AU540883B2 - Line echo cancelling apparatus - Google Patents

Line echo cancelling apparatus

Info

Publication number
AU540883B2
AU540883B2 AU68722/81A AU6872281A AU540883B2 AU 540883 B2 AU540883 B2 AU 540883B2 AU 68722/81 A AU68722/81 A AU 68722/81A AU 6872281 A AU6872281 A AU 6872281A AU 540883 B2 AU540883 B2 AU 540883B2
Authority
AU
Australia
Prior art keywords
echo cancelling
line echo
cancelling apparatus
line
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.)
Ceased
Application number
AU68722/81A
Other versions
AU6872281A (en
Inventor
David Duncan Falconer
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 AU6872281A publication Critical patent/AU6872281A/en
Application granted granted Critical
Publication of AU540883B2 publication Critical patent/AU540883B2/en
Anticipated expiration legal-status Critical
Ceased 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)
  • Bidirectional Digital Transmission (AREA)
AU68722/81A 1980-04-09 1981-03-25 Line echo cancelling apparatus Ceased AU540883B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US13866380A 1980-04-09 1980-04-09
US138663 1980-04-09

Publications (2)

Publication Number Publication Date
AU6872281A AU6872281A (en) 1981-10-15
AU540883B2 true AU540883B2 (en) 1984-12-06

Family

ID=22483068

Family Applications (1)

Application Number Title Priority Date Filing Date
AU68722/81A Ceased AU540883B2 (en) 1980-04-09 1981-03-25 Line echo cancelling apparatus

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)

Families Citing this family (16)

* 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
EP0403716B1 (en) * 1989-06-22 1995-09-13 International Business Machines Corporation Echo cancelling device providing adjustment of the echo canceller 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
JP4836032B2 (en) 2004-01-29 2011-12-14 エスティー‐エリクソン、ソシエテ、アノニム Echo canceller with step size controlled by the level of interference
US8542802B2 (en) 2007-02-15 2013-09-24 Global Tel*Link Corporation System and method for three-way call detection
US20080201158A1 (en) 2007-02-15 2008-08-21 Johnson Mark D System and method for visitation management in a controlled-access environment
US8630726B2 (en) 2009-02-12 2014-01-14 Value-Added Communications, Inc. System and method for detecting three-way call circumvention attempts
US9225838B2 (en) 2009-02-12 2015-12-29 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

Also Published As

Publication number Publication date
DE3113394C2 (en) 1985-11-21
ES501182A0 (en) 1982-06-16
DE3113394A1 (en) 1982-05-06
FR2480534A1 (en) 1981-10-16
CH651980A5 (en) 1985-10-15
GB2075313B (en) 1984-05-02
FR2480534B1 (en) 1985-05-31
AU6872281A (en) 1981-10-15
IL62600A0 (en) 1981-06-29
IT8120998A0 (en) 1981-04-08
IT1137680B (en) 1986-09-10
IT8120998A1 (en) 1982-10-08
ES8205088A1 (en) 1982-06-16
NL8101741A (en) 1981-11-02
SE8102048L (en) 1981-10-10
CA1175521A (en) 1984-10-02
IL62600A (en) 1983-11-30
GB2075313A (en) 1981-11-11
DK149681A (en) 1981-10-10
SE447437B (en) 1986-11-10
JPS56157152A (en) 1981-12-04

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