JPS6412648A - Echo canceller - Google Patents

Echo canceller

Info

Publication number
JPS6412648A
JPS6412648A JP16694687A JP16694687A JPS6412648A JP S6412648 A JPS6412648 A JP S6412648A JP 16694687 A JP16694687 A JP 16694687A JP 16694687 A JP16694687 A JP 16694687A JP S6412648 A JPS6412648 A JP S6412648A
Authority
JP
Japan
Prior art keywords
circuits
circuit
converter
tap
echo
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
JP16694687A
Other languages
Japanese (ja)
Inventor
Shoji Makino
Nobuo Koizumi
Hiroshi Oikawa
Masakazu Nishino
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.)
Nippon Telegraph and Telephone Corp
Original Assignee
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 Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP16694687A priority Critical patent/JPS6412648A/en
Publication of JPS6412648A publication Critical patent/JPS6412648A/en
Pending legal-status Critical Current

Links

Landscapes

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

Abstract

PURPOSE:To maintain a large echo cancellation quantity with a small scale of hardware by storing only fewer tap only among tap numbers of a transmission characteristic of a circuit deducting a storage circuit. CONSTITUTION:The titled canceller consists of a reception input terminal 1, a speaker 2, n-set of microphones 301-30n, a transmission output terminal 4, a training signal source 5, an A/D converter 6, a deduction circuit (N-tap) 7, a pseudo echo path (FIR filter) 8, an A/D converter 9, a subtractor 10, a D/A converter 11, n-set of gain adjusting circuits 121-12n, adders 13, 16 and n-set of gain adjusting circuits 181-18n. Then storage circuits 191-19n are circuits storing the m-set of taps (m<N) from the beginning among transmission characteristics (impulse response) of the deduction circuit 7. Thus, the echo is cancelled without decreasing the conventional quantity of echo cancellation by using storage circuits with less hardware scale.
JP16694687A 1987-07-06 1987-07-06 Echo canceller Pending JPS6412648A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16694687A JPS6412648A (en) 1987-07-06 1987-07-06 Echo canceller

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16694687A JPS6412648A (en) 1987-07-06 1987-07-06 Echo canceller

Publications (1)

Publication Number Publication Date
JPS6412648A true JPS6412648A (en) 1989-01-17

Family

ID=15840562

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16694687A Pending JPS6412648A (en) 1987-07-06 1987-07-06 Echo canceller

Country Status (1)

Country Link
JP (1) JPS6412648A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5027393A (en) * 1988-06-20 1991-06-25 Nec Corporation Voice conference system using echo cancellers
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.
WO2018230062A1 (en) * 2017-06-12 2018-12-20 株式会社オーディオテクニカ Voice signal processing device, voice signal processing method and voice signal processing program

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5027393A (en) * 1988-06-20 1991-06-25 Nec Corporation Voice conference system using echo cancellers
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
WO2018230062A1 (en) * 2017-06-12 2018-12-20 株式会社オーディオテクニカ Voice signal processing device, voice signal processing method and voice signal processing program
CN110741563A (en) * 2017-06-12 2020-01-31 铁三角有限公司 Speech signal processing device, speech signal processing method, and speech signal processing program
JPWO2018230062A1 (en) * 2017-06-12 2020-05-21 株式会社オーディオテクニカ Audio signal processing device, audio signal processing method, and audio signal processing program
CN110741563B (en) * 2017-06-12 2021-11-23 铁三角有限公司 Speech signal processing apparatus, method and storage medium thereof
US11227618B2 (en) 2017-06-12 2022-01-18 Audio-Technica Corporation Sound signal processing device, sound signal processing method and sound signal processing program
JP2022125069A (en) * 2017-06-12 2022-08-26 株式会社オーディオテクニカ Voice signal processing device and voice signal processing method

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