JPS56102135A - Echo signal canceler - Google Patents

Echo signal canceler

Info

Publication number
JPS56102135A
JPS56102135A JP430780A JP430780A JPS56102135A JP S56102135 A JPS56102135 A JP S56102135A JP 430780 A JP430780 A JP 430780A JP 430780 A JP430780 A JP 430780A JP S56102135 A JPS56102135 A JP S56102135A
Authority
JP
Japan
Prior art keywords
input signal
alpha
accumulator
input
correction circuit
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
JP430780A
Other languages
Japanese (ja)
Inventor
Tadamichi Kawasaki
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP430780A priority Critical patent/JPS56102135A/en
Publication of JPS56102135A publication Critical patent/JPS56102135A/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

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 obtain a focusing speed which is similar to that of the learning identifying method, by cutting over proportional constant alpha which is given to the correction circuit in accordance with the reception input signal level. CONSTITUTION:Reception input signal series Xj which has been input through terminal 4 and digitalized at A/D converter 5 is input into X register 6 and, at the same time, also input into absolute value circuit 11 and absolute values for every sample value are obtained. The output of this circuit 11 is input into accumulator 12, by performing cumulative addition for a prescribed number of samples at the accumulator, and thus the level of reception input signal is obtained. Then, by inputting the output of accumulator 12 into address decoder 13, address decoder 13 selects and reads one alpha out of a plural number of alphak stored in alpha-register 14 and supplies it to correction circuit 8. By this, by cutting over proportional constant alpha which is given to the correction circuit in accordance with the reception input signal level, a focusing speed which is similar to that of learning identifying method is obtained.
JP430780A 1980-01-18 1980-01-18 Echo signal canceler Pending JPS56102135A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP430780A JPS56102135A (en) 1980-01-18 1980-01-18 Echo signal canceler

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP430780A JPS56102135A (en) 1980-01-18 1980-01-18 Echo signal canceler

Publications (1)

Publication Number Publication Date
JPS56102135A true JPS56102135A (en) 1981-08-15

Family

ID=11580833

Family Applications (1)

Application Number Title Priority Date Filing Date
JP430780A Pending JPS56102135A (en) 1980-01-18 1980-01-18 Echo signal canceler

Country Status (1)

Country Link
JP (1) JPS56102135A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5961233A (en) * 1982-09-29 1984-04-07 Nec Corp Adaptive type echo erasing device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5961233A (en) * 1982-09-29 1984-04-07 Nec Corp Adaptive type echo erasing device

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