JPS6429093A - Echo erasing device - Google Patents

Echo erasing device

Info

Publication number
JPS6429093A
JPS6429093A JP18361087A JP18361087A JPS6429093A JP S6429093 A JPS6429093 A JP S6429093A JP 18361087 A JP18361087 A JP 18361087A JP 18361087 A JP18361087 A JP 18361087A JP S6429093 A JPS6429093 A JP S6429093A
Authority
JP
Japan
Prior art keywords
tap
echo
signal
coefficient
echo signal
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
JP18361087A
Other languages
Japanese (ja)
Other versions
JP2542624B2 (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 JP62183610A priority Critical patent/JP2542624B2/en
Publication of JPS6429093A publication Critical patent/JPS6429093A/en
Application granted granted Critical
Publication of JP2542624B2 publication Critical patent/JP2542624B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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 assuming the reverberation time of an echo path with an initial training signal and variably setting a tap length in order to generate a pseudo echo signal in accordance with the reververating time. CONSTITUTION:A learning circuit 4 inputs the initial training signal outputted from a training circuit 3 and assumes the echo path characteristics of the echo path formed by an acoustical coupling between a speaker 1 and a microphone 2 in the form of an impulse response. A coefficient multiplier 6 multiplies each tap output of a tap delay line 5 by a tap coefficient, which constitutes the echo characteristics assumed at the learning circuit 4, and executes tap- coefficient-processing. An adder 7 adds each tap-coefficient-processed tap output and generates the pseudo echo signal. The pseudo echo signal is given to a subtracter 8 and the cancellation of the echo signal contained in an input sound signal is executed.
JP62183610A 1987-07-24 1987-07-24 Echo canceller Expired - Fee Related JP2542624B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62183610A JP2542624B2 (en) 1987-07-24 1987-07-24 Echo canceller

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62183610A JP2542624B2 (en) 1987-07-24 1987-07-24 Echo canceller

Publications (2)

Publication Number Publication Date
JPS6429093A true JPS6429093A (en) 1989-01-31
JP2542624B2 JP2542624B2 (en) 1996-10-09

Family

ID=16138805

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62183610A Expired - Fee Related JP2542624B2 (en) 1987-07-24 1987-07-24 Echo canceller

Country Status (1)

Country Link
JP (1) JP2542624B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011232691A (en) * 2010-04-30 2011-11-17 Honda Motor Co Ltd Dereverberation device and dereverberation method

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58114554A (en) * 1981-12-28 1983-07-07 Nec Corp Howling preventing device

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58114554A (en) * 1981-12-28 1983-07-07 Nec Corp Howling preventing device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011232691A (en) * 2010-04-30 2011-11-17 Honda Motor Co Ltd Dereverberation device and dereverberation method
US9002024B2 (en) 2010-04-30 2015-04-07 Honda Motor Co., Ltd. Reverberation suppressing apparatus and reverberation suppressing method

Also Published As

Publication number Publication date
JP2542624B2 (en) 1996-10-09

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Legal Events

Date Code Title Description
LAPS Cancellation because of no payment of annual fees