GB1361739A - Echo canceller - Google Patents

Echo canceller

Info

Publication number
GB1361739A
GB1361739A GB4364372A GB4364372A GB1361739A GB 1361739 A GB1361739 A GB 1361739A GB 4364372 A GB4364372 A GB 4364372A GB 4364372 A GB4364372 A GB 4364372A GB 1361739 A GB1361739 A GB 1361739A
Authority
GB
United Kingdom
Prior art keywords
echo
signal
hybrid
transversal filter
expander
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
GB4364372A
Other languages
English (en)
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
Publication of GB1361739A publication Critical patent/GB1361739A/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)
GB4364372A 1971-09-20 1972-09-20 Echo canceller Expired GB1361739A (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
GB1361739A true GB1361739A (en) 1974-07-30

Family

ID=22665762

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4364372A Expired GB1361739A (en) 1971-09-20 1972-09-20 Echo canceller

Country Status (9)

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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2213686A (en) * 1987-12-09 1989-08-16 Racal Communications Equip Radio telephone terminal unit

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS535008B2 (OSRAM) * 1972-05-15 1978-02-23
JPS5028914A (OSRAM) * 1973-07-14 1975-03-24
FR2272544B1 (OSRAM) * 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
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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2213686A (en) * 1987-12-09 1989-08-16 Racal Communications Equip Radio telephone terminal unit

Also Published As

Publication number Publication date
IT975018B (it) 1974-07-20
CA959983A (en) 1974-12-24
US3780233A (en) 1973-12-18
NL7212368A (OSRAM) 1973-03-22
SE382897B (sv) 1976-02-16
JPS4839108A (OSRAM) 1973-06-08
FR2153340A1 (OSRAM) 1973-05-04
FR2153340B1 (OSRAM) 1976-10-29
DE2245542A1 (de) 1973-03-29

Similar Documents

Publication Publication Date Title
GB1361739A (en) Echo canceller
CA2088558A1 (en) Multi-channel echo cancellation with adaptive filters having selectable coefficient vectors
GB1343656A (OSRAM)
KR930007740Y1 (en) Full duplex speakerphone for radio and landline telephone
GB1203802A (en) Improvements in or relating to echo suppressors
CA2036078A1 (en) Sub-band acoustic echo canceller
GB1387074A (en) Loudspeaking telephone sets
IT1250972B (it) Apparecchio e procedimento per la correzione dello sfalsamento in cc per un ricevitore.
EP0400979A3 (en) Speakerphone with echo canceller-suppressor
ES417706A1 (es) Perfeccionamientos en la construccion de compensadores de ecos para un sistema de transmision de mensajes.
GB1205938A (en) Improvements in or relating to echo suppressors
CA2225203A1 (en) Hands-free telephone
GB1093965A (en) Echo suppressor
CA2102857A1 (en) Technique for Reducing Echoes in Conference Communications
GB2271698A (en) A method for eliminating accoustic echo in a communication device
US3508017A (en) Adaptive echo canceller with an output filter
US4542265A (en) Echo canceller dynamic range extension
EP0176262A3 (en) Bidirectional adaptive voice frequency repeater
US3175051A (en) Echo suppressor using comb filters
GB1026621A (en) Improvements in or relating to long distance communication systems
JPS6129178B2 (OSRAM)
GB1018941A (en) Echo suppressors in transmission systems
US2170941A (en) Transmission control in signaling systems
JPS5553965A (en) Loudspeading simultaneous talking interphone system
JPS645250A (en) Howling prevention circuit for loudspeaker system telephone set

Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee