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GB8523031D0 - Reducing echo in digital switching system - Google Patents

Reducing echo in digital switching system

Info

Publication number
GB8523031D0
GB8523031D0 GB858523031A GB8523031A GB8523031D0 GB 8523031 D0 GB8523031 D0 GB 8523031D0 GB 858523031 A GB858523031 A GB 858523031A GB 8523031 A GB8523031 A GB 8523031A GB 8523031 D0 GB8523031 D0 GB 8523031D0
Authority
GB
United Kingdom
Prior art keywords
switching system
digital switching
reducing echo
echo
reducing
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.)
Withdrawn
Application number
GB858523031A
Other versions
GB2164828A (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.)
International Standard Electric Corp
Original Assignee
International Standard Electric 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 International Standard Electric Corp filed Critical International Standard Electric Corp
Publication of GB8523031D0 publication Critical patent/GB8523031D0/en
Publication of GB2164828A publication Critical patent/GB2164828A/en
Withdrawn legal-status Critical Current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
    • H04B3/237—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 using two adaptive filters, e.g. for near end and for end echo cancelling
    • 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
    • H04B3/231—Echo cancellers using readout of a memory to provide the echo replica

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Interface Circuits In Exchanges (AREA)
GB08523031A 1984-09-21 1985-09-18 A method of reducing echo in a digital switching system and a digital hybrid therefor Withdrawn GB2164828A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US65374384A 1984-09-21 1984-09-21

Publications (2)

Publication Number Publication Date
GB8523031D0 true GB8523031D0 (en) 1985-10-23
GB2164828A GB2164828A (en) 1986-03-26

Family

ID=24622141

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08523031A Withdrawn GB2164828A (en) 1984-09-21 1985-09-18 A method of reducing echo in a digital switching system and a digital hybrid therefor

Country Status (3)

Country Link
AU (1) AU4695485A (en)
ES (1) ES8704057A1 (en)
GB (1) GB2164828A (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3768975D1 (en) * 1986-01-30 1991-05-08 Siemens Ag Echo compensator.
NL8701633A (en) * 1987-07-10 1989-02-01 Philips Nv DIGITAL ECHO COMPENSATOR.
DE69533375T2 (en) * 1994-05-06 2005-07-28 Ntt Docomo Inc. Echo canceller and echo path estimation method
SE505150C3 (en) * 1995-10-18 1997-08-04 Ericsson Telefon Ab L M Adaptive dual filter echo leakage procedure
FI104524B (en) * 1997-04-18 2000-02-15 Nokia Mobile Phones Ltd Echo Elimination System and Procedure and Mobile Telephony
US6965640B2 (en) 2001-08-08 2005-11-15 Octasic Inc. Method and apparatus for generating a set of filter coefficients providing adaptive noise reduction
US6999509B2 (en) 2001-08-08 2006-02-14 Octasic Inc. Method and apparatus for generating a set of filter coefficients for a time updated adaptive filter
US6970896B2 (en) * 2001-08-08 2005-11-29 Octasic Inc. Method and apparatus for generating a set of filter coefficients
US6957240B2 (en) * 2001-08-08 2005-10-18 Octasic Inc. Method and apparatus for providing an error characterization estimate of an impulse response derived using least squares

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3787645A (en) * 1971-05-19 1974-01-22 Nippon Electric Co Echo canceller having two echo path models

Also Published As

Publication number Publication date
ES8704057A1 (en) 1987-02-16
AU4695485A (en) 1986-03-27
ES547190A0 (en) 1987-02-16
GB2164828A (en) 1986-03-26

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Legal Events

Date Code Title Description
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)