SE7705504L - Sett och anordning for aktiv dempning av repetitiva ljud - Google Patents

Sett och anordning for aktiv dempning av repetitiva ljud

Info

Publication number
SE7705504L
SE7705504L SE7705504A SE7705504A SE7705504L SE 7705504 L SE7705504 L SE 7705504L SE 7705504 A SE7705504 A SE 7705504A SE 7705504 A SE7705504 A SE 7705504A SE 7705504 L SE7705504 L SE 7705504L
Authority
SE
Sweden
Prior art keywords
noise
kit
source
repetitive sounds
active mute
Prior art date
Application number
SE7705504A
Other languages
English (en)
Other versions
SE447937B (sv
Inventor
G B B Chaplin
R A Smith
R G Bearcroft
Original Assignee
Sound Attenuators 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 Sound Attenuators Ltd filed Critical Sound Attenuators Ltd
Publication of SE7705504L publication Critical patent/SE7705504L/sv
Publication of SE447937B publication Critical patent/SE447937B/sv

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
    • G10K11/17879—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
    • 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
    • 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
    • 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
    • G10K2210/3033—Information contained in memory, e.g. stored signals or transfer functions
    • 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
    • G10K2210/3042—Parallel processing
    • 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
    • G10K2210/301—Computational
    • G10K2210/3057—Variation of parameters to test for optimisation
SE7705504A 1976-05-13 1977-05-11 Sett och anordning for aktiv dempning av repetitiva ljud SE447937B (sv)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB19717/76A GB1577322A (en) 1976-05-13 1976-05-13 Active attenuation of recurring vibrations

Publications (2)

Publication Number Publication Date
SE7705504L true SE7705504L (sv) 1977-11-14
SE447937B SE447937B (sv) 1986-12-22

Family

ID=10134053

Family Applications (1)

Application Number Title Priority Date Filing Date
SE7705504A SE447937B (sv) 1976-05-13 1977-05-11 Sett och anordning for aktiv dempning av repetitiva ljud

Country Status (9)

Country Link
US (1) US4153815A (sv)
AU (1) AU507688B2 (sv)
BE (1) BE854547A (sv)
DE (1) DE2721754C2 (sv)
FR (1) FR2351466A1 (sv)
GB (1) GB1577322A (sv)
NO (1) NO147851C (sv)
SE (1) SE447937B (sv)
ZA (1) ZA772659B (sv)

