GB2075313B - Echo cancellers - Google Patents

Echo cancellers

Info

Publication number
GB2075313B
GB2075313B GB8110703A GB8110703A GB2075313B GB 2075313 B GB2075313 B GB 2075313B GB 8110703 A GB8110703 A GB 8110703A GB 8110703 A GB8110703 A GB 8110703A GB 2075313 B GB2075313 B GB 2075313B
Authority
GB
United Kingdom
Prior art keywords
echo cancellers
cancellers
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.)
Expired
Application number
GB8110703A
Other versions
GB2075313A (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.)
AT&T Corp
Original Assignee
Western Electric Co Inc
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 Western Electric Co Inc filed Critical Western Electric Co Inc
Publication of GB2075313A publication Critical patent/GB2075313A/en
Application granted granted Critical
Publication of GB2075313B publication Critical patent/GB2075313B/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
GB8110703A 1980-04-09 1981-04-06 Echo cancellers Expired GB2075313B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US13866380A 1980-04-09 1980-04-09

Publications (2)

Publication Number Publication Date
GB2075313A GB2075313A (en) 1981-11-11
GB2075313B true GB2075313B (en) 1984-05-02

Family

ID=22483068

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8110703A Expired GB2075313B (en) 1980-04-09 1981-04-06 Echo cancellers

Country Status (13)

Country Link
JP (1) JPS56157152A (en)
AU (1) AU540883B2 (en)
CA (1) CA1175521A (en)
CH (1) CH651980A5 (en)
DE (1) DE3113394C2 (en)
DK (1) DK149681A (en)
ES (1) ES8205088A1 (en)
FR (1) FR2480534B1 (en)
GB (1) GB2075313B (en)
IL (1) IL62600A (en)
IT (1) IT1137680B (en)
NL (1) NL8101741A (en)
SE (1) SE447437B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8542802B2 (en) 2007-02-15 2013-09-24 Global Tel*Link Corporation System and method for three-way call detection
US8731934B2 (en) 2007-02-15 2014-05-20 Dsi-Iti, Llc System and method for multi-modal audio mining of telephone conversations

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2534427A1 (en) * 1982-10-11 1984-04-13 Trt Telecom Radio Electr ECHO CANCER FOR DATA SIGNAL IN BASE STRIP
US4894820A (en) * 1987-03-24 1990-01-16 Oki Electric Industry Co., Ltd. Double-talk detection in an echo canceller
DE68924261T2 (en) * 1989-06-22 1996-03-21 Ibm Echo cancellation device with adaptation of the echo cancellation coefficients during full duplex transmission.
US6895086B2 (en) 2001-11-13 2005-05-17 Inmate Telephone, Inc. 3-Way call detection system and method
CA2534767A1 (en) 2003-08-05 2005-03-17 Inmate Telephone, Inc. Three-way call detection using steganography
EP1714398B8 (en) * 2004-01-29 2009-08-12 Nxp B.V. Echo canceller with interference-level controlled step size
US9225838B2 (en) 2009-02-12 2015-12-29 Value-Added Communications, Inc. System and method for detecting three-way call circumvention attempts
US8630726B2 (en) 2009-02-12 2014-01-14 Value-Added Communications, Inc. System and method for detecting three-way call circumvention attempts
US10572961B2 (en) 2016-03-15 2020-02-25 Global Tel*Link Corporation Detection and prevention of inmate to inmate message relay
US9609121B1 (en) 2016-04-07 2017-03-28 Global Tel*Link Corporation System and method for third party monitoring of voice and video calls
US10027797B1 (en) 2017-05-10 2018-07-17 Global Tel*Link Corporation Alarm control for inmate call monitoring
US10225396B2 (en) 2017-05-18 2019-03-05 Global Tel*Link Corporation Third party monitoring of a activity within a monitoring platform
US10860786B2 (en) 2017-06-01 2020-12-08 Global Tel*Link Corporation System and method for analyzing and investigating communication data from a controlled environment
US9930088B1 (en) 2017-06-22 2018-03-27 Global Tel*Link Corporation Utilizing VoIP codec negotiation during a controlled environment call

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3499999A (en) * 1966-10-31 1970-03-10 Bell Telephone Labor Inc Closed loop adaptive echo canceller using generalized filter networks
US4087654A (en) * 1975-11-28 1978-05-02 Bell Telephone Laboratories, Incorporated Echo canceller for two-wire full duplex data transmission
US4074086A (en) * 1976-09-07 1978-02-14 Bell Telephone Laboratories, Incorporated Joint adaptive echo canceller and equalizer for two-wire full-duplex data transmission
SE416367B (en) * 1976-09-07 1980-12-15 Western Electric Co EKOELIMINERINGSANORDNING
JPS5582551A (en) * 1978-12-15 1980-06-21 Nec Corp Echo cancel unit for two line type duplex data communication modem

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8542802B2 (en) 2007-02-15 2013-09-24 Global Tel*Link Corporation System and method for three-way call detection
US8731934B2 (en) 2007-02-15 2014-05-20 Dsi-Iti, Llc System and method for multi-modal audio mining of telephone conversations
US9552417B2 (en) 2007-02-15 2017-01-24 Global Tel*Link Corp. System and method for multi-modal audio mining of telephone conversations

Also Published As

Publication number Publication date
FR2480534A1 (en) 1981-10-16
AU540883B2 (en) 1984-12-06
DE3113394C2 (en) 1985-11-21
IT8120998A0 (en) 1981-04-08
IL62600A (en) 1983-11-30
GB2075313A (en) 1981-11-11
NL8101741A (en) 1981-11-02
SE447437B (en) 1986-11-10
AU6872281A (en) 1981-10-15
DE3113394A1 (en) 1982-05-06
JPS56157152A (en) 1981-12-04
FR2480534B1 (en) 1985-05-31
CA1175521A (en) 1984-10-02
SE8102048L (en) 1981-10-10
IT8120998A1 (en) 1982-10-08
IL62600A0 (en) 1981-06-29
ES501182A0 (en) 1982-06-16
ES8205088A1 (en) 1982-06-16
IT1137680B (en) 1986-09-10
CH651980A5 (en) 1985-10-15
DK149681A (en) 1981-10-10

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Legal Events

Date Code Title Description
PE20 Patent expired after termination of 20 years

Effective date: 20010405