CA2204880A1 - Noise cancellation apparatus - Google Patents

Noise cancellation apparatus

Info

Publication number
CA2204880A1
CA2204880A1 CA002204880A CA2204880A CA2204880A1 CA 2204880 A1 CA2204880 A1 CA 2204880A1 CA 002204880 A CA002204880 A CA 002204880A CA 2204880 A CA2204880 A CA 2204880A CA 2204880 A1 CA2204880 A1 CA 2204880A1
Authority
CA
Canada
Prior art keywords
microphone
background noise
speech
noise cancellation
cancellation apparatus
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
CA002204880A
Other languages
French (fr)
Other versions
CA2204880C (en
Inventor
Douglas Andrea
Martin Topf
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.)
Andrea Electronics Corp
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of CA2204880A1 publication Critical patent/CA2204880A1/en
Application granted granted Critical
Publication of CA2204880C publication Critical patent/CA2204880C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers
    • H04M1/6008—Substation equipment, e.g. for use by subscribers including speech amplifiers in the transmitter circuit
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/04—Supports for telephone transmitters or receivers
    • H04M1/05—Supports for telephone transmitters or receivers specially adapted for use on head, throat or breast
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/19—Arrangements of transmitters, receivers, or complete sets to prevent eavesdropping, to attenuate local noise or to prevent undesired transmission; Mouthpieces or receivers specially adapted therefor
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
    • H04R1/1083—Reduction of ambient noise
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H04R3/02—Circuits for transducers, loudspeakers or microphones for preventing acoustic reaction, i.e. acoustic oscillatory feedback
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
    • H04B1/12—Neutralising, balancing, or compensation arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
    • H04R2201/10—Details of earpieces, attachments therefor, earphones or monophonic headphones covered by H04R1/10 but not provided for in any of its subgroups
    • H04R2201/107—Monophonic and stereophonic headphones with microphone for two-way hands free communication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
    • H04R2201/40—Details of arrangements for obtaining desired directional characteristic by combining a number of identical transducers covered by H04R1/40 but not provided for in any of its subgroups
    • H04R2201/403—Linear arrays of transducers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R29/00—Monitoring arrangements; Testing arrangements
    • H04R29/004—Monitoring arrangements; Testing arrangements for microphones
    • H04R29/005—Microphone arrays
    • H04R29/006—Microphone matching
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H04R3/005—Circuits for transducers, loudspeakers or microphones for combining the signals of two or more microphones

Abstract

Apparatus for reducing acoustic background noise for use with a telephone handset (10) or a boom microphone device (100) or a boom headset (401) or the like. The apparatus includes first (12) and second (14) microphones which are arranged such that the first microphone (12) receives a desired speech input and the background noise present in the vicinity of the speech, and the second microphone (14) receives substantially only the background noise. The background noise from the second microphone (14) is converted into a corresponding electrical signal and substracted (16) from a signal corresponding to the speech and background noise obtained from the first microphone (12) so as to produce a signal representing substantially the speech.
CA002204880A 1994-11-14 1995-11-14 Noise cancellation apparatus Expired - Fee Related CA2204880C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US08/339,126 US5673325A (en) 1992-10-29 1994-11-14 Noise cancellation apparatus
US08/339,126 1994-11-14
PCT/US1995/014756 WO1996015541A1 (en) 1994-11-14 1995-11-14 Noise cancellation apparatus

Publications (2)

Publication Number Publication Date
CA2204880A1 true CA2204880A1 (en) 1996-05-23
CA2204880C CA2204880C (en) 2001-05-29

Family

ID=23327614

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002204880A Expired - Fee Related CA2204880C (en) 1994-11-14 1995-11-14 Noise cancellation apparatus

Country Status (10)

Country Link
US (1) US5673325A (en)
EP (1) EP0792568A4 (en)
JP (1) JPH10509849A (en)
KR (1) KR970707665A (en)
CN (1) CN1172422A (en)
AU (1) AU4235996A (en)
BR (1) BR9509782A (en)
CA (1) CA2204880C (en)
FI (1) FI972048A (en)
WO (1) WO1996015541A1 (en)

