JPS56158535A - Automatic frequency controller - Google Patents

Automatic frequency controller

Info

Publication number
JPS56158535A
JPS56158535A JP6250780A JP6250780A JPS56158535A JP S56158535 A JPS56158535 A JP S56158535A JP 6250780 A JP6250780 A JP 6250780A JP 6250780 A JP6250780 A JP 6250780A JP S56158535 A JPS56158535 A JP S56158535A
Authority
JP
Japan
Prior art keywords
frequency
error
oscillator
counter
control
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
JP6250780A
Other languages
Japanese (ja)
Inventor
Yasuhito Isoe
Kazuo Yano
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 JP6250780A priority Critical patent/JPS56158535A/en
Publication of JPS56158535A publication Critical patent/JPS56158535A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L7/00—Automatic control of frequency or phase; Synchronisation
    • H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
    • H03L7/08—Details of the phase-locked loop
    • H03L7/10—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range
    • H03L7/113—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range using frequency discriminator

Landscapes

  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
  • Radio Relay Systems (AREA)

Abstract

PURPOSE:To reduce the drawing time, by switching the frequency control of a voltage controlled oscillator from an exponential function control to a primary functional control, when an input signal goes to a given frequency error. CONSTITUTION:The frequency error between an input signal frequency and the reference frequency from an oscillator 2 is outputted from a frequency discriminator 1 and frequency-divided at 3 and inputted to a control circuit 5, and the high/low information of error is inputted to a reversible counter 4. When the frequency error is greater, a switch 10 inputs the output of the frequency divider 3 to the counter 4, which controls a voltage control oscillator 7 with the signal having D/A- converted at 6 the value obtained by performing up-or down-count according to the amplitude of the error, and the signal from an oscillator 7 is inputted to the discriminator 1 via a feedback 8. When the error reaches a given value, the circuit 5 detects it and switches the switch 10 to a pulse generator 9. The generator 9 produces the pulse of a given period, operates the counter 4 toward error decrease, and the output frequency of the oscillator 7 is changed in primary-functionally. When the error reaches a given value, the circuit 5 stops the operation of the counter 4.
JP6250780A 1980-05-12 1980-05-12 Automatic frequency controller Pending JPS56158535A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6250780A JPS56158535A (en) 1980-05-12 1980-05-12 Automatic frequency controller

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6250780A JPS56158535A (en) 1980-05-12 1980-05-12 Automatic frequency controller

Publications (1)

Publication Number Publication Date
JPS56158535A true JPS56158535A (en) 1981-12-07

Family

ID=13202150

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6250780A Pending JPS56158535A (en) 1980-05-12 1980-05-12 Automatic frequency controller

Country Status (1)

Country Link
JP (1) JPS56158535A (en)

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