JPS56104556A - Digital transmission system - Google Patents

Digital transmission system

Info

Publication number
JPS56104556A
JPS56104556A JP721880A JP721880A JPS56104556A JP S56104556 A JPS56104556 A JP S56104556A JP 721880 A JP721880 A JP 721880A JP 721880 A JP721880 A JP 721880A JP S56104556 A JPS56104556 A JP S56104556A
Authority
JP
Japan
Prior art keywords
transmission
code pattern
control circuit
pattern
transmitter
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
JP721880A
Other languages
Japanese (ja)
Inventor
Hiroshi Suzuki
Kazuaki Murota
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 JP721880A priority Critical patent/JPS56104556A/en
Publication of JPS56104556A publication Critical patent/JPS56104556A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)

Abstract

PURPOSE:To compensate distortion for all code patterns, by detecting occurrence of a specific code pattern and by starting the control circuit by this detection output to change transmission parameters in the direction where the demodulation characteristic is improved. CONSTITUTION:Input data from terminal 11 is transmitted to transmission line 13 through transmitter 12 including the modulator. In the receiving side, the signal received from the transmission line is demodulated by demodulator 14 and is transmitted to output terminal 15. In case of transmission of (n) kinds of code pattern S1-Sk-Sn in this transmission system, when code pattern Sk having a large transmission distortion specially is input, this pattern is detected by detecting circuit 16. By this detection output, control circuit 17 is started. Transmission parameters of transmitter 12 are changed in the direction, where the demodulation characteristic is improved, by the operation of this control circuit 17, and changed transmission parameters are returned to original those after transmission of code pattern Sk.
JP721880A 1980-01-23 1980-01-23 Digital transmission system Pending JPS56104556A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP721880A JPS56104556A (en) 1980-01-23 1980-01-23 Digital transmission system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP721880A JPS56104556A (en) 1980-01-23 1980-01-23 Digital transmission system

Publications (1)

Publication Number Publication Date
JPS56104556A true JPS56104556A (en) 1981-08-20

Family

ID=11659851

Family Applications (1)

Application Number Title Priority Date Filing Date
JP721880A Pending JPS56104556A (en) 1980-01-23 1980-01-23 Digital transmission system

Country Status (1)

Country Link
JP (1) JPS56104556A (en)

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