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JPS5694841A - Pilot signal production system - Google Patents

Pilot signal production system

Info

Publication number
JPS5694841A
JPS5694841A JP17201979A JP17201979A JPS5694841A JP S5694841 A JPS5694841 A JP S5694841A JP 17201979 A JP17201979 A JP 17201979A JP 17201979 A JP17201979 A JP 17201979A JP S5694841 A JPS5694841 A JP S5694841A
Authority
JP
Japan
Prior art keywords
vcxo
synchronism
voltage
oscillation frequency
pilot 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.)
Pending
Application number
JP17201979A
Other languages
Japanese (ja)
Inventor
Yoshio Kanezashi
Hiroshi Ogasawara
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 JP17201979A priority Critical patent/JPS5694841A/en
Publication of JPS5694841A publication Critical patent/JPS5694841A/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

Landscapes

  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)

Abstract

PURPOSE:To prevent the pilot signal from disturbing other signals, by changing the oscillation frequency of VCXO toward a low frequency in case the PLL has an out- of-synchronism. CONSTITUTION:A phase comparison is given through the phase comparator 11 between the output signal of the pulse generator 3 and the division output of the divider 9. The output of the comparison produces the negative control voltage Vc through the pulse amplifier 5 and the loop filter 6. The adverse bias voltage of the variable capacity diode 12 increases by the voltage Vc, and thus the oscillation frequency of VCXO including the diode 12 and quartz oscillator 13 to perform a pull-in of synchronism. The voltage Vc becomes minimum with the out-of-synchronism, and accordingly the oscillation frequency of VCXO always changes toward a low level.
JP17201979A 1979-12-27 1979-12-27 Pilot signal production system Pending JPS5694841A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17201979A JPS5694841A (en) 1979-12-27 1979-12-27 Pilot signal production system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17201979A JPS5694841A (en) 1979-12-27 1979-12-27 Pilot signal production system

Publications (1)

Publication Number Publication Date
JPS5694841A true JPS5694841A (en) 1981-07-31

Family

ID=15934007

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17201979A Pending JPS5694841A (en) 1979-12-27 1979-12-27 Pilot signal production system

Country Status (1)

Country Link
JP (1) JPS5694841A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4631585A (en) * 1984-05-07 1986-12-23 Rca Corporation Apparatus for synchronizing the operation of a microprocessor with a television synchronization signal useful in generating an on-screen character display

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4631585A (en) * 1984-05-07 1986-12-23 Rca Corporation Apparatus for synchronizing the operation of a microprocessor with a television synchronization signal useful in generating an on-screen character display

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