JPS5494219A - Adaptive echo eraser - Google Patents

Adaptive echo eraser

Info

Publication number
JPS5494219A
JPS5494219A JP127978A JP127978A JPS5494219A JP S5494219 A JPS5494219 A JP S5494219A JP 127978 A JP127978 A JP 127978A JP 127978 A JP127978 A JP 127978A JP S5494219 A JPS5494219 A JP S5494219A
Authority
JP
Japan
Prior art keywords
gain correction
digital filter
signal
fed
terminal
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
JP127978A
Other languages
Japanese (ja)
Other versions
JPS6138659B2 (en
Inventor
Hidenori Ito
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co Ltd
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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP127978A priority Critical patent/JPS5494219A/en
Publication of JPS5494219A publication Critical patent/JPS5494219A/en
Publication of JPS6138659B2 publication Critical patent/JPS6138659B2/ja
Granted 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)

Abstract

PURPOSE:To suppress the accuracy of digital filter and tap gain correction circuit while obtaining the same echo erasing amount as conventional system, by applying noise when the echo path characteristics are measured and estimated. CONSTITUTION:The reception signal X from the terminal 1 and the transmission signal Y from the terminal 3 are fed to the A/D converter 5 and are converted into digital signals X' and Y'. X' is fed to the gain correction circuit 8 and the digital filter 9. The digital filter 9 synthesizes the approximate echo signal anti-Y from X'. The addition circuit 6 outputs the erase residual signal e by subtracting anti-Y from Y'. E is outputted from the terminal 4 after it is converted into analog signal with the D/A converter 7. Simultaneously, e is fed to the tap gain correction circuit 8 and forms the tap gain correction amount DELTAh of the digital filter 9 with X'. When noise N is added to DELTAh, it can be closer to e o
JP127978A 1978-01-09 1978-01-09 Adaptive echo eraser Granted JPS5494219A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP127978A JPS5494219A (en) 1978-01-09 1978-01-09 Adaptive echo eraser

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP127978A JPS5494219A (en) 1978-01-09 1978-01-09 Adaptive echo eraser

Publications (2)

Publication Number Publication Date
JPS5494219A true JPS5494219A (en) 1979-07-25
JPS6138659B2 JPS6138659B2 (en) 1986-08-30

Family

ID=11497005

Family Applications (1)

Application Number Title Priority Date Filing Date
JP127978A Granted JPS5494219A (en) 1978-01-09 1978-01-09 Adaptive echo eraser

Country Status (1)

Country Link
JP (1) JPS5494219A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5912639A (en) * 1982-07-12 1984-01-23 Toshiba Corp Echo canceler

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5912639A (en) * 1982-07-12 1984-01-23 Toshiba Corp Echo canceler

Also Published As

Publication number Publication date
JPS6138659B2 (en) 1986-08-30

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