FR2321163B1 - - Google Patents

Info

Publication number
FR2321163B1
FR2321163B1 FR7622756A FR7622756A FR2321163B1 FR 2321163 B1 FR2321163 B1 FR 2321163B1 FR 7622756 A FR7622756 A FR 7622756A FR 7622756 A FR7622756 A FR 7622756A FR 2321163 B1 FR2321163 B1 FR 2321163B1
Authority
FR
France
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
Application number
FR7622756A
Other versions
FR2321163A1 (fr
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.)
CBS Corp
Original Assignee
Westinghouse Electric Corp
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 Westinghouse Electric Corp filed Critical Westinghouse Electric Corp
Publication of FR2321163A1 publication Critical patent/FR2321163A1/fr
Application granted granted Critical
Publication of FR2321163B1 publication Critical patent/FR2321163B1/fr
Granted 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
    • G10K11/1781—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
    • G10K11/17813—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 acoustic paths, e.g. estimating, calibrating or testing of transfer functions or cross-terms
    • G10K11/17819—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 acoustic paths, e.g. estimating, calibrating or testing of transfer functions or cross-terms between the output signals and the reference signals, e.g. to prevent howling
    • 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
    • G10K11/1785—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
    • G10K2210/102—Two 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
    • G10K2210/30—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
    • G10K2210/3042—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
    • G10K2210/321—Physical
    • G10K2210/3216—Cancellation means disposed in the vicinity of the source
    • 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
    • G10K2210/3222—Manual tuning
    • 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
    • G10K2210/50—Miscellaneous
    • G10K2210/501—Acceleration, e.g. for accelerometers

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
  • Circuit For Audible Band Transducer (AREA)
FR7622756A 1975-08-12 1976-07-26 Dispositif de suppression de bruit Granted FR2321163A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US05/603,978 US4025724A (en) 1975-08-12 1975-08-12 Noise cancellation apparatus

Publications (2)

Publication Number Publication Date
FR2321163A1 FR2321163A1 (fr) 1977-03-11
FR2321163B1 true FR2321163B1 (fr) 1981-01-23

Family

ID=24417676

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7622756A Granted FR2321163A1 (fr) 1975-08-12 1976-07-26 Dispositif de suppression de bruit

Country Status (13)

Country Link
US (1) US4025724A (fr)
JP (1) JPS5926039B2 (fr)
AU (1) AU507740B2 (fr)
BE (1) BE844682A (fr)
CA (1) CA1088871A (fr)
CH (1) CH610429A5 (fr)
DE (1) DE2635453A1 (fr)
ES (1) ES450603A1 (fr)
FR (1) FR2321163A1 (fr)
GB (1) GB1541121A (fr)
IT (1) IT1069185B (fr)
NL (1) NL7608417A (fr)
SE (1) SE7608834L (fr)