Families Citing this family (112)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4417098A (en) * 1979-08-16 1983-11-22 Sound Attenuators Limited Method of reducing the adaption time in the cancellation of repetitive vibration
AU542511B2 (en) * 1979-11-21 1985-02-21 Chaplin Patents Holding Co. Ltd Improved method and appartus for cancelling vibration
DE3025391A1 (de) * 1980-07-04 1982-01-28 Battelle-Institut E.V., 6000 Frankfurt Verfahren und vorrichtung zur unterdrueckung von akustischen schwingungen
US4329714A (en) * 1980-11-26 1982-05-11 Rca Corporation Audio distortion eliminator
US4473906A (en) * 1980-12-05 1984-09-25 Lord Corporation Active acoustic attenuator
DE3106029A1 (de) * 1981-02-19 1982-09-09 Volkswagenwerk Ag, 3180 Wolfsburg "verfahren und anordnung zur verringerung des geraeuschpegels im kopfbereich von kraftfahrzeuginsassen"
US4480333A (en) * 1981-04-15 1984-10-30 National Research Development Corporation Method and apparatus for active sound control
ZA824145B (en) * 1981-06-12 1983-04-27 Sound Attenuators Ltd Method and apparatus for reducing repetitive noise entering the ear
JPS5864895A (ja) * 1981-10-14 1983-04-18 Shigetaro Muraoka ハウリング防止方法
ZA828700B (en) * 1981-11-26 1983-09-28 Sound Attenuators Ltd Method of and apparatus for cancelling vibrations from a source of repetitive vibrations
DE3209617C2 (de) * 1982-03-17 1985-10-10 Deutsche Forschungs- und Versuchsanstalt für Luft- und Raumfahrt e.V., 5000 Köln Geräuscharme Turboarbeitsmaschine
JPH0646058B2 (ja) * 1982-04-19 1994-06-15 チャプリン パテンツ ホ−ルディング カンパニ− インコ−ポレ−テッド 振動源から支持構造物への振動伝達を減衰させるための装置
JPS599699A (ja) * 1982-07-07 1984-01-19 日産自動車株式会社 自動車の車室内音場制御装置
FR2531023B1 (fr) * 1982-08-02 1987-04-30 Peugeot Dispositif d'attenuation du bruit dans l'habitacle d'un vehicule automobile
GB2126837B (en) * 1982-08-19 1986-07-23 British Aerospace Noise suppression
US4562589A (en) * 1982-12-15 1985-12-31 Lord Corporation Active attenuation of noise in a closed structure
CA1234017A (en) * 1983-12-02 1988-03-15 George B.B. Chaplin Method and apparatus for reducing vibration
GB8404494D0 (en) * 1984-02-21 1984-03-28 Swinbanks M A Attenuation of sound waves
GB8405914D0 (en) * 1984-03-07 1984-04-11 Swinbanks M A Reducing noise by cancellation
US4589137A (en) * 1985-01-03 1986-05-13 The United States Of America As Represented By The Secretary Of The Navy Electronic noise-reducing system
US4689821A (en) * 1985-09-23 1987-08-25 Lockheed Corporation Active noise control system
US5170433A (en) * 1986-10-07 1992-12-08 Adaptive Control Limited Active vibration control
GB2203016A (en) * 1986-10-07 1988-10-05 Adaptive Control Ltd Active sound control apparatus
WO1988002912A1 (en) * 1986-10-07 1988-04-21 Adaptive Control Limited Active vibration control
US4710656A (en) * 1986-12-03 1987-12-01 Studer Philip A Spring neutralized magnetic vibration isolator
US4750523A (en) * 1987-10-30 1988-06-14 Beloit Corporation Active attenuator and method
US4947435A (en) * 1988-03-25 1990-08-07 Active Noise & Vibration Tech Method of transfer function generation and active noise cancellation in a vibrating system
US5046103A (en) * 1988-06-07 1991-09-03 Applied Acoustic Research, Inc. Noise reducing system for voice microphones
US4878188A (en) * 1988-08-30 1989-10-31 Noise Cancellation Tech Selective active cancellation system for repetitive phenomena
JPH02225966A (ja) * 1989-02-27 1990-09-07 Toshiba Corp 冷却装置の消音装置
JPH087002B2 (ja) * 1989-02-28 1996-01-29 株式会社東芝 冷却装置の消音装置
US4930113A (en) * 1989-03-30 1990-05-29 Halliburton Geophysical Services, Inc. Suppression of air-coupled noise produced by seismic vibrators
US5033082A (en) * 1989-07-31 1991-07-16 Nelson Industries, Inc. Communication system with active noise cancellation
US5117642A (en) * 1989-12-18 1992-06-02 Kabushiki Kaisha Toshiba Low noise refrigerator and noise control method thereof
US5127235A (en) * 1989-12-18 1992-07-07 Kabushiki Kaisha Toshiba Low noise refrigerator and noise control method thereof
GB8929358D0 (en) * 1989-12-30 1990-02-28 2020 Science Limited Active vibration reducing system
US4999534A (en) * 1990-01-19 1991-03-12 Contraves Goerz Corporation Active vibration reduction in apparatus with cross-coupling between control axes
US5063598A (en) * 1990-04-25 1991-11-05 Ford Motor Company Active noise control system with two stage conditioning
US5319165A (en) * 1990-04-25 1994-06-07 Ford Motor Company Dual bandpass secondary source
