KR890003156A - 디지탈 에코 삭제기 - Google Patents

디지탈 에코 삭제기 Download PDF

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Publication number
KR890003156A
KR890003156A KR1019880008398A KR880008398A KR890003156A KR 890003156 A KR890003156 A KR 890003156A KR 1019880008398 A KR1019880008398 A KR 1019880008398A KR 880008398 A KR880008398 A KR 880008398A KR 890003156 A KR890003156 A KR 890003156A
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South Korea
Prior art keywords
filter
signal
digital
echo
input
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KR1019880008398A
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English (en)
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KR960004696B1 (en
Inventor
요세푸스 반 게르벤 페트루스
안토니우스 마리아 반 데라르 프란시스쿠스
얀 코트만스 핸드리크
Original Assignee
이반 밀러 레르너
엔.브이.필립스 글로아이람펜파브리켄
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Publication of KR890003156A publication Critical patent/KR890003156A/ko
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Publication of KR960004696B1 publication Critical patent/KR960004696B1/ko

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • 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
    • H04B3/237—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 using two adaptive filters, e.g. for near end and for end echo cancelling
    • 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
    • H04B3/234—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 using double talk detection
    • 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
    • H04B3/238—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 using initial training sequence
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S367/00—Communications, electrical: acoustic wave systems and devices
    • Y10S367/901—Noise or unwanted signal reduction in nonseismic receiving system

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

디지털 에코 삭제기
본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음
제 3도는 본 발명에 따른 디지털 에코 삭제기의 분리-시간 모델 실시예의 일반적 도시도. 제 2도는 발명에 따른 디지털 에코 삭제기의 분리-시간 모델 실시예의 더욱 상세한 도시도.

Claims (4)

  1. 수신 입력과 수신 출력 사이에 수신 통로와 송신 입력과 송신 출력 사이에 송신 통로를 갖고, 수신 입력에 공급된 수신 입력에 응답하여 발생된 송신 입력에서 어딥티브 에코 신호를 지우는데 사용하는 디지탈 에코 삭제기는, 필터 결합 포함과, 제 1복제 신호가 에코 신호 평가치의 수신 입력 신호에 응답하여 발생하는 프로그램 가능한 필터 계수 메모리를 갖는 제 1 디지털 필터와, 제 2복제 신호가 에코 신호 평가치의 입력 신호에 응답하여 발생하는 필터 계수 메모리를 갖는 제 2적응 디지탈 필터와, 상기 제 2디지탈 필터는 제 2복제 신호와 송신 입력에 공급되는 신호 차이인 대표적인 에러 신호 형성용 수단과, 제 2디지털 필터의 필터 계수 메모리를 위해 수정된 필터 계수 공급과 에러 신호와 수신 입력 신호에 응답해 수정되어 적응되는 필터 계수용 적응 처리기 수단과, 제 1복제 신호와 송신 입력에 공급되는 신호와의 차에 대한 송신 출력 형성 수단과, 제 1디지털 필터의 필터 계수 메모리 프로그램은 가능하게 하기 위해 선택적으로 수정된 필터 계수를 공급하는 제어 가능한 게이트 수단과, 송신 신호 및 각각의 에러 신호 레벨을 결정하고 각각의 레벨 사이에서 예정된 방법에 의해 게이트 방법용 제어 신호를 발생하는 레벨에 응답해 발생하는 수단을 구비하는 에코 삭제기에 있어서, 상기 필터 연결 제 2디지털 필터는 N1성분 길이를 갖는 주파수-영역블럭-적응 필터와, P=0,1,2....N1-1을 갖는 만은 N1주파수-영역 필터 계수 W(P:m), 각각의 신호 블럭m을 갖고 있고 제 1디지탈 필터는 N1를 넘는 N 및 i=0,1,2,...N-1을 갖는 많은 N시간-영역 필터 계수와, 에코 삭제기는 변형 수단, 직렬 게이트 수단, N시간-영역 필터 계수 W(i:m)형성을 위해 N1주파수-영역 필터 계수 W(P:m)블럭의 N-1-점 분리 직교 변환 성분처럼 제 1디지탈 필터에 요구되는 것을 특징으로 하는 디지탈 에코 삭제기.
  2. 제 1항에 있어서, 상기 에코 삭제기는 제 2제어 가능한 게이트 수단의 직렬 배열 및 제 1디지탈 필터의 프로그램 기능한 필터 계수 메모리내에 N필터 계수 W(i:m)의 분리 직교 변환 성분처럼 N1주파수-영역 필터 계수 W(P:m)형성을 위한 제 2변형 수단과 이들 형성된 필터 계수 W(P:m)이 제 2디지탈 필터로 선택적으로 피드백하는 수단과, 제어 수단은 또한 각각의 수신 입력 신호 레벨을 결정하는 블럭 형태 및 송신 입력 신호와 수신 입력 신호 레벨이 송신 입력 신호 레벨 결정보다 낮을 때 제 2게이트 수단 개방에 대한 제 2제어 신호 발생에 대해 배열된 것을 특징으로 하는 디지탈 에코 삭제기.
  3. 선행된 항중 어느 한 항에 있어서, 제 1디지털 필터의 프로그램 가능한 필터 계수 메모리는 입력되는 많은 N필터 계수 W(i:m)가 에코 통로 임펄스 응답의 제 1의 근사값으로 표시되는 것에 의해 프로그램되는 것을 특징으로 하는 디지탈 에코 삭제기.
  4. 선행된 항중 어느 한 항에 있어서, 확성이 텔리폰 셋의 부분을 특징으로 하는 디지탈 에코 삭제기.
    ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.
KR88008398A 1987-07-10 1988-07-07 Digital echo canceller KR960004696B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL8701633 1987-07-10
NL8701633A NL8701633A (nl) 1987-07-10 1987-07-10 Digitale echocompensator.

Publications (2)

Publication Number Publication Date
KR890003156A true KR890003156A (ko) 1989-04-13
KR960004696B1 KR960004696B1 (en) 1996-04-11

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Application Number Title Priority Date Filing Date
KR88008398A KR960004696B1 (en) 1987-07-10 1988-07-07 Digital echo canceller

Country Status (7)

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US (1) US4903247A (ko)
EP (1) EP0301627B1 (ko)
JP (1) JP2936101B2 (ko)
KR (1) KR960004696B1 (ko)
CA (1) CA1318003C (ko)
DE (1) DE3880228T2 (ko)
NL (1) NL8701633A (ko)

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KR960004696B1 (en) 1996-04-11
CA1318003C (en) 1993-05-18
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NL8701633A (nl) 1989-02-01
DE3880228T2 (de) 1993-10-14
EP0301627A1 (en) 1989-02-01

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