JPS548910A - Echo erasing unit - Google Patents

Echo erasing unit

Info

Publication number
JPS548910A
JPS548910A JP7462577A JP7462577A JPS548910A JP S548910 A JPS548910 A JP S548910A JP 7462577 A JP7462577 A JP 7462577A JP 7462577 A JP7462577 A JP 7462577A JP S548910 A JPS548910 A JP S548910A
Authority
JP
Japan
Prior art keywords
erasing unit
echo erasing
echo
artifical
rejecting
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
JP7462577A
Other languages
Japanese (ja)
Other versions
JPS6129178B2 (en
Inventor
Mutsuya Tajima
Takashi Ogiwara
Shunji Tanaka
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 JP7462577A priority Critical patent/JPS548910A/en
Publication of JPS548910A publication Critical patent/JPS548910A/en
Publication of JPS6129178B2 publication Critical patent/JPS6129178B2/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 improve the S/N for a remote caller and to increase the quality of communication, by rejecting the noise from artifical echo line when the reception signal is absent, through the provision of a variable in the correction loop.
JP7462577A 1977-06-22 1977-06-22 Echo erasing unit Granted JPS548910A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7462577A JPS548910A (en) 1977-06-22 1977-06-22 Echo erasing unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7462577A JPS548910A (en) 1977-06-22 1977-06-22 Echo erasing unit

Publications (2)

Publication Number Publication Date
JPS548910A true JPS548910A (en) 1979-01-23
JPS6129178B2 JPS6129178B2 (en) 1986-07-04

Family

ID=13552552

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7462577A Granted JPS548910A (en) 1977-06-22 1977-06-22 Echo erasing unit

Country Status (1)

Country Link
JP (1) JPS548910A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5943637A (en) * 1982-07-30 1984-03-10 コミユニケイシヨンズ・サテライト・コ−ポレイシヨン Echo canceller
JPS59205833A (en) * 1983-05-09 1984-11-21 Nec Corp Device for suppressing stray signal
JPS6076823A (en) * 1983-10-03 1985-05-01 Nec Corp Center clipper
JPS61252722A (en) * 1985-04-30 1986-11-10 インタ−ナショナル　ビジネス　マシ−ンズ　コ−ポレ−ション Removal of residual echo

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5943637A (en) * 1982-07-30 1984-03-10 コミユニケイシヨンズ・サテライト・コ−ポレイシヨン Echo canceller
US4600815A (en) * 1982-07-30 1986-07-15 Communications Satellite Corporation Automatic gain control for echo cancellers and similar adaptive systems
JPS59205833A (en) * 1983-05-09 1984-11-21 Nec Corp Device for suppressing stray signal
JPS6076823A (en) * 1983-10-03 1985-05-01 Nec Corp Center clipper
JPS61252722A (en) * 1985-04-30 1986-11-10 インタ−ナショナル　ビジネス　マシ−ンズ　コ−ポレ−ション Removal of residual echo

Also Published As

Publication number Publication date
JPS6129178B2 (en) 1986-07-04

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