Families Citing this family (77)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5732143A (en) * 1992-10-29 1998-03-24 Andrea Electronics Corp. Noise cancellation apparatus
US5715321A (en) * 1992-10-29 1998-02-03 Andrea Electronics Coporation Noise cancellation headset for use with stand or worn on ear
JPH09326844A (en) * 1996-06-03 1997-12-16 Mitsubishi Electric Corp Noise reduction speech device and noise reduction speech method
US5825898A (en) * 1996-06-27 1998-10-20 Lamar Signal Processing Ltd. System and method for adaptive interference cancelling
US5838804A (en) * 1996-08-07 1998-11-17 Transcrypt International, Inc. Apparatus and method for providing proper microphone DC bias current and load resistance for a telephone
DE69735300T2 (en) * 1996-08-15 2006-11-02 Cabot Safety Intermediate Corp., Southbridge DEVICE WITH ROTATABLE TILES
US6859525B1 (en) * 1996-10-23 2005-02-22 Riparius Ventures, Llc Internet telephony device
US6438240B1 (en) 1997-02-18 2002-08-20 Mitel Corporation Circuit to improve transducer separation in handsfree telephone
US6178248B1 (en) 1997-04-14 2001-01-23 Andrea Electronics Corporation Dual-processing interference cancelling system and method
US6266410B1 (en) * 1997-06-27 2001-07-24 Kabushiki Kaisha Toshiba Speakerphone and microphone case for the same
US6278377B1 (en) 1999-08-25 2001-08-21 Donnelly Corporation Indicator for vehicle accessory
US6420975B1 (en) 1999-08-25 2002-07-16 Donnelly Corporation Interior rearview mirror sound processing system
US6041130A (en) * 1998-06-23 2000-03-21 Mci Communications Corporation Headset with multiple connections
JP2000115881A (en) 1998-10-05 2000-04-21 Matsushita Electric Ind Co Ltd Sound collector
US6744883B1 (en) 1999-01-12 2004-06-01 Paradyne Corporation Filter system and method to suppress interference imposed upon a frequency-division multiplexed channel
US6363345B1 (en) 1999-02-18 2002-03-26 Andrea Electronics Corporation System, method and apparatus for cancelling noise
WO2000053138A1 (en) * 1999-03-11 2000-09-14 Mci Worldcom, Inc. System and method for ambient noise cancellation in a wireless communication device
US6360203B1 (en) 1999-05-24 2002-03-19 Db Systems, Inc. System and method for dynamic voice-discriminating noise filtering in aircraft
WO2001031972A1 (en) * 1999-10-22 2001-05-03 Andrea Electronics Corporation System and method for adaptive interference canceling
US6594367B1 (en) 1999-10-25 2003-07-15 Andrea Electronics Corporation Super directional beamforming design and implementation
US6882734B2 (en) 2001-02-14 2005-04-19 Gentex Corporation Vehicle accessory microphone
US7447320B2 (en) * 2001-02-14 2008-11-04 Gentex Corporation Vehicle accessory microphone
US8682005B2 (en) 1999-11-19 2014-03-25 Gentex Corporation Vehicle accessory microphone
US6980092B2 (en) * 2000-04-06 2005-12-27 Gentex Corporation Vehicle rearview mirror assembly incorporating a communication system
WO2002015539A1 (en) * 2000-08-10 2002-02-21 Paradyne Corporation Filter system and method to suppress interference imposed upon a frequency-division multiplexed channel
WO2002054823A2 (en) * 2001-01-04 2002-07-11 Audiophoric, Inc Apparatus, system and method for capturing sound
US7245726B2 (en) * 2001-10-03 2007-07-17 Adaptive Technologies, Inc. Noise canceling microphone system and method for designing the same
US20030095674A1 (en) * 2001-11-20 2003-05-22 Tokheim Corporation Microphone system for the fueling environment
US7079645B1 (en) * 2001-12-18 2006-07-18 Bellsouth Intellectual Property Corp. Speaker volume control for voice communication device
US6978010B1 (en) * 2002-03-21 2005-12-20 Bellsouth Intellectual Property Corp. Ambient noise cancellation for voice communication device
KR100500359B1 (en) * 2002-05-02 2005-07-19 주식회사 휴링스 A microphone unit for cancelling noise generated by vibration or shock on itself
US7167568B2 (en) * 2002-05-02 2007-01-23 Microsoft Corporation Microphone array signal enhancement
US7023379B2 (en) * 2003-04-03 2006-04-04 Gentex Corporation Vehicle rearview assembly incorporating a tri-band antenna module
CN1910823A (en) * 2003-05-19 2007-02-07 金泰克斯公司 Rearview mirror assemblies incorporating hands-free telephone components
US20040264726A1 (en) * 2003-06-30 2004-12-30 Gauger Daniel M. Microphoning
US7162212B2 (en) * 2003-09-22 2007-01-09 Agere Systems Inc. System and method for obscuring unwanted ambient noise and handset and central office equipment incorporating the same
US20050071158A1 (en) * 2003-09-25 2005-03-31 Vocollect, Inc. Apparatus and method for detecting user speech
US7496387B2 (en) * 2003-09-25 2009-02-24 Vocollect, Inc. Wireless headset for use in speech recognition environment
