Publication number Publication date
DE69219273D1 (en) 1997-05-28
JP2740091B2 (en) 1998-04-15
FI915142A (en) 1993-05-01
EP0539939A1 (en) 1993-05-05
JPH07306683A (en) 1995-11-21
DE69219273T2 (en) 1997-11-20
FI915142A0 (en) 1991-10-31

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