Families Citing this family (105)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1577322A (en) * 1976-05-13 1980-10-22 Bearcroft R Active attenuation of recurring vibrations
FR2386881A1 (fr) * 1977-04-05 1978-11-03 Sound Attenuators Ltd Perfectionnements relatifs a l'attenuation active de sons
US4423289A (en) * 1979-06-28 1983-12-27 National Research Development Corporation Signal processing systems
US4473906A (en) * 1980-12-05 1984-09-25 Lord Corporation Active acoustic attenuator
US4480333A (en) * 1981-04-15 1984-10-30 National Research Development Corporation Method and apparatus for active sound control
US4388711A (en) * 1981-07-28 1983-06-14 The United States Of America As Represented By The Secretary Of The Navy Optimum flow noise cancelling hydrophone module
JPS5827313A (ja) * 1981-08-11 1983-02-18 Hitachi Ltd 静止誘導電器の振動低減方法
JPS5895806A (ja) * 1981-12-02 1983-06-07 Hitachi Ltd 静止誘導電器の防音装置
GB2122052B (en) * 1982-06-09 1986-01-29 Plessey Co Plc Reducing noise or vibration
JPS59133595A (ja) * 1982-11-26 1984-07-31 ロ−ド・コ−ポレ−シヨン 能動音響減衰装置
US4562589A (en) * 1982-12-15 1985-12-31 Lord Corporation Active attenuation of noise in a closed structure
US4590593A (en) * 1983-06-30 1986-05-20 Nl Industries, Inc. Electronic noise filtering system
EP0159314A4 (fr) * 1983-09-26 1986-07-23 Exploration Logging Inc Filtre d'amortissement du bruit.
DE3411494A1 (de) * 1984-03-28 1985-10-03 Axel 6000 Frankfurt Klopprogge Verfahren zur unterdrueckung von schall sowie schaltungsanordnung und schallschutzvorrichtung zur durchfuehrung des verfahrens
GB8418056D0 (en) * 1984-07-16 1984-08-22 Roberts J P Active control of acoustic instability in combustion chambers
US4630304A (en) * 1985-07-01 1986-12-16 Motorola, Inc. Automatic background noise estimator for a noise suppression system
US4628529A (en) * 1985-07-01 1986-12-09 Motorola, Inc. Noise suppression system
GB8520086D0 (en) * 1985-08-09 2011-06-29 Secr Defence A monitoring system for a ship's radiated noise
US4677677A (en) * 1985-09-19 1987-06-30 Nelson Industries Inc. Active sound attenuation system with on-line adaptive feedback cancellation
US4665549A (en) * 1985-12-18 1987-05-12 Nelson Industries Inc. Hybrid active silencer
US4829590A (en) * 1986-01-13 1989-05-09 Technology Research International, Inc. Adaptive noise abatement system
US4677676A (en) * 1986-02-11 1987-06-30 Nelson Industries, Inc. Active attenuation system with on-line modeling of speaker, error path and feedback pack
US4715559A (en) * 1986-05-15 1987-12-29 Fuller Christopher R Apparatus and method for global noise reduction
GB8615315D0 (en) * 1986-06-23 1986-07-30 Secr Defence Aircraft cabin noise control apparatus
US4736431A (en) * 1986-10-23 1988-04-05 Nelson Industries, Inc. Active attenuation system with increased dynamic range
FR2609827B1 (fr) * 1987-01-16 1991-04-12 Electricite De France Procede et dispositif pour reduire le bruit a composante harmonique dominante rayonne par une paroi d'appareillage
US4805733A (en) * 1987-07-07 1989-02-21 Nippondenso Co., Ltd. Active silencer
US5012274A (en) * 1987-12-31 1991-04-30 Eugene Dolgoff Active matrix LCD image projection system
US5300942A (en) * 1987-12-31 1994-04-05 Projectavision Incorporated High efficiency light valve projection system with decreased perception of spaces between pixels and/or hines
US4930113A (en) * 1989-03-30 1990-05-29 Halliburton Geophysical Services, Inc. Suppression of air-coupled noise produced by seismic vibrators
US4928264A (en) * 1989-06-30 1990-05-22 The United States Of America As Represented By The Secretary Of The Navy Noise-suppressing hydrophones
US4963804A (en) * 1989-07-10 1990-10-16 Westinghouse Electric Corp. Apparatus and method for reducing vibration of rotating machinery
US5001763A (en) * 1989-08-10 1991-03-19 Mnc Inc. Electroacoustic device for hearing needs including noise cancellation
US5127235A (en) * 1989-12-18 1992-07-07 Kabushiki Kaisha Toshiba Low noise refrigerator and noise control method thereof
US5117642A (en) * 1989-12-18 1992-06-02 Kabushiki Kaisha Toshiba Low noise refrigerator and noise control method thereof
JP2748626B2 (ja) * 1989-12-29 1998-05-13 日産自動車株式会社 能動型騒音制御装置
JPH0684860B2 (ja) * 1990-05-01 1994-10-26 株式会社東芝 低騒音冷蔵庫
US5140640A (en) * 1990-08-14 1992-08-18 The Board Of Trustees Of The University Of Illinois Noise cancellation system
US5243512A (en) * 1991-05-20 1993-09-07 Westinghouse Electric Corp. Method and apparatus for minimizing vibration
US5452265A (en) * 1991-07-01 1995-09-19 The United States Of America As Represented By The Secretary Of The Navy Active acoustic impedance modification arrangement for controlling sound interaction
US5221185A (en) * 1991-08-05 1993-06-22 General Electric Company Method and apparatus for synchronizing rotating machinery to reduce noise
DE4133407C2 (de) * 1991-10-09 1994-01-20 Deutsche Aerospace Anordnung zur Kompensation des durch eine schwingende Wand abgestrahlten Schalles
US5315661A (en) * 1992-08-12 1994-05-24 Noise Cancellation Technologies, Inc. Active high transmission loss panel
GB9218465D0 (en) * 1992-08-29 1992-10-14 Adaptive Control Ltd Active sound control systems and sound reproduction systems
US5381485A (en) * 1992-08-29 1995-01-10 Adaptive Control Limited Active sound control systems and sound reproduction systems
US5692053A (en) * 1992-10-08 1997-11-25 Noise Cancellation Technologies, Inc. Active acoustic transmission loss box
CA2145862C (fr) * 1992-10-08 1999-03-09 Christopher R. Fuller Boite d'attenuation acoustique active
JP3410129B2 (ja) * 1992-12-25 2003-05-26 富士重工業株式会社 車室内騒音低減装置
GB2274757A (en) * 1993-01-28 1994-08-03 Secr Defence Ear defenders employing active noise control
EP0746843B1 (fr) * 1993-09-09 2001-11-14 NCT Group, Inc. Systeme global de reduction de bruit pour dispositif fixe a induction
US5410607A (en) * 1993-09-24 1995-04-25 Sri International Method and apparatus for reducing noise radiated from a complex vibrating surface
US5381381A (en) * 1993-09-30 1995-01-10 The United States Of America As Represented By The Secretary Of The Navy Far field acoustic radiation reduction
US5488666A (en) * 1993-10-01 1996-01-30 Greenhalgh Technologies System for suppressing sound from a flame
