JPS5760745A - Discrimination method for transmission state of split phase type digital signal - Google Patents

Discrimination method for transmission state of split phase type digital signal

Info

Publication number
JPS5760745A
JPS5760745A JP55135383A JP13538380A JPS5760745A JP S5760745 A JPS5760745 A JP S5760745A JP 55135383 A JP55135383 A JP 55135383A JP 13538380 A JP13538380 A JP 13538380A JP S5760745 A JPS5760745 A JP S5760745A
Authority
JP
Japan
Prior art keywords
circuit
signal
transmission state
output
digital 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
JP55135383A
Other languages
Japanese (ja)
Other versions
JPS5946140B2 (en
Inventor
Takeshi Hattori
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 JP55135383A priority Critical patent/JPS5946140B2/en
Publication of JPS5760745A publication Critical patent/JPS5760745A/en
Publication of JPS5946140B2 publication Critical patent/JPS5946140B2/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/38—Synchronous or start-stop systems, e.g. for Baudot code
    • H04L25/40—Transmitting circuits; Receiving circuits
    • H04L25/49—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems
    • H04L25/4904—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems using self-synchronising codes, e.g. split-phase codes

Landscapes

  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)
  • Dc Digital Transmission (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Manipulation Of Pulses (AREA)

Abstract

PURPOSE:To detect the transmission state of a signal accurately, by shaping the waveform of the demodulation output of a receiver and by counting the number of times, when the time of H and/or L states of the output is equal to a prescribed time, for a prescribed time and by discriminating the transmission state of the signal on a basis of the count value. CONSTITUTION:The digital signal modulated by the modulation system such as a frequency shift system is demodulated by a receiver 1 and is inputted to a comparing circuit 3 through an LPF2 and has the waveform shaped by the circuit 3 and is supplied to one input of an AND gate 4. A clock of a speed several or more times as high as the transmission speed of the signal from a high-speed clock generating circuit 5 is inputted to the other input of the gate 4. By a control circuit 7, a counter 6 is started when the output of the circuit 3 rises, and the counting is stopped when the output of the circuit falls. Then, the number of times when the time of H and/or L states of the shaped output is equal to about 1/2T (T is the clock period of the signal) is counted for a prescribed time by the counter 6; and when the count value exceeds a prescribed value, the transmission state of the signal is discriminated by the circuit 7.
JP55135383A 1980-09-27 1980-09-27 Method for determining the transmission status of split-phase digital signals Expired JPS5946140B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55135383A JPS5946140B2 (en) 1980-09-27 1980-09-27 Method for determining the transmission status of split-phase digital signals

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55135383A JPS5946140B2 (en) 1980-09-27 1980-09-27 Method for determining the transmission status of split-phase digital signals

Publications (2)

Publication Number Publication Date
JPS5760745A true JPS5760745A (en) 1982-04-12
JPS5946140B2 JPS5946140B2 (en) 1984-11-10

Family

ID=15150417

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55135383A Expired JPS5946140B2 (en) 1980-09-27 1980-09-27 Method for determining the transmission status of split-phase digital signals

Country Status (1)

Country Link
JP (1) JPS5946140B2 (en)

Also Published As

Publication number Publication date
JPS5946140B2 (en) 1984-11-10

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