JPS5566161A - Two-wire system full double digital transmission device - Google Patents

Two-wire system full double digital transmission device

Info

Publication number
JPS5566161A
JPS5566161A JP13957978A JP13957978A JPS5566161A JP S5566161 A JPS5566161 A JP S5566161A JP 13957978 A JP13957978 A JP 13957978A JP 13957978 A JP13957978 A JP 13957978A JP S5566161 A JPS5566161 A JP S5566161A
Authority
JP
Japan
Prior art keywords
interference
transmission
elimination
codes
converter
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.)
Pending
Application number
JP13957978A
Other languages
Japanese (ja)
Inventor
Kazuchika Watanabe
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 JP13957978A priority Critical patent/JPS5566161A/en
Publication of JPS5566161A publication Critical patent/JPS5566161A/en
Pending 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)
  • Bidirectional Digital Transmission (AREA)
  • Dc Digital Transmission (AREA)

Abstract

PURPOSE:To secure the automatic elimination of the interference between codes without increasing the pulse repetitive frequency on the transmission line more than the transmission or reception pulse by adding the transversal filter to the transmission device and thus eliminating the interference between the transmission and reception signals. CONSTITUTION:The binary digital signal sent from transmission signal input terminal 1 is multiplexed by A/D converter 2, and this multi-value digital signal is delivered via hybrid circuit 3 to hybrid terminal pair 4 connected to the two-wire system transmission line to be then transmitted to the remote station. At the same time, the signal sent from converter 2 is applied to transversal filter 9 for elimination of the reflected wave and leaked wave. While the digital signal sent from the remote station is applied via circuit 3 to transversal filter 13 for elimination of the interference between codes, and the output of filter 13 is supplied to A/D converter 5 connected to reception signal output terminal pair 6. Furthermore, correlators 11 and 13 controlling filters 9 and 13 are provided to secure the automatic elimination of the interference between the codes.
JP13957978A 1978-11-13 1978-11-13 Two-wire system full double digital transmission device Pending JPS5566161A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13957978A JPS5566161A (en) 1978-11-13 1978-11-13 Two-wire system full double digital transmission device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13957978A JPS5566161A (en) 1978-11-13 1978-11-13 Two-wire system full double digital transmission device

Publications (1)

Publication Number Publication Date
JPS5566161A true JPS5566161A (en) 1980-05-19

Family

ID=15248538

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13957978A Pending JPS5566161A (en) 1978-11-13 1978-11-13 Two-wire system full double digital transmission device

Country Status (1)

Country Link
JP (1) JPS5566161A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60223257A (en) * 1985-03-13 1985-11-07 Hitachi Ltd Variable equalizer

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5267909A (en) * 1975-11-28 1977-06-06 Western Electric Co Echo cancelling unit

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5267909A (en) * 1975-11-28 1977-06-06 Western Electric Co Echo cancelling unit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60223257A (en) * 1985-03-13 1985-11-07 Hitachi Ltd Variable equalizer

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