US5420383A (en) * 1993-10-22 1995-05-30 United Technologies Corporation Anti-sound arrangement for multi-stage blade cascade
US5524058A (en) * 1994-01-12 1996-06-04 Mnc, Inc. Apparatus for performing noise cancellation in telephonic devices and headwear
US5551650A (en) * 1994-06-16 1996-09-03 Lord Corporation Active mounts for aircraft engines
JP3390952B2 (ja) * 1995-06-26 2003-03-31 ネクストロム・ホールデイング・ソシエテ・アノニム 押し出し機及び方法、チューブラ製品、並びに管
US5812684A (en) * 1995-07-05 1998-09-22 Ford Global Technologies, Inc. Passenger compartment noise attenuation apparatus for use in a motor vehicle
WO1997002560A1 (fr) * 1995-07-05 1997-01-23 Alumax Inc. Procede et dispositif de lutte active contre les bruits de modes d'ordres eleves survenant dans des conduites
US5662136A (en) * 1995-09-11 1997-09-02 Defense Research Technologies, Inc. Acousto-fluidic driver for active control of turbofan engine noise
FR2739214B1 (fr) * 1995-09-27 1997-12-19 Technofirst Procede et dispositif d'attenuation active hybride de vibrations, notamment de vibrations mecaniques, sonores ou analogues
US7088832B1 (en) * 1996-03-14 2006-08-08 Cooper J Carl IFB system apparatus and method
US5887071A (en) * 1996-08-07 1999-03-23 Harman International Industries, Incorporated Dipole speaker headrests
US7853024B2 (en) * 1997-08-14 2010-12-14 Silentium Ltd. Active noise control system and method
IL121555A (en) * 1997-08-14 2008-07-08 Silentium Ltd Active acoustic noise reduction system
DE19743376A1 (de) 1997-09-30 1999-04-22 Siemens Ag Schallwellentherapieeinrichtung
EP0999540A1 (fr) * 1998-11-03 2000-05-10 Nederlandse Organisatie Voor Toegepast-Natuurwetenschappelijk Onderzoek Tno Panneau d'atténuation du son et méthode de calibration de ce panneau
US6478110B1 (en) 2000-03-13 2002-11-12 Graham P. Eatwell Vibration excited sound absorber
US6341101B1 (en) * 2000-03-27 2002-01-22 The United States Of America As Represented By The Secretary Of The Navy Launchable countermeasure device and method
US7162040B2 (en) * 2000-03-30 2007-01-09 Siemens Vdo Automotive, Inc. Mounting assembly for active noise attenuation system
US6865466B2 (en) * 2000-04-27 2005-03-08 American Axle & Manufacturing, Inc. Active vibration cancellation of gear mesh vibration
US7643015B2 (en) * 2002-05-24 2010-01-05 Massachusetts Institute Of Technology Systems and methods for tracking impacts
US7466832B2 (en) * 2002-07-31 2008-12-16 Harman International Industries, Incorporated Seatback audio controller
US6991289B2 (en) * 2002-07-31 2006-01-31 Harman International Industries, Incorporated Seatback audio system
US8855329B2 (en) * 2007-01-22 2014-10-07 Silentium Ltd. Quiet fan incorporating active noise control (ANC)
US20080187147A1 (en) * 2007-02-05 2008-08-07 Berner Miranda S Noise reduction systems and methods
US8229598B2 (en) * 2007-09-06 2012-07-24 Okuma Corporation Vibration suppressing device for machine tool
US8014903B2 (en) * 2007-10-25 2011-09-06 Okuma Corporation Method for suppressing vibration and device therefor
US9392360B2 (en) 2007-12-11 2016-07-12 Andrea Electronics Corporation Steerable sensor array system with video input
WO2009076523A1 (fr) * 2007-12-11 2009-06-18 Andrea Electronics Corporation Filtration adaptative dans un système à réseau de détecteurs
US8077489B2 (en) * 2008-05-15 2011-12-13 Lockheed Martin Corporation System and method of cancelling noise radiated from a switch-mode power converter
US8005574B2 (en) * 2008-07-08 2011-08-23 Okuma Corporation Vibration suppressing method and device
JP5234772B2 (ja) * 2008-10-28 2013-07-10 オークマ株式会社 工作機械の振動抑制方法及び装置
DE102008061552A1 (de) * 2008-12-11 2010-07-01 Areva Energietechnik Gmbh Verfahren und Vorrichtung zur Geräuschminderung für einen elektrischen Transformator
US9838784B2 (en) 2009-12-02 2017-12-05 Knowles Electronics, Llc Directional audio capture
US8615392B1 (en) * 2009-12-02 2013-12-24 Audience, Inc. Systems and methods for producing an acoustic field having a target spatial pattern
US8798290B1 (en) 2010-04-21 2014-08-05 Audience, Inc. Systems and methods for adaptive signal equalization
US9558755B1 (en) 2010-05-20 2017-01-31 Knowles Electronics, Llc Noise suppression assisted automatic speech recognition
US9928824B2 (en) 2011-05-11 2018-03-27 Silentium Ltd. Apparatus, system and method of controlling noise within a noise-controlled volume
US9431001B2 (en) 2011-05-11 2016-08-30 Silentium Ltd. Device, system and method of noise control
US8933576B2 (en) 2012-05-02 2015-01-13 United Technologies Corporation Hybrid friction wheel gearbox drivetrain for wind turbine applications
US9091250B2 (en) 2012-05-02 2015-07-28 United Technologies Corporation Ultra high efficiency low friction drive chain for wind turbine applications
US8598725B1 (en) 2012-06-11 2013-12-03 United Technologies Corporation Utilizing flux controllable PM electric machines for wind turbine applications
US9264524B2 (en) 2012-08-03 2016-02-16 The Penn State Research Foundation Microphone array transducer for acoustic musical instrument
US8884150B2 (en) * 2012-08-03 2014-11-11 The Penn State Research Foundation Microphone array transducer for acoustical musical instrument
US10014959B2 (en) 2013-11-15 2018-07-03 Msi Dfat Llc Standing wave reduction in direct field acoustic testing
US9525944B2 (en) * 2014-08-05 2016-12-20 The Boeing Company Apparatus and method for an active and programmable acoustic metamaterial
CN107112025A (zh) 2014-09-12 2017-08-29 美商楼氏电子有限公司 用于恢复语音分量的系统和方法
DE112016000545B4 (de) 2015-01-30 2019-08-22 Knowles Electronics, Llc Kontextabhängiges schalten von mikrofonen
DE102016007391A1 (de) 2016-06-17 2017-12-21 Oaswiss AG (i. G.) Antischallanordnung
DE102019218889A1 (de) 2019-12-04 2021-06-10 Lear Corporation Tonsystem
CN112233638B (zh) * 2020-10-14 2024-04-02 南京南大电子智慧型服务机器人研究院有限公司 一种可调的低频消声结构的设计方法
DE202021001457U1 (de) 2021-04-20 2021-06-16 Frank Sekura Schalldämmendes Element für Fensterlaibungen
EP4184504A1 (fr) * 2021-11-18 2023-05-24 BAE SYSTEMS plc Système et procédé pour contrôle acoustique actif
EP4434027A1 (fr) * 2021-11-18 2024-09-25 BAE SYSTEMS plc Système et procédé de commande acoustique active

