EP0192379A3 - Improvements relating to noise reduction arrangements - Google Patents

Improvements relating to noise reduction arrangements Download PDF

Info

Publication number
EP0192379A3
EP0192379A3 EP86300791A EP86300791A EP0192379A3 EP 0192379 A3 EP0192379 A3 EP 0192379A3 EP 86300791 A EP86300791 A EP 86300791A EP 86300791 A EP86300791 A EP 86300791A EP 0192379 A3 EP0192379 A3 EP 0192379A3
Authority
EP
European Patent Office
Prior art keywords
noise reduction
noise
improvements relating
reduction arrangements
ear
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.)
Granted
Application number
EP86300791A
Other versions
EP0192379B1 (en
EP0192379A2 (en
Inventor
Robert Christopher Twiney
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.)
BAE Systems Defence Systems Ltd
Original Assignee
Plessey Overseas Ltd
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 Plessey Overseas Ltd filed Critical Plessey Overseas Ltd
Priority to AT86300791T priority Critical patent/ATE71761T1/en
Publication of EP0192379A2 publication Critical patent/EP0192379A2/en
Publication of EP0192379A3 publication Critical patent/EP0192379A3/en
Application granted granted Critical
Publication of EP0192379B1 publication Critical patent/EP0192379B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • G10K11/1787—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
    • G10K11/1781—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
    • G10K11/17857—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
    • 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
    • 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
    • G10K2210/3013—Analogue, i.e. using analogue computers or circuits
    • 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
    • G10K2210/3218—Filters other than the algorithm-related filters

Abstract

An active noise reduction arrangement which comprises at least one ear defender or earphone structure which embodies a small noise pick-up microphone and associated noise-cancelling transducer, in which a front cavity defined between the structure and the ear of its wearer when the arrangement is in use is coupled to a further cavity and/or source of low frequency noise-cancellation signals by means of low-pass acoustic filter means.
EP86300791A 1985-02-21 1986-02-06 Improvements relating to noise reduction arrangements Expired - Lifetime EP0192379B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86300791T ATE71761T1 (en) 1985-02-21 1986-02-06 NOISE REDUCTION ARRANGEMENTS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8504541 1985-02-21
GB858504541A GB8504541D0 (en) 1985-02-21 1985-02-21 Noise reduction arrangements

Publications (3)

Publication Number Publication Date
EP0192379A2 EP0192379A2 (en) 1986-08-27
EP0192379A3 true EP0192379A3 (en) 1987-06-03
EP0192379B1 EP0192379B1 (en) 1992-01-15

Family

ID=10574888

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86300791A Expired - Lifetime EP0192379B1 (en) 1985-02-21 1986-02-06 Improvements relating to noise reduction arrangements

Country Status (4)

Country Link
EP (1) EP0192379B1 (en)
AT (1) ATE71761T1 (en)
DE (1) DE3683380D1 (en)
GB (1) GB8504541D0 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8910815U1 (en) * 1989-09-11 1989-11-23 Kind, Werner, 3006 Burgwedel, De
US5852667A (en) * 1995-07-03 1998-12-22 Pan; Jianhua Digital feed-forward active noise control system
EP1074971B1 (en) * 1995-07-03 2003-04-09 National Research Council Of Canada Digital feed-forward active noise control system
GB2360165A (en) 2000-03-07 2001-09-12 Central Research Lab Ltd A method of improving the audibility of sound from a loudspeaker located close to an ear
EP2285135A1 (en) * 2009-07-07 2011-02-16 Nxp B.V. Microphone-speaker device comprising a low pass filter

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1903794A1 (en) * 1969-01-25 1970-08-13 Instr Systems Gmbh Headphone
DE2601661A1 (en) * 1976-01-17 1977-07-21 Battelle Institut E V Noise protection device for personal use - has microphone and amplification system to convert sound received near user's ears into skull vibrations
FR2398425A1 (en) * 1977-07-18 1979-02-16 Hehemann Guenter STEREOPHONIC HEADPHONES
DE2925134A1 (en) * 1979-06-22 1981-01-08 Sennheiser Electronic Ear protecting muffs - have microphone sound reproducer and amplifier to regulate sound reaching ear
DE3411494A1 (en) * 1984-03-28 1985-10-03 Axel 6000 Frankfurt Klopprogge Method for suppressing sound and a circuit arrangement and sound-protection device to carry out the method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1903794A1 (en) * 1969-01-25 1970-08-13 Instr Systems Gmbh Headphone
DE2601661A1 (en) * 1976-01-17 1977-07-21 Battelle Institut E V Noise protection device for personal use - has microphone and amplification system to convert sound received near user's ears into skull vibrations
FR2398425A1 (en) * 1977-07-18 1979-02-16 Hehemann Guenter STEREOPHONIC HEADPHONES
DE2925134A1 (en) * 1979-06-22 1981-01-08 Sennheiser Electronic Ear protecting muffs - have microphone sound reproducer and amplifier to regulate sound reaching ear
DE3411494A1 (en) * 1984-03-28 1985-10-03 Axel 6000 Frankfurt Klopprogge Method for suppressing sound and a circuit arrangement and sound-protection device to carry out the method

Also Published As

Publication number Publication date
EP0192379B1 (en) 1992-01-15
EP0192379A2 (en) 1986-08-27
GB8504541D0 (en) 1985-03-27
DE3683380D1 (en) 1992-02-27
ATE71761T1 (en) 1992-02-15

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