US5119902A (en) * 1990-04-25 1992-06-09 Ford Motor Company Active muffler transducer arrangement
US5229556A (en) * 1990-04-25 1993-07-20 Ford Motor Company Internal ported band pass enclosure for sound cancellation
US5323466A (en) * 1990-04-25 1994-06-21 Ford Motor Company Tandem transducer magnet structure
US5233137A (en) * 1990-04-25 1993-08-03 Ford Motor Company Protective anc loudspeaker membrane
US5060271A (en) * 1990-05-04 1991-10-22 Ford Motor Company Active muffler with dynamic tuning
US5386472A (en) * 1990-08-10 1995-01-31 General Motors Corporation Active noise control system
US5233540A (en) * 1990-08-30 1993-08-03 The Boeing Company Method and apparatus for actively reducing repetitive vibrations
US5146505A (en) * 1990-10-04 1992-09-08 General Motors Corporation Method for actively attenuating engine generated noise
US5245552A (en) * 1990-10-31 1993-09-14 The Boeing Company Method and apparatus for actively reducing multiple-source repetitive vibrations
US5255321A (en) * 1990-12-05 1993-10-19 Harman International Industries, Inc. Acoustic transducer for automotive noise cancellation
KR930007959B1 (ko) * 1990-12-19 1993-08-25 주식회사 금성사 에어컨디셔너의 소음 저감장치 및 방법
JPH05249983A (ja) * 1991-05-15 1993-09-28 Ricoh Co Ltd 画像形成装置
US5404409A (en) * 1991-07-31 1995-04-04 Fujitsu Ten Limited Adaptive filtering means for an automatic sound controlling apparatus
DE4140880C1 (en) * 1991-12-09 1993-04-29 Carl Schenck Ag, 6100 Darmstadt, De Reducing infra-sound emission from vibrating machines, e.g. oscillating conveyor or sieve - grouping machines according to same rated frequency and driving at sync. frequency and with phase shifts to bring infra-sound level to min.
US5219037A (en) * 1992-01-21 1993-06-15 General Motors Corporation Component mount assembly providing active control of vehicle vibration
JP2876874B2 (ja) * 1992-03-04 1999-03-31 日産自動車株式会社 車両用能動型騒音制御装置
US5210805A (en) * 1992-04-06 1993-05-11 Ford Motor Company Transducer flux optimization
KR100189961B1 (ko) * 1992-04-09 1999-06-01 윤종용 잡음 제거 장치
CA2117803A1 (en) * 1992-04-10 1993-10-28 Jaime I. Chait Active cancellation of noise or vibrations
US5336856A (en) * 1992-07-07 1994-08-09 Arvin Industries, Inc. Electronic muffler assembly with exhaust bypass
US5311453A (en) * 1992-09-11 1994-05-10 Noise Cancellation Technologies, Inc. Variable point sampling
JPH06167988A (ja) * 1992-09-29 1994-06-14 Mazda Motor Corp 車両の振動低減装置
KR0130635B1 (ko) * 1992-10-14 1998-04-09 모리시타 요이찌 연소 장치의 적응 소음 시스템
GB2271909B (en) * 1992-10-21 1996-05-22 Lotus Car Adaptive control system
US5732143A (en) * 1992-10-29 1998-03-24 Andrea Electronics Corp. Noise cancellation apparatus
JPH06149268A (ja) * 1992-11-02 1994-05-27 Fuji Heavy Ind Ltd 車室内騒音低減装置
US5844996A (en) * 1993-02-04 1998-12-01 Sleep Solutions, Inc. Active electronic noise suppression system and method for reducing snoring noise
US5361303A (en) * 1993-04-01 1994-11-01 Noise Cancellation Technologies, Inc. Frequency domain adaptive control system
US5481615A (en) * 1993-04-01 1996-01-02 Noise Cancellation Technologies, Inc. Audio reproduction system
US5416845A (en) * 1993-04-27 1995-05-16 Noise Cancellation Technologies, Inc. Single and multiple channel block adaptive methods and apparatus for active sound and vibration control
US5526432A (en) * 1993-05-21 1996-06-11 Noise Cancellation Technologies, Inc. Ducted axial fan
CA2125220C (en) * 1993-06-08 2000-08-15 Joji Kane Noise suppressing apparatus capable of preventing deterioration in high frequency signal characteristic after noise suppression and in balanced signal transmitting system
US5539831A (en) * 1993-08-16 1996-07-23 The University Of Mississippi Active noise control stethoscope
US5418857A (en) * 1993-09-28 1995-05-23 Noise Cancellation Technologies, Inc. Active control system for noise shaping
US5473698A (en) * 1993-11-23 1995-12-05 Garnjost; Kenneth D. Method of controlling the application of counter-vibration to a structure
US5502770A (en) * 1993-11-29 1996-03-26 Caterpillar Inc. Indirectly sensed signal processing in active periodic acoustic noise cancellation
WO1995024309A2 (en) * 1994-03-02 1995-09-14 Noise Cancellation Technologies, Inc. Non invasive error sensing dve method and apparatus
US5660255A (en) * 1994-04-04 1997-08-26 Applied Power, Inc. Stiff actuator active vibration isolation system
US5619581A (en) * 1994-05-18 1997-04-08 Lord Corporation Active noise and vibration cancellation system
US5487027A (en) * 1994-05-18 1996-01-23 Lord Corporation Process and apparatus for providing an analog waveform synchronized with an input signal
DE4420439A1 (de) * 1994-06-10 1995-12-14 Stankiewicz Gmbh Ladeflächenauskleidung mit integrierter Schallisolation
US5627896A (en) * 1994-06-18 1997-05-06 Lord Corporation Active control of noise and vibration
US5418858A (en) * 1994-07-11 1995-05-23 Cooper Tire & Rubber Company Method and apparatus for intelligent active and semi-active vibration control
US5745580A (en) * 1994-11-04 1998-04-28 Lord Corporation Reduction of computational burden of adaptively updating control filter(s) in active systems
US5692056A (en) * 1994-12-07 1997-11-25 Gardner; William A. Method and apparatus for intracranial noise suppression
US5570426A (en) * 1994-12-07 1996-10-29 Gardner; William A. Method and apparatus for intracranial noise suppression
DE19531402C2 (de) * 1995-08-26 1999-04-01 Mannesmann Sachs Ag Vorrichtung und Verfahren zum Beeinflussen von Schwingungen in einem Fahrgastraum eines Kraftfahrzeugs und Vorrichtung und Verfahren zum Erkennen von Defekten an einem Kraftfahrzeug
US6343127B1 (en) 1995-09-25 2002-01-29 Lord Corporation Active noise control system for closed spaces such as aircraft cabin
US5615868A (en) * 1995-10-04 1997-04-01 Bolt Beranek And Newman Inc. Active pneumatic mount
US6072881A (en) * 1996-07-08 2000-06-06 Chiefs Voice Incorporated Microphone noise rejection system
US6002778A (en) * 1996-08-07 1999-12-14 Lord Corporation Active structural control system and method including active vibration absorbers (AVAS)
US6192133B1 (en) * 1996-09-17 2001-02-20 Kabushiki Kaisha Toshiba Active noise control apparatus
US5845236A (en) * 1996-10-16 1998-12-01 Lord Corporation Hybrid active-passive noise and vibration control system for aircraft
US5848168A (en) * 1996-11-04 1998-12-08 Tenneco Automotive Inc. Active noise conditioning system
JPH10184747A (ja) * 1996-12-19 1998-07-14 Sumitomo Electric Ind Ltd 車両ブレーキ用制振装置
US5987385A (en) * 1997-08-29 1999-11-16 Dresser Industries, Inc. Method and apparatus for creating an image of an earth borehole or a well casing
US5886303A (en) * 1997-10-20 1999-03-23 Dresser Industries, Inc. Method and apparatus for cancellation of unwanted signals in MWD acoustic tools
US6363345B1 (en) 1999-02-18 2002-03-26 Andrea Electronics Corporation System, method and apparatus for cancelling noise
US6608904B1 (en) 1999-06-04 2003-08-19 Telefonaktiebolaget Lm Ericsson (Publ) Method and apparatus for canceling interference in a loudspeaker communication path through adaptive discrimination
US6594367B1 (en) 1999-10-25 2003-07-15 Andrea Electronics Corporation Super directional beamforming design and implementation
EP1247428B1 (en) * 1999-12-09 2003-08-27 Frederick Johannes Bruwer Speech distribution system
WO2001097050A1 (en) * 2000-06-14 2001-12-20 Sleep Solutions, Inc. Secure medical test and result delivery system
US6320968B1 (en) 2000-06-28 2001-11-20 Esion-Tech, Llc Adaptive noise rejection system and method
US7248703B1 (en) 2001-06-26 2007-07-24 Bbn Technologies Corp. Systems and methods for adaptive noise cancellation
US6859420B1 (en) 2001-06-26 2005-02-22 Bbnt Solutions Llc Systems and methods for adaptive wind noise rejection
US20030016833A1 (en) * 2001-07-19 2003-01-23 Siemens Vdo Automotive, Inc. Active noise cancellation system utilizing a signal delay to accommodate noise phase change
US7274621B1 (en) 2002-06-13 2007-09-25 Bbn Technologies Corp. Systems and methods for flow measurement
US8302456B2 (en) 2006-02-23 2012-11-06 Asylum Research Corporation Active damping of high speed scanning probe microscope components
US7854596B2 (en) * 2007-01-24 2010-12-21 Johnson Controls Technology Company System and method of operation of multiple screw compressors with continuously variable speed to provide noise cancellation
US20080187147A1 (en) * 2007-02-05 2008-08-07 Berner Miranda S Noise reduction systems and methods
US9761217B2 (en) * 2013-06-28 2017-09-12 Rakuten Kobo, Inc. Reducing ambient noise distraction with an electronic personal display
US9383388B2 (en) 2014-04-21 2016-07-05 Oxford Instruments Asylum Research, Inc Automated atomic force microscope and the operation thereof
US20200227021A1 (en) * 2019-01-11 2020-07-16 Haier Us Appliance Solutions, Inc. Consumer appliances having one or more noise cancellation features

