GB2253771B - A method and device for echo cancellation in a transmission device, such as a modem - Google Patents

A method and device for echo cancellation in a transmission device, such as a modem

Info

Publication number
GB2253771B
GB2253771B GB9125366A GB9125366A GB2253771B GB 2253771 B GB2253771 B GB 2253771B GB 9125366 A GB9125366 A GB 9125366A GB 9125366 A GB9125366 A GB 9125366A GB 2253771 B GB2253771 B GB 2253771B
Authority
GB
United Kingdom
Prior art keywords
modem
echo cancellation
transmission device
transmission
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 - Fee Related
Application number
GB9125366A
Other versions
GB2253771A (en
GB9125366D0 (en
Inventor
Heikki Laamanen
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.)
Nokia Oyj
Original Assignee
Nokia Oyj
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 Nokia Oyj filed Critical Nokia Oyj
Publication of GB9125366D0 publication Critical patent/GB9125366D0/en
Publication of GB2253771A publication Critical patent/GB2253771A/en
Application granted granted Critical
Publication of GB2253771B publication Critical patent/GB2253771B/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • 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)
GB9125366A 1990-11-28 1991-11-28 A method and device for echo cancellation in a transmission device, such as a modem Expired - Fee Related GB2253771B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FI905864A FI87869C (en) 1990-11-28 1990-11-28 Method and apparatus for removing echoes in a transmission device such as modems

Publications (3)

Publication Number Publication Date
GB9125366D0 GB9125366D0 (en) 1992-01-29
GB2253771A GB2253771A (en) 1992-09-16
GB2253771B true GB2253771B (en) 1994-10-26

Family

ID=8531480

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9125366A Expired - Fee Related GB2253771B (en) 1990-11-28 1991-11-28 A method and device for echo cancellation in a transmission device, such as a modem

Country Status (4)

Country Link
DE (1) DE4138567C2 (en)
FI (1) FI87869C (en)
GB (1) GB2253771B (en)
SE (1) SE515940C2 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0691756A1 (en) * 1994-07-07 1996-01-10 Siemens-Albis Aktiengesellschaft Echo canceller with analogue coarse canceller and digital fine canceller
US5649010A (en) * 1994-07-20 1997-07-15 Siemens Schweiz Ag Send filter for an echo canceler
FI102444B1 (en) * 1997-02-14 1998-11-30 Tellabs Oy Procedure for correcting form errors in multiphase pulses in pulse frequency transmission caused by pulse density modulation
GB2396279A (en) * 2002-12-09 2004-06-16 Acuid Corp Simultaneous bidirectional differential signalling interface with echo cancellation
US7702004B2 (en) 2002-12-09 2010-04-20 Alexander Roger Deas Simultaneous bidirectional differential signalling interface

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4605826A (en) * 1982-06-23 1986-08-12 Nec Corporation Echo canceler with cascaded filter structure
US4669116A (en) * 1982-12-09 1987-05-26 Regents Of The University Of California Non-linear echo cancellation of data signals

Also Published As

Publication number Publication date
SE9103511D0 (en) 1991-11-27
FI905864A0 (en) 1990-11-28
FI87869C (en) 1993-02-25
FI905864A (en) 1992-05-29
SE9103511L (en) 1992-05-29
DE4138567A1 (en) 1992-06-04
DE4138567C2 (en) 2000-12-14
GB2253771A (en) 1992-09-16
FI87869B (en) 1992-11-13
SE515940C2 (en) 2001-10-29
GB9125366D0 (en) 1992-01-29

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20041128