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JPS645233A - Echo canceller - Google Patents

Echo canceller

Info

Publication number
JPS645233A
JPS645233A JP16148987A JP16148987A JPS645233A JP S645233 A JPS645233 A JP S645233A JP 16148987 A JP16148987 A JP 16148987A JP 16148987 A JP16148987 A JP 16148987A JP S645233 A JPS645233 A JP S645233A
Authority
JP
Japan
Prior art keywords
attenuation
signal
adaptive
side attenuation
fed
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.)
Pending
Application number
JP16148987A
Other languages
Japanese (ja)
Inventor
Mitsuo Tsujikado
Ryoichi Miyamoto
Yoshio Ito
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.)
Oki Electric Industry Co Ltd
Original Assignee
Oki Electric Industry Co Ltd
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 Oki Electric Industry Co Ltd filed Critical Oki Electric Industry Co Ltd
Priority to JP16148987A priority Critical patent/JPS645233A/en
Publication of JPS645233A publication Critical patent/JPS645233A/en
Pending legal-status Critical Current

Links

Landscapes

  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

PURPOSE:To insert an atenuator surely independently of the signal level by controlling the variable attenuator circuit through the use of an adaptive operation inhibition signal of an adaptive digital filter. CONSTITUTION:In the presence of reception signal and at non double talk, a receiver side attenuation is 0dB and the sender side attenuation is 6dB. In detecting the absence of reception signal or double talk, as soon as a signal INH=1 inhibiting the adaptive operation of the adaptive digital filter ADF 102 is fed to the ADF 102 from the DTD 104, it is fed to an attenuation control section 108 of the variable attenuation circuit 106. The receiver side attenuation RATT(k) increases the attenuation sequentially from 0dB and reaches 6dB. On the other hand, the sender side attenuation SATT(k) is decreased gradually from 6dB to 0dB.
JP16148987A 1987-06-29 1987-06-29 Echo canceller Pending JPS645233A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16148987A JPS645233A (en) 1987-06-29 1987-06-29 Echo canceller

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16148987A JPS645233A (en) 1987-06-29 1987-06-29 Echo canceller

Publications (1)

Publication Number Publication Date
JPS645233A true JPS645233A (en) 1989-01-10

Family

ID=15736049

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16148987A Pending JPS645233A (en) 1987-06-29 1987-06-29 Echo canceller

Country Status (1)

Country Link
JP (1) JPS645233A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0727882A2 (en) * 1995-02-17 1996-08-21 Advanced Micro Devices, Inc. Echo cancellation and suppression
EP0840466A2 (en) * 1996-11-01 1998-05-06 Nec Corporation Echo canceller control in a satellite communication system
WO2009107750A1 (en) * 2008-02-29 2009-09-03 ヤマハ株式会社 Acoustic echo canceler

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59205833A (en) * 1983-05-09 1984-11-21 Nec Corp Device for suppressing stray signal
JPS6156526A (en) * 1984-08-28 1986-03-22 Toshiba Corp Echo signal eliminator

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59205833A (en) * 1983-05-09 1984-11-21 Nec Corp Device for suppressing stray signal
JPS6156526A (en) * 1984-08-28 1986-03-22 Toshiba Corp Echo signal eliminator

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0727882A2 (en) * 1995-02-17 1996-08-21 Advanced Micro Devices, Inc. Echo cancellation and suppression
EP0727882A3 (en) * 1995-02-17 2001-11-28 Advanced Micro Devices, Inc. Echo cancellation and suppression
EP0840466A2 (en) * 1996-11-01 1998-05-06 Nec Corporation Echo canceller control in a satellite communication system
EP0840466A3 (en) * 1996-11-01 2003-09-17 Nec Corporation Echo canceller control in a satellite communication system
WO2009107750A1 (en) * 2008-02-29 2009-09-03 ヤマハ株式会社 Acoustic echo canceler

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