JPS57148432A - Frequency synchronization system - Google Patents

Frequency synchronization system

Info

Publication number
JPS57148432A
JPS57148432A JP56033639A JP3363981A JPS57148432A JP S57148432 A JPS57148432 A JP S57148432A JP 56033639 A JP56033639 A JP 56033639A JP 3363981 A JP3363981 A JP 3363981A JP S57148432 A JPS57148432 A JP S57148432A
Authority
JP
Japan
Prior art keywords
time
outputs
counters
transmitters
timer
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
JP56033639A
Other languages
Japanese (ja)
Other versions
JPS6232653B2 (en
Inventor
Moriji Hata
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 JP56033639A priority Critical patent/JPS57148432A/en
Publication of JPS57148432A publication Critical patent/JPS57148432A/en
Publication of JPS6232653B2 publication Critical patent/JPS6232653B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/18—Arrangements for synchronising broadcast or distribution via plural systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/01—Reducing phase shift
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/65—Arrangements characterised by transmission systems for broadcast
    • H04H20/67—Common-wave systems, i.e. using separate transmitters operating on substantially the same frequency
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/65—Arrangements characterised by transmission systems for broadcast
    • H04H20/76—Wired systems
    • H04H20/82—Wired systems using signals not modulated onto a carrier
    • H04H20/83—Wired systems using signals not modulated onto a carrier not sharing the network with any other service

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)
  • Radio Transmission System (AREA)

Abstract

PURPOSE:To equalize mutual transmission frequencies to each other accurately at low cost by dividing the carrier frequency of every channel by time at constant intervals of time and sending it from a master station, and then controlling a transmission frequency on the basis of the received signal at a subordinate station. CONSTITUTION:At a master station 1, signals with carrier frequencies fT1-fTn of transmitters 21-2n for respective channels are led to counters 121-12n, whose outputs are processed by parallel-series conversion by converters 131-13n, whose outputs are synthesized 5 and sent to a subordinate station 6 through a communication circuit 7. Further, a signal fO from a pilot oscillator 15 is sent to the circuit 7 and a timer 16 to operate the counters at constant intervals of time on time-division basis by the output of the timer 16. At a subordinate station 6, the signal fO is extracted through a BPF17 and led to a timer 16', thereby counting the outputs f'T1-f'Tn of transmitters 2'1-2'n by counters 12'1-12'n for the same time with the master station. The count outputs are compared by comparators 191-19n with signals obtained by converting the sent digital signals by series-parallel converters 13'1-13'n, thereby controlling the transmission frequencies of the transmitters 2'1-2'n by comparison outputs.
JP56033639A 1981-03-09 1981-03-09 Frequency synchronization system Granted JPS57148432A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56033639A JPS57148432A (en) 1981-03-09 1981-03-09 Frequency synchronization system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56033639A JPS57148432A (en) 1981-03-09 1981-03-09 Frequency synchronization system

Publications (2)

Publication Number Publication Date
JPS57148432A true JPS57148432A (en) 1982-09-13
JPS6232653B2 JPS6232653B2 (en) 1987-07-16

Family

ID=12392014

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56033639A Granted JPS57148432A (en) 1981-03-09 1981-03-09 Frequency synchronization system

Country Status (1)

Country Link
JP (1) JPS57148432A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0138366A2 (en) * 1983-09-07 1985-04-24 BRITISH TELECOMMUNICATIONS public limited company Frequency control for point-to-multipoint radio

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0138366A2 (en) * 1983-09-07 1985-04-24 BRITISH TELECOMMUNICATIONS public limited company Frequency control for point-to-multipoint radio
US4670889A (en) * 1983-09-07 1987-06-02 British Telecommunications Plc Frequency control for point to multipoint radio

Also Published As

Publication number Publication date
JPS6232653B2 (en) 1987-07-16

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