CA1219649A - Echo cancelling system comprising cascade-connected local echo cancellers operable independently of one another - Google Patents

Echo cancelling system comprising cascade-connected local echo cancellers operable independently of one another

Info

Publication number
CA1219649A
CA1219649A CA000457200A CA457200A CA1219649A CA 1219649 A CA1219649 A CA 1219649A CA 000457200 A CA000457200 A CA 000457200A CA 457200 A CA457200 A CA 457200A CA 1219649 A CA1219649 A CA 1219649A
Authority
CA
Canada
Prior art keywords
echo
signal
local
cancelled
delayed
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.)
Expired
Application number
CA000457200A
Other languages
English (en)
French (fr)
Inventor
Yuisuke Maruyama
Yasuo Itoh
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
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 filed Critical NEC Corp
Application granted granted Critical
Publication of CA1219649A publication Critical patent/CA1219649A/en
Expired 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
    • H04B3/237—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 two adaptive filters, e.g. for near end and for end echo cancelling
    • 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
    • H04B3/238—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 initial training sequence

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Filters That Use Time-Delay Elements (AREA)
CA000457200A 1983-06-24 1984-06-22 Echo cancelling system comprising cascade-connected local echo cancellers operable independently of one another Expired CA1219649A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP113811/1983 1983-06-24
JP11381183A JPS605634A (ja) 1983-06-24 1983-06-24 エコ−キヤンセラ

Publications (1)

Publication Number Publication Date
CA1219649A true CA1219649A (en) 1987-03-24

Family

ID=14621643

Family Applications (1)

Application Number Title Priority Date Filing Date
CA000457200A Expired CA1219649A (en) 1983-06-24 1984-06-22 Echo cancelling system comprising cascade-connected local echo cancellers operable independently of one another

Country Status (3)

Country Link
JP (1) JPS605634A (ja)
CA (1) CA1219649A (ja)
FR (1) FR2549320B1 (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5471527A (en) 1993-12-02 1995-11-28 Dsc Communications Corporation Voice enhancement system and method

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL8603247A (nl) * 1986-12-22 1988-07-18 At & T & Philips Telecomm Adaptief tijd-discreet filter voor het vormen van een compensatiesignaal uit synchrone datasymbolen.
JPH05227110A (ja) * 1992-02-14 1993-09-03 Nippon Television Network Corp Ｓｎｇ用サイドトーン抑圧装置

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1180141A (en) * 1980-11-15 1984-12-27 Kenzo Takahashi Echo canceller system
JPS5784633A (en) * 1980-11-15 1982-05-27 Nippon Telegr & Teleph Corp <Ntt> Echo eraser
JPS5864830A (ja) * 1981-10-15 1983-04-18 Nippon Telegr & Teleph Corp <Ntt> 反響消去装置単位回路およびそれを用いた反響消去装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5471527A (en) 1993-12-02 1995-11-28 Dsc Communications Corporation Voice enhancement system and method

Also Published As

Publication number Publication date
FR2549320A1 (fr) 1985-01-18
JPS6343015B2 (ja) 1988-08-26
FR2549320B1 (fr) 1986-07-11
JPS605634A (ja) 1985-01-12

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Legal Events

Date Code Title Description
MKEX Expiry