WO1994011953A3 - Active noise cancellation system - Google Patents

Active noise cancellation system Download PDF

Info

Publication number
WO1994011953A3
WO1994011953A3 PCT/US1993/010958 US9310958W WO9411953A3 WO 1994011953 A3 WO1994011953 A3 WO 1994011953A3 US 9310958 W US9310958 W US 9310958W WO 9411953 A3 WO9411953 A3 WO 9411953A3
Authority
WO
WIPO (PCT)
Prior art keywords
transducer
signal
produce
bilateral
cancellation system
Prior art date
Application number
PCT/US1993/010958
Other languages
French (fr)
Other versions
WO1994011953A9 (en
WO1994011953A2 (en
Inventor
Chris Todter
Scott Clifton
Paul Bremner
Original Assignee
Noise Buster Technology
Chris Todter
Scott Clifton
Paul Bremner
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 Noise Buster Technology, Chris Todter, Scott Clifton, Paul Bremner filed Critical Noise Buster Technology
Priority to AU62952/94A priority Critical patent/AU6295294A/en
Priority to US08/446,589 priority patent/US5862234A/en
Publication of WO1994011953A2 publication Critical patent/WO1994011953A2/en
Publication of WO1994011953A3 publication Critical patent/WO1994011953A3/en
Publication of WO1994011953A9 publication Critical patent/WO1994011953A9/en

Links

Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1785—Methods, e.g. algorithms; Devices
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1787—General system configurations
    • G10K11/17875—General system configurations using an error signal without a reference signal, e.g. pure feedback
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • 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
    • G10K2210/108—Communication systems, e.g. where useful sound is kept and noise is cancelled
    • G10K2210/1082—Microphones, e.g. systems using "virtual" 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
    • 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
    • G10K2210/3011—Single acoustic input
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/30—Means
    • G10K2210/301—Computational
    • G10K2210/3045—Multiple acoustic inputs, single acoustic output
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/30—Means
    • G10K2210/321—Physical
    • G10K2210/3217—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
    • G10K2210/3229—Transducers

Abstract

A bilateral transducer (18) for use in an active noise cancellation system both senses ambient noise and produces acoustic waves to cancel the noise. The electrical interface for each bilateral transducer circuit consists of a speaker drive signal as an input and a simulated microphone signal as an output. In a first embodiment, the drive signal to the bilateral transducer is periodically turned off at a rate above audibility, and in the 'off period' the transducer's drive element is sensed to produce a reverse output signal from which is subtracted a synthesized signal representing the speaker velocity response to the drive signal to produce the simulated microphone signal. In further embodiments, the reverse output signal is derived by sensing the energy being sent to the transducer to produce the acoustic waves, or by a separate sensing coil in a coil driven transducer.
PCT/US1993/010958 1992-11-11 1993-11-12 Active noise cancellation system WO1994011953A2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU62952/94A AU6295294A (en) 1992-11-11 1993-11-12 Active noise cancellation system
US08/446,589 US5862234A (en) 1992-11-11 1993-11-12 Active noise cancellation system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPL579292 1992-11-11
AUPL5792 1992-11-11

Publications (3)

Publication Number Publication Date
WO1994011953A2 WO1994011953A2 (en) 1994-05-26
WO1994011953A3 true WO1994011953A3 (en) 1994-07-07
WO1994011953A9 WO1994011953A9 (en) 1994-08-18

Family

ID=3776539

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1993/010958 WO1994011953A2 (en) 1992-11-11 1993-11-12 Active noise cancellation system

Country Status (1)

Country Link
WO (1) WO1994011953A2 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5848169A (en) * 1994-10-06 1998-12-08 Duke University Feedback acoustic energy dissipating device with compensator
DE19735450C1 (en) * 1997-08-16 1999-03-11 Bosch Gmbh Robert Method for inputting acoustic signals into an electrical device and electrical device
US6717537B1 (en) 2001-06-26 2004-04-06 Sonic Innovations, Inc. Method and apparatus for minimizing latency in digital signal processing systems
JP2006523058A (en) * 2003-04-08 2006-10-05 コーニンクレッカ　フィリップス　エレクトロニクス　エヌ　ヴィ Method and apparatus for reducing interference noise signal portion in microphone signal
US20050136848A1 (en) * 2003-12-22 2005-06-23 Matt Murray Multi-mode audio processors and methods of operating the same
EP2384023A1 (en) * 2010-04-28 2011-11-02 Nxp B.V. Using a loudspeaker as a vibration sensor
EP2387251B1 (en) * 2010-05-11 2013-07-17 Nxp B.V. Sound reproduction and detection
CN114333755A (en) * 2022-03-17 2022-04-12 滨州学院 Intelligent monitoring and noise reduction device and method for in-car noise in automobile running

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4243839A (en) * 1977-12-14 1981-01-06 Matsushita Electric Industrial Co., Ltd. Transducer with flux sensing coils
US4985925A (en) * 1988-06-24 1991-01-15 Sensor Electronics, Inc. Active noise reduction system
US5267321A (en) * 1991-11-19 1993-11-30 Edwin Langberg Active sound absorber

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4243839A (en) * 1977-12-14 1981-01-06 Matsushita Electric Industrial Co., Ltd. Transducer with flux sensing coils
US4985925A (en) * 1988-06-24 1991-01-15 Sensor Electronics, Inc. Active noise reduction system
US5267321A (en) * 1991-11-19 1993-11-30 Edwin Langberg Active sound absorber

Also Published As

Publication number Publication date
WO1994011953A2 (en) 1994-05-26

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