JPS55135432A - Adaptive echo eraser - Google Patents

Adaptive echo eraser

Info

Publication number
JPS55135432A
JPS55135432A JP4280979A JP4280979A JPS55135432A JP S55135432 A JPS55135432 A JP S55135432A JP 4280979 A JP4280979 A JP 4280979A JP 4280979 A JP4280979 A JP 4280979A JP S55135432 A JPS55135432 A JP S55135432A
Authority
JP
Japan
Prior art keywords
signal
led
circuit
converter
transmission
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.)
Pending
Application number
JP4280979A
Other languages
Japanese (ja)
Inventor
Yukio Hagiwara
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 JP4280979A priority Critical patent/JPS55135432A/en
Publication of JPS55135432A publication Critical patent/JPS55135432A/en
Pending 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
    • H04B3/234—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

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 omit the A/D converter of the transmission side by obtaining the transmission signal based on the artificial echo signal and the residual signal and then giving the comparison between the transmission signal and the digital-coded reception signal in order to detect the two-way talking. CONSTITUTION:Both transmission signal y and artificial echo signal y' are led to adder circuit 121 to deliver residual signal e. Signal e is then led to A/D converter 113 to be converted into digital code e' and then led to correction circuit 133 as well as adder circuit 122. Artificial echo signal y'' delivered from adaptive circuit 132 plus residual signal e' are led to adder circuit 122 to deliver transmission signal y'''. Reception signal x is led to A/D converter 114 to be converted into digital code x' and then led to two-way talking detector circuit 131. Thus the two-way talking is detected via signal y''' to give the control to circuit 132.
JP4280979A 1979-04-09 1979-04-09 Adaptive echo eraser Pending JPS55135432A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4280979A JPS55135432A (en) 1979-04-09 1979-04-09 Adaptive echo eraser

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4280979A JPS55135432A (en) 1979-04-09 1979-04-09 Adaptive echo eraser

Publications (1)

Publication Number Publication Date
JPS55135432A true JPS55135432A (en) 1980-10-22

Family

ID=12646278

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4280979A Pending JPS55135432A (en) 1979-04-09 1979-04-09 Adaptive echo eraser

Country Status (1)

Country Link
JP (1) JPS55135432A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5374309A (en) * 1976-12-14 1978-07-01 Nec Corp Adaptive echo eraser

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5374309A (en) * 1976-12-14 1978-07-01 Nec Corp Adaptive echo eraser

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