KR100532841B1 (en) * 2003-10-01 2005-12-02 삼성전자주식회사 Low noise transeiver
US7089042B2 (en) * 2004-01-08 2006-08-08 Fellowes, Inc. Headset with variable gain based on position of microphone boom
JP3904086B2 (en) * 2004-02-17 2007-04-11 日本電気株式会社 Mobile communication terminal
US7367422B2 (en) * 2004-05-21 2008-05-06 Brookstone Purchasing. Inc. System and method for providing passive noise reduction
US9807521B2 (en) * 2004-10-22 2017-10-31 Alan J. Werner, Jr. Method and apparatus for intelligent acoustic signal processing in accordance with a user preference
CN101180914B (en) * 2005-06-03 2011-11-02 诺基亚公司 Headset with adjustable boom
US8331603B2 (en) * 2005-06-03 2012-12-11 Nokia Corporation Headset
US8351632B2 (en) * 2005-08-23 2013-01-08 Analog Devices, Inc. Noise mitigating microphone system and method
US8130979B2 (en) * 2005-08-23 2012-03-06 Analog Devices, Inc. Noise mitigating microphone system and method
US8417185B2 (en) 2005-12-16 2013-04-09 Vocollect, Inc. Wireless headset and method for robust voice data communication
US7885419B2 (en) * 2006-02-06 2011-02-08 Vocollect, Inc. Headset terminal with speech functionality
US7773767B2 (en) 2006-02-06 2010-08-10 Vocollect, Inc. Headset terminal with rear stability strap
JP2007234896A (en) 2006-03-01 2007-09-13 Toyota Motor Corp Signal transmitting device
US20080147394A1 (en) * 2006-12-18 2008-06-19 International Business Machines Corporation System and method for improving an interactive experience with a speech-enabled system through the use of artificially generated white noise
US8355515B2 (en) * 2008-04-07 2013-01-15 Sony Computer Entertainment Inc. Gaming headset and charging method
US8818000B2 (en) 2008-04-25 2014-08-26 Andrea Electronics Corporation System, device, and method utilizing an integrated stereo array microphone
USD605629S1 (en) 2008-09-29 2009-12-08 Vocollect, Inc. Headset
US8135140B2 (en) 2008-11-20 2012-03-13 Harman International Industries, Incorporated System for active noise control with audio signal compensation
US9020158B2 (en) 2008-11-20 2015-04-28 Harman International Industries, Incorporated Quiet zone control system
US8718289B2 (en) * 2009-01-12 2014-05-06 Harman International Industries, Incorporated System for active noise control with parallel adaptive filter configuration
US8229126B2 (en) * 2009-03-13 2012-07-24 Harris Corporation Noise error amplitude reduction
US8189799B2 (en) * 2009-04-09 2012-05-29 Harman International Industries, Incorporated System for active noise control based on audio system output
US8199924B2 (en) 2009-04-17 2012-06-12 Harman International Industries, Incorporated System for active noise control with an infinite impulse response filter
US8077873B2 (en) 2009-05-14 2011-12-13 Harman International Industries, Incorporated System for active noise control with adaptive speaker selection
US8160287B2 (en) 2009-05-22 2012-04-17 Vocollect, Inc. Headset with adjustable headband
US8438659B2 (en) 2009-11-05 2013-05-07 Vocollect, Inc. Portable computing device and headset interface
CN101873363A (en) * 2010-06-09 2010-10-27 中兴通讯股份有限公司 Method and terminal for restraining noise by using double microphones
US9240195B2 (en) * 2010-11-25 2016-01-19 Goertek Inc. Speech enhancing method and device, and denoising communication headphone enhancing method and device, and denoising communication headphones
US9648421B2 (en) 2011-12-14 2017-05-09 Harris Corporation Systems and methods for matching gain levels of transducers
US20130211828A1 (en) * 2012-02-13 2013-08-15 General Motors Llc Speech processing responsive to active noise control microphones
US9264524B2 (en) 2012-08-03 2016-02-16 The Penn State Research Foundation Microphone array transducer for acoustic musical instrument
WO2014022280A1 (en) * 2012-08-03 2014-02-06 The Penn State Research Foundation Microphone array transducer for acoustic musical instrument
US20150365762A1 (en) * 2012-11-24 2015-12-17 Polycom, Inc. Acoustic perimeter for reducing noise transmitted by a communication device in an open-plan environment
JP6132910B2 (en) * 2013-06-11 2017-05-24 Toa株式会社 Microphone device
US9253556B1 (en) 2013-08-29 2016-02-02 ConcealFab Corporation Dissipative system for increasing audio entropy thereby diminishing auditory perception
CN104994454B (en) * 2015-06-26 2018-09-04 小米科技有限责任公司 A kind of terminal for call
US9668047B2 (en) * 2015-08-28 2017-05-30 Hyundai Motor Company Microphone
CN106782591B (en) * 2016-12-26 2021-02-19 惠州Tcl移动通信有限公司 Device and method for improving speech recognition rate under background noise
EP3628283A1 (en) * 2018-09-25 2020-04-01 GN Hearing A/S Hearing protection device with passive ear protectors

