JPS56132827A - Echo canceler - Google Patents

Echo canceler

Info

Publication number
JPS56132827A
JPS56132827A JP3708580A JP3708580A JPS56132827A JP S56132827 A JPS56132827 A JP S56132827A JP 3708580 A JP3708580 A JP 3708580A JP 3708580 A JP3708580 A JP 3708580A JP S56132827 A JPS56132827 A JP S56132827A
Authority
JP
Japan
Prior art keywords
terminal
output
memory
circuit
sent out
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
JP3708580A
Other languages
Japanese (ja)
Other versions
JPS6251528B2 (en
Inventor
Taku Arazeki
Kazuo Ochiai
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 JP3708580A priority Critical patent/JPS56132827A/en
Publication of JPS56132827A publication Critical patent/JPS56132827A/en
Publication of JPS6251528B2 publication Critical patent/JPS6251528B2/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 make it possible to remove an echo which is generated due to mismatching of the impedance at two-wire to four-wire conversion point, by use of a low-speed element, too, and also to obtain an echo canceler whose power consumption is low. CONSTITUTION:The consitution of active filters 10o-10k shown in figure 2 is shown in figure 3. In figure 3, a signal from the far end, which has been provided to the terminal X is stored in the memory 110. An estimation parameter is supplied to the memory 120, and its output is provided to the adder 170. A correction parameter which has been provided from the terminal C is corrected by the correcting amount counting 160, it is added to said 170, its output is added to the multiplier 130, and the output concerned is sent out to the terminal Y through the summing circuit 140. Also, the output of said memory 110 is sent out to the terminal XD through the register 190. In this regard, in figure 1, 600, 400 and 500 show a correcting information planning circuit, an adding circuit and a subtracting circuit, respectively.
JP3708580A 1980-03-24 1980-03-24 Echo canceler Granted JPS56132827A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3708580A JPS56132827A (en) 1980-03-24 1980-03-24 Echo canceler

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3708580A JPS56132827A (en) 1980-03-24 1980-03-24 Echo canceler

Publications (2)

Publication Number Publication Date
JPS56132827A true JPS56132827A (en) 1981-10-17
JPS6251528B2 JPS6251528B2 (en) 1987-10-30

Family

ID=12487707

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3708580A Granted JPS56132827A (en) 1980-03-24 1980-03-24 Echo canceler

Country Status (1)

Country Link
JP (1) JPS56132827A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5864830A (en) * 1981-10-15 1983-04-18 Nippon Telegr & Teleph Corp <Ntt> Echo erasing device
JPS58150336A (en) * 1982-03-02 1983-09-07 Nec Corp Echo canceler
JPS6076826A (en) * 1983-10-03 1985-05-01 Nec Corp Echo canceller

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
CONFERENCE RECORD 1976 INTERNATIONAL CONFERENCE ON COMMUNICATIONS=1976 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5864830A (en) * 1981-10-15 1983-04-18 Nippon Telegr & Teleph Corp <Ntt> Echo erasing device
JPS58150336A (en) * 1982-03-02 1983-09-07 Nec Corp Echo canceler
JPH0117613B2 (en) * 1982-03-02 1989-03-31 Nippon Electric Co
JPS6076826A (en) * 1983-10-03 1985-05-01 Nec Corp Echo canceller

Also Published As

Publication number Publication date
JPS6251528B2 (en) 1987-10-30

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