JPS5784633A - Echo eraser - Google Patents

Echo eraser

Info

Publication number
JPS5784633A
JPS5784633A JP16011080A JP16011080A JPS5784633A JP S5784633 A JPS5784633 A JP S5784633A JP 16011080 A JP16011080 A JP 16011080A JP 16011080 A JP16011080 A JP 16011080A JP S5784633 A JPS5784633 A JP S5784633A
Authority
JP
Japan
Prior art keywords
terminal
circuit
echo
input
cascade
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
JP16011080A
Other languages
Japanese (ja)
Other versions
JPS6113416B2 (en
Inventor
Kenzo Takahashi
Takashi Sakamoto
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.)
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone 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 Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP16011080A priority Critical patent/JPS5784633A/en
Priority to CA000389640A priority patent/CA1180141A/en
Priority to US06/319,783 priority patent/US4480156A/en
Priority to GB8133755A priority patent/GB2090708B/en
Priority to FR8121047A priority patent/FR2495410B1/en
Priority to NL8105146A priority patent/NL8105146A/en
Priority to DE19813145419 priority patent/DE3145419A1/en
Publication of JPS5784633A publication Critical patent/JPS5784633A/en
Publication of JPS6113416B2 publication Critical patent/JPS6113416B2/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
    • 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

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 enable circuit integration with an arbitrary circuit scale suitable for the requirements on a communication system, low cost and high quality, by connecting echo erasing unit circuits of the same constitution in cascade. CONSTITUTION:An input of an echo erasing unit circuit 42 at a terminal 3 is transmitted to an external transmission line 43 from a terminal 4, and inputted to a terminal 1 at transmission side via 2/4 wire converter and outputted from a terminal 2 after processing of subtraction. The device is provided with the final tap for a circuit corresponding to tapped delay line in the circuit 42, a convolutional integrating circuit for the determination of tap coefficient, a divider, a square adder and input/output terminals 14, 16, 27, 35-37, 39-41 to correct the amount of echo ek at the terminal 2 to the input at the terminal 3 through external connection between terminals to zero. Unit circuits 42, 42', 42'' having the same constitution are connected in cascade, allowing to make echo erase having the amount of delay of a integer multiple.
JP16011080A 1980-11-15 1980-11-15 Echo eraser Granted JPS5784633A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
JP16011080A JPS5784633A (en) 1980-11-15 1980-11-15 Echo eraser
CA000389640A CA1180141A (en) 1980-11-15 1981-11-06 Echo canceller system
US06/319,783 US4480156A (en) 1980-11-15 1981-11-09 Echo canceller system
GB8133755A GB2090708B (en) 1980-11-15 1981-11-09 Echo canceller system
FR8121047A FR2495410B1 (en) 1980-11-15 1981-11-10 ECHO CANCELLER
NL8105146A NL8105146A (en) 1980-11-15 1981-11-13 ECHO ELIMINATION SYSTEM.
DE19813145419 DE3145419A1 (en) 1980-11-15 1981-11-16 ECHOLOE SYSTEM

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16011080A JPS5784633A (en) 1980-11-15 1980-11-15 Echo eraser

Publications (2)

Publication Number Publication Date
JPS5784633A true JPS5784633A (en) 1982-05-27
JPS6113416B2 JPS6113416B2 (en) 1986-04-14

Family

ID=15708063

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16011080A Granted JPS5784633A (en) 1980-11-15 1980-11-15 Echo eraser

Country Status (1)

Country Link
JP (1) JPS5784633A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58150336A (en) * 1982-03-02 1983-09-07 Nec Corp Echo canceler
JPS5980031A (en) * 1982-10-30 1984-05-09 Fujitsu Ltd Control system of echo canceller
JPS605634A (en) * 1983-06-24 1985-01-12 Nec Corp Echo canceller

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100389309C (en) * 2005-06-30 2008-05-21 长沙三德实业有限公司 Bilayer type peripherical isothermal temperature setting calorimeter

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58150336A (en) * 1982-03-02 1983-09-07 Nec Corp Echo canceler
JPH0117613B2 (en) * 1982-03-02 1989-03-31 Nippon Electric Co
JPS5980031A (en) * 1982-10-30 1984-05-09 Fujitsu Ltd Control system of echo canceller
JPS605634A (en) * 1983-06-24 1985-01-12 Nec Corp Echo canceller
JPS6343015B2 (en) * 1983-06-24 1988-08-26 Nippon Electric Co

Also Published As

Publication number Publication date
JPS6113416B2 (en) 1986-04-14

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