JPS6429096A - Echo canceling device - Google Patents

Echo canceling device

Info

Publication number
JPS6429096A
JPS6429096A JP18361487A JP18361487A JPS6429096A JP S6429096 A JPS6429096 A JP S6429096A JP 18361487 A JP18361487 A JP 18361487A JP 18361487 A JP18361487 A JP 18361487A JP S6429096 A JPS6429096 A JP S6429096A
Authority
JP
Japan
Prior art keywords
microphone
adaptive filter
echo
path characteristics
echo path
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
JP18361487A
Other languages
Japanese (ja)
Other versions
JP2509629B2 (en
Inventor
Hiroshi Oikawa
Shoji Makino
Shigenobu Minami
Takashi Saeki
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.)
Toshiba Corp
Nippon Telegraph and Telephone Corp
Original Assignee
Toshiba Corp
Nippon Telegraph and Telephone 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 Toshiba Corp, Nippon Telegraph and Telephone Corp filed Critical Toshiba Corp
Priority to JP18361487A priority Critical patent/JP2509629B2/en
Publication of JPS6429096A publication Critical patent/JPS6429096A/en
Application granted granted Critical
Publication of JP2509629B2 publication Critical patent/JP2509629B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Landscapes

  • Circuit For Audible Band Transducer (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

PURPOSE:To effectively cancel an echo signal by controlling so that the switching of an on-mike can be executed in synchronization with the completion of an initial setting to the adaptive filter of the echo path characteristics for the microphone. CONSTITUTION:A speaker 1 and plural microphones 2a-2n are acoustically coupled. When the microphone, whose input signal level exceeds a prescribed threshold, is detected out of plural microphone 2a-2n, the echo path characteristics, which are obtained in respect of the microphone, are obtained from coefficient memories 14a-14n and set to an adaptive filter 5. The microphone, whose input signal level exceeds the prescribed threshold, is set as the on-mike in synchronization with the completion of the initial setting for the adaptive filter of the echo path characteristics. The echo signal is canceled by a subtracter 6.
JP18361487A 1987-07-24 1987-07-24 Echo canceller Expired - Lifetime JP2509629B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18361487A JP2509629B2 (en) 1987-07-24 1987-07-24 Echo canceller

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18361487A JP2509629B2 (en) 1987-07-24 1987-07-24 Echo canceller

Publications (2)

Publication Number Publication Date
JPS6429096A true JPS6429096A (en) 1989-01-31
JP2509629B2 JP2509629B2 (en) 1996-06-26

Family

ID=16138868

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18361487A Expired - Lifetime JP2509629B2 (en) 1987-07-24 1987-07-24 Echo canceller

Country Status (1)

Country Link
JP (1) JP2509629B2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2785482A1 (en) * 1998-10-28 2000-05-05 France Telecom Echo sound reduction hands free/distant sound signal process having microphones spaced apart and phase/amplitude detector with separator unit loudspeakers passing reduced echo signal.
JP2006304032A (en) * 2005-04-22 2006-11-02 Yamaha Corp Sound reinforcement system
JP2006340151A (en) * 2005-06-03 2006-12-14 Matsushita Electric Ind Co Ltd Acoustic echo canceling device, telephone using it, and acoustic echo canceling method
US8238547B2 (en) 2004-05-11 2012-08-07 Sony Corporation Sound pickup apparatus and echo cancellation processing method

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2785482A1 (en) * 1998-10-28 2000-05-05 France Telecom Echo sound reduction hands free/distant sound signal process having microphones spaced apart and phase/amplitude detector with separator unit loudspeakers passing reduced echo signal.
EP1014669A1 (en) * 1998-10-28 2000-06-28 France Telecom Acoustic system for echo cancellation
US6724899B1 (en) * 1998-10-28 2004-04-20 France Telecom S.A. Sound pick-up and reproduction system for reducing an echo resulting from acoustic coupling between a sound pick-up and a sound reproduction device
US8238547B2 (en) 2004-05-11 2012-08-07 Sony Corporation Sound pickup apparatus and echo cancellation processing method
JP2006304032A (en) * 2005-04-22 2006-11-02 Yamaha Corp Sound reinforcement system
JP2006340151A (en) * 2005-06-03 2006-12-14 Matsushita Electric Ind Co Ltd Acoustic echo canceling device, telephone using it, and acoustic echo canceling method

Also Published As

Publication number Publication date
JP2509629B2 (en) 1996-06-26

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