GB2002203A - Echo cancellers - Google Patents

Echo cancellers

Info

Publication number
GB2002203A
GB2002203A GB7829666A GB7829666A GB2002203A GB 2002203 A GB2002203 A GB 2002203A GB 7829666 A GB7829666 A GB 7829666A GB 7829666 A GB7829666 A GB 7829666A GB 2002203 A GB2002203 A GB 2002203A
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.)
Granted
Application number
GB7829666A
Other versions
GB2002203B (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.)
Post Office
Original Assignee
Post Office
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 Post Office filed Critical Post Office
Publication of GB2002203A publication Critical patent/GB2002203A/en
Application granted granted Critical
Publication of GB2002203B publication Critical patent/GB2002203B/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
GB7829666A 1977-07-12 1978-07-12 Echo cancellers Expired GB2002203B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US05/814,942 US4113997A (en) 1977-07-12 1977-07-12 Analog to digital signal of logarithmic format converter and analog to pseudo-rms value converter and echo canceller utilizing same

Publications (2)

Publication Number Publication Date
GB2002203A true GB2002203A (en) 1979-02-14
GB2002203B GB2002203B (en) 1982-03-17

Family

ID=25216411

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7829666A Expired GB2002203B (en) 1977-07-12 1978-07-12 Echo cancellers

Country Status (9)

Country Link
US (1) US4113997A (en)
JP (1) JPS5852376B2 (en)
AU (1) AU515946B2 (en)
BR (1) BR7804506A (en)
CA (1) CA1120165A (en)
DE (1) DE2830370A1 (en)
FR (1) FR2454232A1 (en)
GB (1) GB2002203B (en)
IT (1) IT1108118B (en)

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4145661A (en) * 1977-12-28 1979-03-20 Canadian Patents And Development Limited Precision measuring amplifier
US4196421A (en) * 1978-01-03 1980-04-01 Lynch Communication Systems, Inc. PCM encoder with variable set-up intervals
US4283770A (en) * 1979-10-09 1981-08-11 Tellabs, Inc. Signal processor for digital echo canceller
FR2490901A1 (en) * 1980-09-19 1982-03-26 Trt Telecom Radio Electr DIGITAL ECHO CANCER WITH ANALOGUE-DIGITAL CONVERTER WITH ADJUSTABLE DYNAMIC
FR2496364A1 (en) * 1980-12-17 1982-06-18 Trt Telecom Radio Electr ECHO CANCELLATOR FOR DIGITAL TELEPHONE TRANSMISSION IMPLEMENTING A PSEUDO-LOGARITHMIC ENCODING LAW
US4549290A (en) * 1983-06-10 1985-10-22 Bell David B Voice/data digital, duplex link
NL8402918A (en) * 1984-09-25 1986-04-16 Philips Nv LEVEL INDICATOR.
JPS61151652A (en) * 1984-12-26 1986-07-10 Konishiroku Photo Ind Co Ltd Automatic developing device
JPS6320150U (en) * 1986-07-24 1988-02-09
JPH0738002B2 (en) * 1986-08-19 1995-04-26 パイオニア株式会社 Digital level display
EP0313706B1 (en) * 1987-10-30 1992-04-29 International Business Machines Corporation Analog-to-digital and digital-to-analog conversion system and echo cancellation device including the same
US4912758A (en) * 1988-10-26 1990-03-27 International Business Machines Corporation Full-duplex digital speakerphone
US5157653A (en) * 1990-08-03 1992-10-20 Coherent Communications Systems Corp. Residual echo elimination with proportionate noise injection
US5580409A (en) * 1992-08-11 1996-12-03 E. Khashoggi Industries Methods for manufacturing articles of manufacture from hydraulically settable sheets
US6028929A (en) * 1997-11-14 2000-02-22 Tellabs Operations, Inc. Echo canceller employing dual-H architecture having improved non-linear echo path detection
EP1251355B1 (en) * 2001-04-18 2007-12-05 Gennum Corporation Digital quasi-rms detector
FR2920931B1 (en) * 2007-09-11 2009-11-06 Thales Sa METHOD OF OPTIMIZING RESOURCES USED IN A SATELLITE OR AIRCRAFT TELECOMMUNICATIONS SYSTEM
FR2956785B1 (en) * 2010-02-23 2012-03-30 St Microelectronics Sa LOGARITHMIC TYPE ANALOG / DIGITAL CONVERSION METHOD OF AN ANALOGUE INPUT SIGNAL, AND CORRESPONDING DEVICE
US9917593B2 (en) * 2015-12-16 2018-03-13 Intrinsix Corp. Logarithmic analog to digital converter devices and methods thereof

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2397961A (en) * 1943-02-01 1946-04-09 Sperry Gyroscope Co Inc Detector
US3194951A (en) * 1962-05-24 1965-07-13 David H Schaefer Logarithmic converter
US3875344A (en) * 1973-03-15 1975-04-01 Westinghouse Electric Corp Digital data compression method and system
JPS5197364A (en) * 1975-02-22 1976-08-26
US4064379A (en) * 1976-06-11 1977-12-20 Communications Satellite Corporation Logarithmic echo canceller

Also Published As

Publication number Publication date
IT1108118B (en) 1985-12-02
IT7868651A0 (en) 1978-07-12
JPS5440018A (en) 1979-03-28
BR7804506A (en) 1979-04-17
DE2830370A1 (en) 1979-01-25
CA1120165A (en) 1982-03-16
US4113997A (en) 1978-09-12
FR2454232B1 (en) 1983-11-04
FR2454232A1 (en) 1980-11-07
GB2002203B (en) 1982-03-17
AU515946B2 (en) 1981-05-07
JPS5852376B2 (en) 1983-11-22
AU3787278A (en) 1980-01-10
DE2830370C2 (en) 1991-05-29

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Legal Events

Date Code Title Description
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PE20 Patent expired after termination of 20 years

Effective date: 19980711