JPS4865813A - - Google Patents

Info

Publication number
JPS4865813A
JPS4865813A JP47016553A JP1655372A JPS4865813A JP S4865813 A JPS4865813 A JP S4865813A JP 47016553 A JP47016553 A JP 47016553A JP 1655372 A JP1655372 A JP 1655372A JP S4865813 A JPS4865813 A JP S4865813A
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.)
Granted
Application number
JP47016553A
Other languages
English (en)
Japanese (ja)
Other versions
JPS55760B2 (enrdf_load_stackoverflow
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; 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
    • 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)
JP1655372A 1971-12-03 1972-02-18 Expired JPS55760B2 (enrdf_load_stackoverflow)

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 true JPS4865813A (enrdf_load_stackoverflow) 1973-09-10
JPS55760B2 JPS55760B2 (enrdf_load_stackoverflow) 1980-01-09

Family

ID=22758195

Family Applications (1)

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

Country Status (5)

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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5942147A (en) * 1996-02-06 1999-08-24 Shinagawa Refractories Co., Ltd. Submerged nozzle replacing device

Families Citing this family (26)

* 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 (fr) * 1979-03-12 1980-10-10 Soumagne Joel Detecteur d'echo notamment pour systeme de communication a interpolation de parole
US4473906A (en) * 1980-12-05 1984-09-25 Lord Corporation Active acoustic attenuator
JPS583430A (ja) * 1981-06-30 1983-01-10 Nec Corp まわり込信号抑圧装置
JPH069000B2 (ja) * 1981-08-27 1994-02-02 キヤノン株式会社 音声情報処理方法
JPS5961321A (ja) * 1982-09-30 1984-04-07 Nec Corp エコ−信号抑圧装置
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
CA2049173C (en) * 1990-08-16 1996-06-25 Shoji Fujimoto Speech recognition apparatus
GB2281680B (en) * 1993-08-27 1998-08-26 Motorola Inc A voice activity detector for an echo suppressor and an echo suppressor
EP0881814A1 (de) * 1997-05-28 1998-12-02 Deutsche Telekom AG Verfahren zur Bestimmung des Schrifttweitenfaktors Alpha zur Einstellung der Adaptionsgeschwindigkeit des NMLS-Adaptionsalgorithmus
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 (de) 1999-09-08 2001-03-15 Volkswagen Ag Verfahren zum Betrieb einer Mehrfachmikrofonanordnung in einem Kraftfahrzeug sowie Mehrfachmikrofonanordnung selbst
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
EP3806489A4 (en) 2018-06-11 2021-08-11 Sony Group Corporation SIGNAL PROCESSING DEVICE, SIGNAL PROCESSING METHOD AND PROGRAM
CN112203188B (zh) * 2020-07-24 2021-10-01 北京工业大学 一种自动音量调节方法

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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5942147A (en) * 1996-02-06 1999-08-24 Shinagawa Refractories Co., Ltd. Submerged nozzle replacing device

Also Published As

Publication number Publication date
GB1369711A (en) 1974-10-09
JPS55760B2 (enrdf_load_stackoverflow) 1980-01-09
DE2207141B2 (enrdf_load_stackoverflow) 1980-10-09
US3784747A (en) 1974-01-08
DE2207141C3 (de) 1981-07-30
CA952439A (en) 1974-08-06
DE2207141A1 (de) 1973-08-02

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