Family Cites Families (46)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2379514A (en) * 1942-09-30 1945-07-03 Charles B Fisher Microphone
US2972018A (en) * 1953-11-30 1961-02-14 Rca Corp Noise reduction system
US3098121A (en) * 1958-09-15 1963-07-16 Clark Co Inc David Automatic sound control
US3394226A (en) * 1963-08-19 1968-07-23 Daniel E. Andrews Jr. Special purpose hearing aid
GB1160431A (en) * 1966-05-04 1969-08-06 Mini Of Technology London Ear Defenders.
GB1289993A (en) * 1969-08-07 1972-09-20
US3890474A (en) * 1972-05-17 1975-06-17 Raymond C Glicksberg Sound amplitude limiters
GB1378294A (en) * 1972-11-06 1974-12-27 Cosmocord Ltd Separable ear defender
US3830988A (en) * 1972-12-21 1974-08-20 Roanwell Corp Noise canceling transmitter
US3889059A (en) * 1973-03-26 1975-06-10 Northern Electric Co Loudspeaking communication terminal apparatus and method of operation
FR2305909A1 (en) * 1975-03-28 1976-10-22 Dassault Electronique Microphones and associated equipment - include one unshielded microphone and one masked microphone, and electronics system to minimise noise background
US4334740A (en) * 1978-09-12 1982-06-15 Polaroid Corporation Receiving system having pre-selected directional response
JPS602837B2 (en) * 1979-12-20 1985-01-24 日本ビクター株式会社 Secondary sound pressure gradient unidirectional microphone system
US4463222A (en) * 1981-12-23 1984-07-31 Roanwell Corporation Noise canceling transmitter
DE3374514D1 (en) * 1982-01-27 1987-12-17 Racal Acoustics Ltd Improvements in and relating to communications systems
JPS5964994A (en) * 1982-10-05 1984-04-13 Matsushita Electric Ind Co Ltd Microphone device
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
US4752961A (en) * 1985-09-23 1988-06-21 Northern Telecom Limited Microphone arrangement
JPS62164400A (en) * 1986-01-14 1987-07-21 Hitachi Plant Eng & Constr Co Ltd Electronic silencer system
JP2602642B2 (en) * 1986-02-17 1997-04-23 アイワ株式会社 Directional microphone device
FR2595498B1 (en) * 1986-03-07 1989-06-02 Centre Nat Rech Scient METHODS AND DEVICES FOR MITIGATING EXTERNAL NOISE ARISING AT TYMPAN AND IMPROVING THE INTELLIGIBILITY OF ELECTROACOUSTIC COMMUNICATIONS
FR2604551B1 (en) * 1986-09-26 1988-12-30 Saint Louis Inst NOISE PROTECTION DEVICE
JPH01314098A (en) * 1988-06-13 1989-12-19 Foster Electric Co Ltd Surround headphone
US4985925A (en) * 1988-06-24 1991-01-15 Sensor Electronics, Inc. Active noise reduction system
JPH0270152A (en) * 1988-09-06 1990-03-09 Fujitsu Ltd Telephone set
US5125032A (en) * 1988-12-02 1992-06-23 Erwin Meister Talk/listen headset
US5091954A (en) * 1989-03-01 1992-02-25 Sony Corporation Noise reducing receiver device
US5138664A (en) * 1989-03-25 1992-08-11 Sony Corporation Noise reducing device
US5117461A (en) * 1989-08-10 1992-05-26 Mnc, Inc. Electroacoustic device for hearing needs including noise cancellation
US5001763A (en) * 1989-08-10 1991-03-19 Mnc Inc. Electroacoustic device for hearing needs including noise cancellation
US5134659A (en) * 1990-07-10 1992-07-28 Mnc, Inc. Method and apparatus for performing noise cancelling and headphoning
US5138663A (en) * 1989-08-10 1992-08-11 Mnc, Inc. Method and apparatus for performing noise cancelling and headphoning
JP2786278B2 (en) * 1989-11-28 1998-08-13 カルソニック株式会社 Active noise canceller
US5121426A (en) * 1989-12-22 1992-06-09 At&T Bell Laboratories Loudspeaking telephone station including directional microphone
US5276740A (en) * 1990-01-19 1994-01-04 Sony Corporation Earphone device
JPH03231599A (en) * 1990-02-07 1991-10-15 Toshiba Corp Active control type silencer
DE4008595A1 (en) * 1990-03-17 1991-09-19 Georg Ziegelbauer Microphone for close speech avoiding background noise - has two sound receivers at slight manual spacing in range of their sensitive surfaces
US5327506A (en) * 1990-04-05 1994-07-05 Stites Iii George M Voice transmission system and method for high ambient noise conditions
JPH06503897A (en) * 1990-09-14 1994-04-28 トッドター、クリス Noise cancellation system
DK50991A (en) * 1991-03-21 1992-09-22 Kirk Acoustics As PHONE DEVICE WITH A MICROPHONE
EP0509742B1 (en) * 1991-04-18 1997-08-27 Matsushita Electric Industrial Co., Ltd. Microphone apparatus
US5260997A (en) * 1991-10-31 1993-11-09 Acs Communications, Inc. Articulated headset
JPH05316587A (en) * 1992-05-08 1993-11-26 Sony Corp Microphone device
JP3097340B2 (en) * 1992-08-19 2000-10-10 ソニー株式会社 Headphone equipment
US5448637A (en) * 1992-10-20 1995-09-05 Pan Communications, Inc. Two-way communications earset
US5381473A (en) * 1992-10-29 1995-01-10 Andrea Electronics Corporation Noise cancellation apparatus

