ATE82083T1 - ARRANGEMENTS FOR NOISE REDUCTION. - Google Patents

ARRANGEMENTS FOR NOISE REDUCTION.

Info

Publication number
ATE82083T1
ATE82083T1 AT88905991T AT88905991T ATE82083T1 AT E82083 T1 ATE82083 T1 AT E82083T1 AT 88905991 T AT88905991 T AT 88905991T AT 88905991 T AT88905991 T AT 88905991T AT E82083 T1 ATE82083 T1 AT E82083T1
Authority
AT
Austria
Prior art keywords
noise reduction
microphone
low frequency
sound generator
arrangements
Prior art date
Application number
AT88905991T
Other languages
German (de)
Inventor
Robert Christopher Twiney
Anthony John Salloway
Original Assignee
Siemens Plessey Electronic
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
Priority claimed from GB878717040A external-priority patent/GB8717040D0/en
Priority claimed from GB878717043A external-priority patent/GB8717043D0/en
Priority claimed from GB878717042A external-priority patent/GB8717042D0/en
Application filed by Siemens Plessey Electronic filed Critical Siemens Plessey Electronic
Application granted granted Critical
Publication of ATE82083T1 publication Critical patent/ATE82083T1/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
    • G10K11/17853—Methods, e.g. algorithms; Devices of the 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
    • G10K11/1781—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
    • G10K11/1787—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
    • G10K11/17885—General system configurations additionally using a desired external signal, e.g. pass-through audio such as music or speech
    • 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
    • G10K2210/1081—Earphones, e.g. for telephones, ear protectors or headsets
    • 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
    • G10K2210/3028—Filtering, e.g. Kalman filters or special analogue or digital filters
    • 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
    • G10K2210/3039—Nonlinear, e.g. clipping, numerical truncation, thresholding or variable input and output gain
    • 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

Landscapes

  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Audiology, Speech & Language Pathology (AREA)
  • General Health & Medical Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Electroluminescent Light Sources (AREA)
  • Gas-Filled Discharge Tubes (AREA)
  • Noise Elimination (AREA)
  • Exhaust Silencers (AREA)
  • Networks Using Active Elements (AREA)

Abstract

Active noise reduction systems. In order to overcome problems in an active noise reduction system of sound buffets at low frequency and signal enhancement caused by imperfect transfer functions of a noise cancelling sound generator and a microphone, one or more high pass filters for reducing low frequency signals are provided in a feedback loop between the sound generator and microphone. A low pass filter is provided for extending the bandwidth of the system but which does not introduce unduly large phase shifts.
AT88905991T 1987-07-20 1988-07-20 ARRANGEMENTS FOR NOISE REDUCTION. ATE82083T1 (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
GB878717040A GB8717040D0 (en) 1987-07-20 1987-07-20 Noise reduction systems
GB878717043A GB8717043D0 (en) 1987-07-20 1987-07-20 Noise reduction systems
GB878717042A GB8717042D0 (en) 1987-07-20 1987-07-20 Noise reduction systems
PCT/GB1988/000581 WO1989000746A1 (en) 1987-07-20 1988-07-20 Improvements relating to noise reduction systems
EP88905991A EP0327617B1 (en) 1987-07-20 1988-07-20 Improvements relating to noise reduction systems

Publications (1)

Publication Number Publication Date
ATE82083T1 true ATE82083T1 (en) 1992-11-15

Family

ID=27263515

Family Applications (1)

Application Number Title Priority Date Filing Date
AT88905991T ATE82083T1 (en) 1987-07-20 1988-07-20 ARRANGEMENTS FOR NOISE REDUCTION.

Country Status (6)

Country Link
EP (1) EP0327617B1 (en)
AT (1) ATE82083T1 (en)
AU (1) AU608041B2 (en)
CA (1) CA1299725C (en)
DE (1) DE3875717T2 (en)
WO (1) WO1989000746A1 (en)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5091954A (en) * 1989-03-01 1992-02-25 Sony Corporation Noise reducing receiver device
US5276740A (en) * 1990-01-19 1994-01-04 Sony Corporation Earphone device
EP0464220B1 (en) * 1990-01-19 1995-09-27 Sony Corporation Earphone device
US5224168A (en) * 1991-05-08 1993-06-29 Sri International Method and apparatus for the active reduction of compression waves
WO1994017513A1 (en) * 1993-01-29 1994-08-04 Active Noise And Vibration Technologies, Inc. Earpiece for active noise cancelling headset
EP0967592B1 (en) * 1993-06-23 2007-01-24 Noise Cancellation Technologies, Inc. Variable gain active noise cancellation system with improved residual noise sensing
AT403417B (en) * 1995-04-25 1998-02-25 Fritz Dr Paschke SOUND FILTER DEVICE
US5675658A (en) * 1995-07-27 1997-10-07 Brittain; Thomas Paige Active noise reduction headset
JP2003532913A (en) * 2000-03-07 2003-11-05 スラブ ディー・エス・ピー リミテッド Active noise reduction system
US8077874B2 (en) 2006-04-24 2011-12-13 Bose Corporation Active noise reduction microphone placing
US8054992B2 (en) * 2006-04-24 2011-11-08 Bose Corporation High frequency compensating
DE102009005302B4 (en) 2009-01-16 2022-01-05 Sennheiser Electronic Gmbh & Co. Kg Protective helmet and device for active noise suppression
US8085946B2 (en) 2009-04-28 2011-12-27 Bose Corporation ANR analysis side-chain data support
US8345888B2 (en) 2009-04-28 2013-01-01 Bose Corporation Digital high frequency phase compensation
US8553900B2 (en) * 2010-05-14 2013-10-08 Creative Technology Ltd Noise reduction circuit with monitoring functionality
US11164554B2 (en) 2020-03-06 2021-11-02 Bose Corporation Wearable active noise reduction (ANR) device having low frequency feedback loop modulation

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4061875A (en) * 1977-02-22 1977-12-06 Stephen Freifeld Audio processor for use in high noise environments
WO1982004479A1 (en) * 1981-06-12 1982-12-23 Chaplin George Brian Barrie Method and apparatus for reducing repetitive noise entering the ear
ZA825676B (en) * 1981-08-11 1983-06-29 Sound Attenuators Ltd Method and apparatus for low frequency active attennuation
DE3133107A1 (en) * 1981-08-21 1983-03-10 Michael 5440 Mayen Hofmann Personal sound protection
GB2172769B (en) * 1985-03-21 1988-07-06 Topexpress Ltd Improvements in acoustic attenuation
GB8517716D0 (en) * 1985-07-13 1985-08-21 Plessey Co Plc Noise reduction arrangements

Also Published As

Publication number Publication date
AU608041B2 (en) 1991-03-21
EP0327617B1 (en) 1992-11-04
CA1299725C (en) 1992-04-28
EP0327617A1 (en) 1989-08-16
DE3875717D1 (en) 1992-12-10
DE3875717T2 (en) 1993-03-18
AU2071688A (en) 1989-02-13
WO1989000746A1 (en) 1989-01-26

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Legal Events

Date Code Title Description
EEFA Change of the company name
REN Ceased due to non-payment of the annual fee