JPS57132444A - Carrier frequency controlling system for slave station applied to multidirection multiplex communication system - Google Patents

Carrier frequency controlling system for slave station applied to multidirection multiplex communication system

Info

Publication number
JPS57132444A
JPS57132444A JP1688881A JP1688881A JPS57132444A JP S57132444 A JPS57132444 A JP S57132444A JP 1688881 A JP1688881 A JP 1688881A JP 1688881 A JP1688881 A JP 1688881A JP S57132444 A JPS57132444 A JP S57132444A
Authority
JP
Japan
Prior art keywords
slave station
carrier wave
oscillator
carrier frequency
multiplex communication
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
JP1688881A
Other languages
Japanese (ja)
Inventor
Saburo Niina
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co Ltd
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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP1688881A priority Critical patent/JPS57132444A/en
Publication of JPS57132444A publication Critical patent/JPS57132444A/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
    • H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
    • H04L27/22—Demodulator circuits; Receiver circuits
    • H04L27/227—Demodulator circuits; Receiver circuits using coherent demodulation
    • H04L27/2271—Demodulator circuits; Receiver circuits using coherent demodulation wherein the carrier recovery circuit uses only the demodulated signals

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Time-Division Multiplex Systems (AREA)

Abstract

PURPOSE:To sufficiently suppress shift of frequencies of each slave station, by reproducing carrier waves in signals from a master station received commonly with each slave station and synchronizing a transmission frequency to the carrier frequency. CONSTITUTION:A communication device of a slave station is provided with a phase synchronizing circuit consisting of a voltage controlled oscillator 24, phase comparator 25, and loop filter 26, in place of a carrier wave oscillator. Further, a demodulator 19' picks up a carrier wave (p) reproduced from a reproducing circuit of carrier wave and gives it to the phase comparator 25. The carrier wave (p) obtained from it is given to the comparator together with an output (j) of the oscillator 24 to synchronize the oscillator 24 via the filter 26.
JP1688881A 1981-02-09 1981-02-09 Carrier frequency controlling system for slave station applied to multidirection multiplex communication system Pending JPS57132444A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1688881A JPS57132444A (en) 1981-02-09 1981-02-09 Carrier frequency controlling system for slave station applied to multidirection multiplex communication system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1688881A JPS57132444A (en) 1981-02-09 1981-02-09 Carrier frequency controlling system for slave station applied to multidirection multiplex communication system

Publications (1)

Publication Number Publication Date
JPS57132444A true JPS57132444A (en) 1982-08-16

Family

ID=11928699

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1688881A Pending JPS57132444A (en) 1981-02-09 1981-02-09 Carrier frequency controlling system for slave station applied to multidirection multiplex communication system

Country Status (1)

Country Link
JP (1) JPS57132444A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57210743A (en) * 1981-06-19 1982-12-24 Fujitsu Ltd Tdma synchronizing system
JPS59183543A (en) * 1983-04-01 1984-10-18 Fujitsu Ltd Time division multi-direction communication system
USRE36973E (en) * 1989-10-12 2000-11-28 Seiko Epson Corporation Digitally-corrected temperature-compensated crystal oscillator having a correction-suspend control for communications service

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54158810A (en) * 1978-06-06 1979-12-15 Nec Corp Time-division multidirectional multiplex communication system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54158810A (en) * 1978-06-06 1979-12-15 Nec Corp Time-division multidirectional multiplex communication system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57210743A (en) * 1981-06-19 1982-12-24 Fujitsu Ltd Tdma synchronizing system
JPS59183543A (en) * 1983-04-01 1984-10-18 Fujitsu Ltd Time division multi-direction communication system
USRE36973E (en) * 1989-10-12 2000-11-28 Seiko Epson Corporation Digitally-corrected temperature-compensated crystal oscillator having a correction-suspend control for communications service

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