JPS5656056A - Automatic frequency control circuit - Google Patents

Automatic frequency control circuit

Info

Publication number
JPS5656056A
JPS5656056A JP13150379A JP13150379A JPS5656056A JP S5656056 A JPS5656056 A JP S5656056A JP 13150379 A JP13150379 A JP 13150379A JP 13150379 A JP13150379 A JP 13150379A JP S5656056 A JPS5656056 A JP S5656056A
Authority
JP
Japan
Prior art keywords
oscillator
signal
frequency
oscillation frequency
control circuit
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
JP13150379A
Other languages
Japanese (ja)
Other versions
JPS6213846B2 (en
Inventor
Toshihiro Okiyama
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP13150379A priority Critical patent/JPS5656056A/en
Publication of JPS5656056A publication Critical patent/JPS5656056A/en
Publication of JPS6213846B2 publication Critical patent/JPS6213846B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00—Arrangements for synchronising receiver with transmitter
    • H04L7/0079—Receiver details
    • H04L7/0083—Receiver details taking measures against momentary loss of synchronisation, e.g. inhibiting the synchronisation, using idle words or using redundant clocks

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)

Abstract

PURPOSE:To perform waiting communication effectively by measuring and storing a voltage control oscillation frequency in a normal period, by measuing and storing an oscillation frequency fluctuating from the time of the stop of an input signal and then by controlling an oscillator with a signal voltage that corresponds to the difference between both frequencies. CONSTITUTION:The oscillation frequency of voltage control oscillator 2 used as a local oscillator is measured by counter 5. Its output is changed over by switching circuit SW2 according to the existence of input signal VS and led to memory 6 or 7. Each output is subtracted 8 and the frequency of oscillator 2 is controlled with the obtained difference signal. Consequently, when signal VS is intermitted, the frequency of oscillator 2 is controlled by this loop circuit, so that the waiting communication can be performed effectively.
JP13150379A 1979-10-11 1979-10-11 Automatic frequency control circuit Granted JPS5656056A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13150379A JPS5656056A (en) 1979-10-11 1979-10-11 Automatic frequency control circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13150379A JPS5656056A (en) 1979-10-11 1979-10-11 Automatic frequency control circuit

Publications (2)

Publication Number Publication Date
JPS5656056A true JPS5656056A (en) 1981-05-16
JPS6213846B2 JPS6213846B2 (en) 1987-03-30

Family

ID=15059534

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13150379A Granted JPS5656056A (en) 1979-10-11 1979-10-11 Automatic frequency control circuit

Country Status (1)

Country Link
JP (1) JPS5656056A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63158859U (en) * 1987-04-03 1988-10-18

Also Published As

Publication number Publication date
JPS6213846B2 (en) 1987-03-30

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