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CA959983A - Adaptive echo cancellers with compandors - Google Patents

Adaptive echo cancellers with compandors

Info

Publication number
CA959983A
CA959983A CA150,884A CA150884A CA959983A CA 959983 A CA959983 A CA 959983A CA 150884 A CA150884 A CA 150884A CA 959983 A CA959983 A CA 959983A
Authority
CA
Canada
Prior art keywords
compandors
echo cancellers
adaptive echo
adaptive
cancellers
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.)
Expired
Application number
CA150,884A
Other languages
English (en)
Other versions
CA150884S (en
Inventor
Michael Onufry (Jr.)
Samuel J. Campanella
Henri G. Suyderhoud
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.)
Comsat Corp
Original Assignee
Comsat 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 Comsat Corp filed Critical Comsat Corp
Application granted granted Critical
Publication of CA959983A publication Critical patent/CA959983A/en
Expired legal-status Critical Current

Links

Classifications

    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
CA150,884A 1971-09-20 1972-09-05 Adaptive echo cancellers with compandors Expired CA959983A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US18177971A 1971-09-20 1971-09-20

Publications (1)

Publication Number Publication Date
CA959983A true CA959983A (en) 1974-12-24

Family

ID=22665762

Family Applications (1)

Application Number Title Priority Date Filing Date
CA150,884A Expired CA959983A (en) 1971-09-20 1972-09-05 Adaptive echo cancellers with compandors

Country Status (9)

Country Link
US (1) US3780233A (xx)
JP (1) JPS4839108A (xx)
CA (1) CA959983A (xx)
DE (1) DE2245542A1 (xx)
FR (1) FR2153340B1 (xx)
GB (1) GB1361739A (xx)
IT (1) IT975018B (xx)
NL (1) NL7212368A (xx)
SE (1) SE382897B (xx)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS535008B2 (xx) * 1972-05-15 1978-02-23
JPS5028914A (xx) * 1973-07-14 1975-03-24
FR2272544B1 (xx) * 1974-05-24 1977-03-11 Cit Alcatel
FR2517906A1 (fr) * 1981-12-03 1983-06-10 Centre Nat Rech Scient Annulateur d'echo a commande automatique de gain pour systemes de transmission
US4542265A (en) * 1983-05-20 1985-09-17 Gte Lenkurt Incorporated Echo canceller dynamic range extension
FR2569322B1 (fr) * 1984-08-17 1986-12-05 Trt Telecom Radio Electr Annuleur d'echo utilisant la modulation delta
GB2213686A (en) * 1987-12-09 1989-08-16 Racal Communications Equip Radio telephone terminal unit
US5157653A (en) * 1990-08-03 1992-10-20 Coherent Communications Systems Corp. Residual echo elimination with proportionate noise injection
US6028929A (en) * 1997-11-14 2000-02-22 Tellabs Operations, Inc. Echo canceller employing dual-H architecture having improved non-linear echo path detection
DE19815942A1 (de) * 1998-04-09 1999-10-14 Cit Alcatel Vielkanal-Echocanceller mit Compander
JP3293029B2 (ja) * 1999-08-20 2002-06-17 株式会社マイクロエムズ 通信装置用２線４線変換回路

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2825764A (en) * 1954-02-24 1958-03-04 Bell Telephone Labor Inc Cross-control compandor used as echo suppressors
US3500000A (en) * 1966-10-31 1970-03-10 Myldred P Kelly Self-adaptive echo canceller

Also Published As

Publication number Publication date
SE382897B (sv) 1976-02-16
JPS4839108A (xx) 1973-06-08
NL7212368A (xx) 1973-03-22
DE2245542A1 (de) 1973-03-29
US3780233A (en) 1973-12-18
FR2153340A1 (xx) 1973-05-04
IT975018B (it) 1974-07-20
FR2153340B1 (xx) 1976-10-29
GB1361739A (en) 1974-07-30

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