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JPS55760B2 - - Google Patents
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JPS55760B2 - - Google Patents

Info

Publication number
JPS55760B2
JPS55760B2 JP1655372A JP1655372A JPS55760B2 JP S55760 B2 JPS55760 B2 JP S55760B2 JP 1655372 A JP1655372 A JP 1655372A JP 1655372 A JP1655372 A JP 1655372A JP S55760 B2 JPS55760 B2 JP S55760B2
Authority
JP
Japan
Prior art keywords
signal
undesired
delay
parameter
gain
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.)
Expired
Application number
JP1655372A
Other languages
Japanese (ja)
Other versions
JPS4865813A (en
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 filed Critical
Publication of JPS4865813A publication Critical patent/JPS4865813A/ja
Publication of JPS55760B2 publication Critical patent/JPS55760B2/ja
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching
    • H04M9/08—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic
    • H04M9/082—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic using echo cancellers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/20—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching
    • H04M9/08—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic
    • H04M9/087—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic using different frequency bands for transmitting and receiving paths ; using phase shifting arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers
    • H04R3/02—Circuits for transducers for preventing acoustic reaction, i.e. acoustic oscillatory feedback
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
    • G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
    • G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
    • G10L21/0208—Noise filtering
    • G10L2021/02082—Noise filtering the noise being echo, reverberation of the speech
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
    • G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
    • G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
    • G10L21/0208—Noise filtering
    • G10L2021/02087—Noise filtering the noise being separate speech, e.g. cocktail party

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Telephone Function (AREA)
  • Circuit For Audible Band Transducer (AREA)

Abstract

Speech signal energy from an undesired source is suppressed by extracting from the undesired signal a delay parameter and a gain parameter. These parameters control a delay and gain network through which both the desired and undesired signals are routed. The delayed, amplified signal, when applied to a subtractor along with the undelayed signal, suppresses the undesired signal. The invention is applied to several hands-free telephony situations and to the suppression of one of two speakers in a room.
JP1655372A 1971-12-03 1972-02-18 Expired JPS55760B2 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US20450971A 1971-12-03 1971-12-03

Publications (2)

Publication Number Publication Date
JPS4865813A JPS4865813A (en) 1973-09-10
JPS55760B2 true JPS55760B2 (en) 1980-01-09

Family

ID=22758195

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1655372A Expired JPS55760B2 (en) 1971-12-03 1972-02-18

Country Status (5)

Country Link
US (1) US3784747A (en)
JP (1) JPS55760B2 (en)
CA (1) CA952439A (en)
DE (1) DE2207141C3 (en)
GB (1) GB1369711A (en)

Families Citing this family (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1458663A (en) * 1972-12-15 1976-12-15 Ard Anstalt Microphone circuits
US4024358A (en) * 1975-10-31 1977-05-17 Communications Satellite Corporation (Comsat) Adaptive echo canceller using differential pulse code modulation encoding
US4031338A (en) * 1976-02-10 1977-06-21 Communications Satellite Corporation (Comsat) Echo suppressor using frequency-selective center clipping
US4122303A (en) * 1976-12-10 1978-10-24 Sound Attenuators Limited Improvements in and relating to active sound attenuation
US4166924A (en) * 1977-05-12 1979-09-04 Bell Telephone Laboratories, Incorporated Removing reverberative echo components in speech signals
CA1123955A (en) * 1978-03-30 1982-05-18 Tetsu Taguchi Speech analysis and synthesis apparatus
FR2451676A1 (en) * 1979-03-12 1980-10-10 Soumagne Joel ECHO DETECTOR IN PARTICULAR FOR SPEECH INTERPOLATION COMMUNICATION SYSTEM
US4473906A (en) * 1980-12-05 1984-09-25 Lord Corporation Active acoustic attenuator
JPS583430A (en) * 1981-06-30 1983-01-10 Nec Corp Suppressing device of detouring signal
JPH069000B2 (en) * 1981-08-27 1994-02-02 キヤノン株式会社 Voice information processing method
JPS5961321A (en) * 1982-09-30 1984-04-07 Nec Corp Echo signal suppressor
DE3364531D1 (en) * 1982-10-15 1986-08-21 British Telecomm Noise control circuit
US4629829A (en) * 1984-12-14 1986-12-16 Motorola, Inc. Full duplex speakerphone for radio and landline telephones
US4819263A (en) * 1986-06-30 1989-04-04 Cellular Communications Corporation Apparatus and method for hands free telephonic communication
DE69101527T2 (en) * 1990-08-16 1994-07-14 Fujitsu Ten Ltd Speech recognition device for a vehicle with a microphone arrangement for locating the seat, from which a command comes.
GB2281680B (en) * 1993-08-27 1998-08-26 Motorola Inc A voice activity detector for an echo suppressor and an echo suppressor
US5942147A (en) * 1996-02-06 1999-08-24 Shinagawa Refractories Co., Ltd. Submerged nozzle replacing device
EP0881814A1 (en) * 1997-05-28 1998-12-02 Deutsche Telekom AG Method for determining the step size Alpha for adjusting the convergence speed in the NLMS algorithm
SG71035A1 (en) * 1997-08-01 2000-03-21 Bitwave Pte Ltd Acoustic echo canceller
US6442275B1 (en) 1998-09-17 2002-08-27 Lucent Technologies Inc. Echo canceler including subband echo suppressor
DE19942868A1 (en) 1999-09-08 2001-03-15 Volkswagen Ag Method for operating a multiple microphone arrangement in a motor vehicle and a multiple microphone arrangement itself
US6243322B1 (en) * 1999-11-05 2001-06-05 Wavemakers Research, Inc. Method for estimating the distance of an acoustic signal
US7043014B2 (en) * 2002-05-22 2006-05-09 Avaya Technology Corp. Apparatus and method for time-alignment of two signals
US7027593B2 (en) * 2002-05-22 2006-04-11 Avaya Technology Corp. Apparatus and method for echo control
US7734034B1 (en) 2005-06-21 2010-06-08 Avaya Inc. Remote party speaker phone detection
CN112237008B (en) * 2018-06-11 2022-06-03 索尼公司 Signal processing apparatus, signal processing method, and computer-readable storage medium
CN112203188B (en) * 2020-07-24 2021-10-01 北京工业大学 A method of automatic volume adjustment

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3177489A (en) * 1960-01-11 1965-04-06 Thompson Ramo Wooldridge Inc Interference suppression systems
US3133990A (en) * 1962-04-27 1964-05-19 Altec Lansing Corp Automatic level-adjustment circuit
GB1172089A (en) * 1965-09-29 1969-11-26 Superior Continental Corp A Communication System
US3631520A (en) * 1968-08-19 1971-12-28 Bell Telephone Labor Inc Predictive coding of speech signals
US3644674A (en) * 1969-06-30 1972-02-22 Bell Telephone Labor Inc Ambient noise suppressor
US3601549A (en) * 1969-11-25 1971-08-24 Bell Telephone Labor Inc Switching circuit for cancelling the direct sound transmission from the loudspeaker to the microphone in a loudspeaking telephone set

Also Published As

Publication number Publication date
DE2207141C3 (en) 1981-07-30
GB1369711A (en) 1974-10-09
JPS4865813A (en) 1973-09-10
DE2207141B2 (en) 1980-10-09
US3784747A (en) 1974-01-08
CA952439A (en) 1974-08-06
DE2207141A1 (en) 1973-08-02

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