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2743314A (en) * 1950-09-06 1956-04-24 Le Teleampliphone Soc Two-way loudspeaker telephone installations
US2776020A (en) * 1955-02-09 1957-01-01 Gen Electric Noise reducing system for transformers
FR1154170A (fr) * 1955-06-24 1958-04-03 Siemens Ag Dispositif pour réduire l'émission de sons ou bruits parasites provenant de corps soumis à des vibrations
US2964272A (en) * 1955-07-01 1960-12-13 Rca Corp Vibration control apparatus
DE1098730B (de) * 1957-07-01 1961-02-02 Licentia Gmbh Einrichtung zur Daemmung des von Gehaeusen abgestrahlten Geraeusches
US3071752A (en) * 1958-01-02 1963-01-01 Strasberg Murray Interference reduction apparatus
DE2139941A1 (de) * 1971-08-10 1973-03-01 Messerschmitt Boelkow Blohm Laermabschirmung durch schallgitter
GB1458663A (en) * 1972-12-15 1976-12-15 Ard Anstalt Microphone circuits

Also Published As

Publication number Publication date
FR2321163A1 (fr) 1977-03-11
JPS5926039B2 (ja) 1984-06-23
ES450603A1 (es) 1977-12-16
GB1541121A (en) 1979-02-21
SE7608834L (sv) 1977-02-13
US4025724A (en) 1977-05-24
NL7608417A (nl) 1977-02-15
BE844682A (fr) 1977-01-31
AU1639176A (en) 1978-02-02
JPS5223302A (en) 1977-02-22
IT1069185B (it) 1985-03-25
CH610429A5 (fr) 1979-04-12
CA1088871A (fr) 1980-11-04
AU507740B2 (en) 1980-02-28
DE2635453A1 (de) 1977-03-03

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