CA2139895A1 - Residual Echo Elimination with Proportionate Noise Injection - Google Patents

Residual Echo Elimination with Proportionate Noise Injection

Info

Publication number
CA2139895A1
CA2139895A1 CA 2139895 CA2139895A CA2139895A1 CA 2139895 A1 CA2139895 A1 CA 2139895A1 CA 2139895 CA2139895 CA 2139895 CA 2139895 A CA2139895 A CA 2139895A CA 2139895 A1 CA2139895 A1 CA 2139895A1
Authority
CA
Canada
Prior art keywords
signal
echo
error signal
attenuation
residual 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
CA 2139895
Other languages
French (fr)
Other versions
CA2139895C (en
Inventor
Roland Genter
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.)
Coriant Operations Inc
Original Assignee
Roland Genter
Coherent Communications Systems Corporation
Tellabs Operations, 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 Roland Genter, Coherent Communications Systems Corporation, Tellabs Operations, Inc. filed Critical Roland Genter
Publication of CA2139895A1 publication Critical patent/CA2139895A1/en
Application granted granted Critical
Publication of CA2139895C publication Critical patent/CA2139895C/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H04B3/234—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 double talk detection

Abstract

Residual echo from an echo canceller circuit is reduced by a variable attenuator that operates in response to a processing circuit which determines and adjusts an attenuation factor. The attenuation factor is determined by comparing relative levels of the send input signal, the receive input signal, and the error signal remaining after removal of an expected echo signal from the send input signal. The variable attenuator provides linear power attenuation of the error signal in order to reduce transmission of the residual echo signal and to eliminate the perception of coupling and decoupling of the telephone connection which occurs in known echo cancellers employing center clipping. A noise injection circuit provides a noise signal that is injected into the transmitted signal in inverse proportion to the attenuation of the error signal in order to provide a constant noise level in the transmitted signal as the error signal is variably attenuated.
CA002139895A 1990-08-03 1991-07-30 Residual echo elimination with proportionate noise injection Expired - Lifetime CA2139895C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US07/562,713 US5157653A (en) 1990-08-03 1990-08-03 Residual echo elimination with proportionate noise injection
US562,713 1990-08-03
CA002088684A CA2088684C (en) 1990-08-03 1991-07-30 Residual echo elimination with proportionate noise injection

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
CA002088684A Division CA2088684C (en) 1990-08-03 1991-07-30 Residual echo elimination with proportionate noise injection

Publications (2)

Publication Number Publication Date
CA2139895A1 true CA2139895A1 (en) 1992-02-04
CA2139895C CA2139895C (en) 1999-07-13

Family

ID=24247460

Family Applications (2)

Application Number Title Priority Date Filing Date
CA002088684A Expired - Lifetime CA2088684C (en) 1990-08-03 1991-07-30 Residual echo elimination with proportionate noise injection
CA002139895A Expired - Lifetime CA2139895C (en) 1990-08-03 1991-07-30 Residual echo elimination with proportionate noise injection

Family Applications Before (1)

Application Number Title Priority Date Filing Date
CA002088684A Expired - Lifetime CA2088684C (en) 1990-08-03 1991-07-30 Residual echo elimination with proportionate noise injection

Country Status (13)

Country Link
US (2) US5157653A (en)
EP (1) EP0542882B1 (en)
CN (1) CN1059628A (en)
AT (1) ATE166755T1 (en)
AU (1) AU650477B2 (en)
CA (2) CA2088684C (en)
DE (1) DE69129497T2 (en)
DK (1) DK0542882T3 (en)
ES (1) ES2117644T3 (en)
HU (1) HUT63279A (en)
IL (3) IL98963A (en)
MX (1) MX9100478A (en)
WO (1) WO1992002994A1 (en)

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Also Published As

Publication number Publication date
HU9300262D0 (en) 1993-06-28
MX9100478A (en) 1992-08-10
WO1992002994A1 (en) 1992-02-20
DE69129497T2 (en) 1998-11-05
AU650477B2 (en) 1994-06-23
EP0542882B1 (en) 1998-05-27
ES2117644T3 (en) 1998-08-16
EP0542882A4 (en) 1993-08-11
HUT63279A (en) 1993-07-28
AU8435291A (en) 1992-03-02
IL98963A (en) 1995-01-24
CA2088684C (en) 1995-04-11
ATE166755T1 (en) 1998-06-15
DK0542882T3 (en) 1999-03-22
DE69129497D1 (en) 1998-07-02
IL111106A (en) 1995-10-31
CA2139895C (en) 1999-07-13
US5283784A (en) 1994-02-01
CA2088684A1 (en) 1992-02-04
CN1059628A (en) 1992-03-18
EP0542882A1 (en) 1993-05-26
US5157653A (en) 1992-10-20
IL98963A0 (en) 1992-07-15
IL111106A0 (en) 1994-11-28

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