JPS5510243A - Data communication unit - Google Patents

Data communication unit

Info

Publication number
JPS5510243A
JPS5510243A JP8288078A JP8288078A JPS5510243A JP S5510243 A JPS5510243 A JP S5510243A JP 8288078 A JP8288078 A JP 8288078A JP 8288078 A JP8288078 A JP 8288078A JP S5510243 A JPS5510243 A JP S5510243A
Authority
JP
Japan
Prior art keywords
turn
component
transmitted
receiver circuit
signal
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
JP8288078A
Other languages
Japanese (ja)
Other versions
JPS5829023B2 (en
Inventor
Ryoichi Sugioka
Kensaku Fujii
Masaharu Terauchi
Toshiharu Takami
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.)
Fujitsu Ltd
Nippon Telegraph and Telephone Corp
Original Assignee
Fujitsu Ltd
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 Fujitsu Ltd, Nippon Telegraph and Telephone Corp filed Critical Fujitsu Ltd
Priority to JP8288078A priority Critical patent/JPS5829023B2/en
Publication of JPS5510243A publication Critical patent/JPS5510243A/en
Publication of JPS5829023B2 publication Critical patent/JPS5829023B2/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
    • H04B3/231—Echo cancellers using readout of a memory to provide the echo replica

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Bidirectional Digital Transmission (AREA)
  • Dc Digital Transmission (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

PURPOSE:To carry out echo cancellation accurately by storing the turn-around component of a transmitted signal waveform and by subtracting it from a received signal. CONSTITUTION:To remove the turn-around component of a transmitted signal of a digital information transmission to the reception side, the component that the transmitted signal used for the transmission of transmitted digital information from transmitter circuit 1 has turned around to receiver circuit 4 via hybrid circuit 2 is stored in echo memory 71 by switching change-over switch 43. Then, the turn- around component of a transmitted signal equivalent to digital information transmitted to receiver circuit 4 is read out from the turn-around component of the transmission signal stored in memory 71 to receiver circuit 4 via read change-over switch 72 and then supplied to subtracter 9. Subtracter 9 subtracts the turn-aroud component read out from the signal received by receiver circuit 4 to attain echo cancellation accurately.
JP8288078A 1978-07-10 1978-07-10 data communication equipment Expired JPS5829023B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8288078A JPS5829023B2 (en) 1978-07-10 1978-07-10 data communication equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8288078A JPS5829023B2 (en) 1978-07-10 1978-07-10 data communication equipment

Publications (2)

Publication Number Publication Date
JPS5510243A true JPS5510243A (en) 1980-01-24
JPS5829023B2 JPS5829023B2 (en) 1983-06-20

Family

ID=13786582

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8288078A Expired JPS5829023B2 (en) 1978-07-10 1978-07-10 data communication equipment

Country Status (1)

Country Link
JP (1) JPS5829023B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5781732A (en) * 1980-09-09 1982-05-21 Northern Telecom Ltd Method and device for detecting echo in voice channel signal
EP0063638A2 (en) * 1981-04-28 1982-11-03 Siemens Aktiengesellschaft Digital telecommunication system
EP0066006A2 (en) * 1981-05-29 1982-12-08 Siemens Aktiengesellschaft Arrangement for compensating crosstalk and/or echoes

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5781732A (en) * 1980-09-09 1982-05-21 Northern Telecom Ltd Method and device for detecting echo in voice channel signal
EP0063638A2 (en) * 1981-04-28 1982-11-03 Siemens Aktiengesellschaft Digital telecommunication system
DE3116863A1 (en) * 1981-04-28 1982-11-11 Siemens AG, 1000 Berlin und 8000 München DIGITAL TELECOMMUNICATION SYSTEM
DE3116863C2 (en) * 1981-04-28 1985-08-08 Siemens AG, 1000 Berlin und 8000 München Circuit arrangement for digital signal echo cancellation
EP0066006A2 (en) * 1981-05-29 1982-12-08 Siemens Aktiengesellschaft Arrangement for compensating crosstalk and/or echoes

Also Published As

Publication number Publication date
JPS5829023B2 (en) 1983-06-20

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