KR920014338A - 에코우 캔셀러 - Google Patents

에코우 캔셀러 Download PDF

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Publication number
KR920014338A
KR920014338A KR1019910023283A KR910023283A KR920014338A KR 920014338 A KR920014338 A KR 920014338A KR 1019910023283 A KR1019910023283 A KR 1019910023283A KR 910023283 A KR910023283 A KR 910023283A KR 920014338 A KR920014338 A KR 920014338A
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KR
South Korea
Prior art keywords
input
passage
output
detection means
adjustment filter
Prior art date
Application number
KR1019910023283A
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English (en)
Other versions
KR100221251B1 (ko
Inventor
피터 얀세 코넬리스
안토니우스 마리아 반 데 라르 프란시스쿠스
Original Assignee
프레데릭 얀 스미트
엔.브이.필립스 글로아이람펜파브리켄
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.)
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Application filed by 프레데릭 얀 스미트, 엔.브이.필립스 글로아이람펜파브리켄 filed Critical 프레데릭 얀 스미트
Publication of KR920014338A publication Critical patent/KR920014338A/ko
Application granted granted Critical
Publication of KR100221251B1 publication Critical patent/KR100221251B1/ko

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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
    • H04B3/23—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other using a replica of transmitted signal in the time domain, e.g. echo cancellers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Filters That Use Time-Delay Elements (AREA)

Abstract

내용 없음

Description

에코우 캔셀러
본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음
제1도는 확성기 켈리폰 세트에 사용되는 에코우 캔셀러의 블럭 다이어그램, 제2도는 제1도에 도시된 에코우 캔셀러의 상태 다이어그램.

Claims (4)

  1. 각각 입/출력을 갖는 수신 통로 및 전송 통로를 구비하며, 수신 통로의 출력을 조정 수단을 포함하는 조정필터의 입력에 접속되며, 상기 조정 필터는 수신 통로의 출력과 전송 통로의 입력 사이에서 에코우 통로의 임펄스 응답 측정인 임펄스 응답을 가지며, 전송 통로의 입력은 감쇠 회로의 제1입력에 접속되며, 조정 필터의 출력은 감쇠회로의 제2입력에 접속되며, 상기 감쇠회로의 출력은 전송 통로와 출력에 접속되며, 또한 검출수단이 전송통로의 입력에서 국부적으로 발생된 신호를 검출하면 조정수단을 차단시키기 위해 제어신호를 발생하는 검출수단을 구비한 에코우 캔셀러에 잇어서, 상기 검출 수단은 전송 통로의 입력 신호전력과 조정 필터의 출력신호 전력과의 비율이 임계치를 초가할 경우에 니어-엔드 발생 신호를 검출하는 것을 특징으로 하는 에코우 캔셀러.
  2. 제1항에 있어서, 검출수단은 특정 주기상에서 평균화됨 상기 신호의 순서 전력에 기초하여 상기 2개 신호의 전력을 정하는 것을 특징으로 하는 에코우 캔셀러.
  3. 제1항 또는 제2항에 있어서, 검출수단은 비율을 계산하기 전에, 현 시점에서의 유효한 조정 필터 출력신호의 전력을 보정 기간에 가산하는 것을 특징으로 하는 에코우 캔셀러.
  4. 제3항에 있어서, 보정 기간은 조정필터 임펄스 응답기간에 감소된 순서치에서 종료하는 시간 간격내의 복수 측정시점에 있는 조정 필터 출력 신호의 전력 가중치가 가산된 합이며, 상기 가중치는 현재와 측정시간의 차가 지수함수적으로 감소하는 것을 특징으로 하는 에코우 캔셀러.
    ※ 참고사항 : 최초출원내용에 의하여 공개하는 것임.
KR1019910023283A 1990-12-18 1991-12-18 에코우 캔셀러 KR100221251B1 (ko)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL9002790A NL9002790A (nl) 1990-12-18 1990-12-18 Echocompensator met verbeterde dubbelspraak detectie.
NL9002790 1990-12-18

Publications (2)

Publication Number Publication Date
KR920014338A true KR920014338A (ko) 1992-07-30
KR100221251B1 KR100221251B1 (ko) 1999-09-15

Family

ID=19858162

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019910023283A KR100221251B1 (ko) 1990-12-18 1991-12-18 에코우 캔셀러

Country Status (7)

Country Link
US (1) US5390250A (ko)
EP (1) EP0491430B1 (ko)
JP (1) JP3186809B2 (ko)
KR (1) KR100221251B1 (ko)
DE (1) DE69114999T2 (ko)
HK (1) HK109696A (ko)
NL (1) NL9002790A (ko)

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US5452289A (en) 1993-01-08 1995-09-19 Multi-Tech Systems, Inc. Computer-based multifunction personal communications system
US6009082A (en) 1993-01-08 1999-12-28 Multi-Tech Systems, Inc. Computer-based multifunction personal communication system with caller ID
US5864560A (en) 1993-01-08 1999-01-26 Multi-Tech Systems, Inc. Method and apparatus for mode switching in a voice over data computer-based personal communications system
US5453986A (en) 1993-01-08 1995-09-26 Multi-Tech Systems, Inc. Dual port interface for a computer-based multifunction personal communication system
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JPH06232957A (ja) * 1993-01-29 1994-08-19 Toshiba Corp 音声通信装置
JPH06338829A (ja) * 1993-05-28 1994-12-06 American Teleph & Telegr Co <Att> 通信システム内の反響除去方法と装置
JP2576767B2 (ja) * 1993-09-10 1997-01-29 日本電気株式会社 エコー消去方法およびエコーキャンセラ
US5682386A (en) 1994-04-19 1997-10-28 Multi-Tech Systems, Inc. Data/voice/fax compression multiplexer
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US5664011A (en) * 1995-08-25 1997-09-02 Lucent Technologies Inc. Echo canceller with adaptive and non-adaptive filters
US5663955A (en) * 1995-08-25 1997-09-02 Lucent Technologies Inc. Echo canceller system with shared coefficient memory
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Also Published As

Publication number Publication date
JPH04275724A (ja) 1992-10-01
DE69114999T2 (de) 1996-06-27
NL9002790A (nl) 1992-07-16
HK109696A (en) 1996-07-05
JP3186809B2 (ja) 2001-07-11
KR100221251B1 (ko) 1999-09-15
DE69114999D1 (de) 1996-01-11
EP0491430A1 (en) 1992-06-24
US5390250A (en) 1995-02-14
EP0491430B1 (en) 1995-11-29

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