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2983790A (en) * 1953-04-30 1961-05-09 Rca Corp Electronic sound absorber
US2776020A (en) * 1955-02-09 1957-01-01 Gen Electric Noise reducing system for transformers
US3071752A (en) * 1958-01-02 1963-01-01 Strasberg Murray Interference reduction apparatus
US3936606A (en) * 1971-12-07 1976-02-03 Wanke Ronald L Acoustic abatement method and apparatus
US4044203A (en) * 1972-11-24 1977-08-23 National Research Development Corporation Active control of sound waves
DE2507428A1 (de) * 1974-02-22 1975-08-28 Lawson Tancred Henry Verfahren und vorrichtung zur unterdrueckung oder abschwaechung der schallfortpflanzung
US4025724A (en) * 1975-08-12 1977-05-24 Westinghouse Electric Corporation Noise cancellation apparatus
FR2386881A1 (fr) * 1977-04-05 1978-11-03 Sound Attenuators Ltd Perfectionnements relatifs a l'attenuation active de sons

Also Published As

Publication number Publication date
FR2351466B1 (sv) 1984-07-20
SE447937B (sv) 1986-12-22
ZA772659B (en) 1978-04-26
NO771655L (no) 1977-11-15
US4153815A (en) 1979-05-08
FR2351466A1 (fr) 1977-12-09
DE2721754C2 (de) 1986-06-05
BE854547A (fr) 1977-09-01
DE2721754A1 (de) 1977-11-24
NO147851C (no) 1983-06-22
AU2483877A (en) 1978-11-09
GB1577322A (en) 1980-10-22
AU507688B2 (en) 1980-02-21
NO147851B (no) 1983-03-14

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