Also Published As

Publication number Publication date
FI972048A (en) 1997-07-07
BR9509782A (en) 1998-05-26
EP0792568A4 (en) 1998-07-08
EP0792568A1 (en) 1997-09-03
FI972048A0 (en) 1997-05-14
CN1172422A (en) 1998-02-04
US5673325A (en) 1997-09-30
MX9703511A (en) 1997-07-31
CA2204880C (en) 2001-05-29
JPH10509849A (en) 1998-09-22
WO1996015541A1 (en) 1996-05-23
AU4235996A (en) 1996-06-06
KR970707665A (en) 1997-12-01

Similar Documents

Publication Publication Date Title
CA2204880A1 (en) Noise cancellation apparatus
MY109919A (en) Noise cancellation apparatus
CA2228952A1 (en) Noise cancellation and noise reduction apparatus
CA2211994A1 (en) Apparatus and method for canceling acoustic echoes including non-linear distortions in loudspeaker telephones
WO1998004079A3 (en) Echo canceler for non-linear circuits
CA2099945A1 (en) Telephonic Headset Structure for Reducing Ambient Noise
CA2138698A1 (en) Telephone Set with Background Noise Suppression Function
WO1999011045A1 (en) Telephone handset noise suppression
CA2232316A1 (en) Apparatus and method for initiating a transaction having acoustic data receiver that filters human voice
CA2293911A1 (en) Echo cancelling/suppression for handsets
MY128422A (en) Active headset
EP0717547A3 (en) Automaticaly variable circuit of sound level of received voice signal in telephone
JPH09331377A (en) Noise cancellation circuit
EP0804011A3 (en) Hands-free communication apparatus
EP0129208A3 (en) Handsfree circuit for telephone instrument
EP0380290A3 (en) Voice communication link interface apparatus
CA2090681A1 (en) Noise-Cancelling Handset
EP0732838A3 (en) Acoustic echo cancellor
CN1736090A (en) Non-linear acoustic echo canceller
CA2335224A1 (en) Acoustic echo canceller
CA2263540A1 (en) Dynamic optimization of handsfree microphone gain
WO2000060830A3 (en) Mobile telephone
KR970056594A (en) Handfree Hearing Aid Phone
SE9501681D0 (en) telecommunications device
CA2134322A1 (en) Hands free noise canceling headset

Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed