JPS5694841A - Pilot signal production system - Google Patents
Pilot signal production systemInfo
- 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
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
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.
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0161883A2 (en) * | 1984-05-07 | 1985-11-21 | Rca Licensing Corporation | Sychronizing the operation of a computing means with a reference frequency signal |
-
1979
- 1979-12-27 JP JP17201979A patent/JPS5694841A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0161883A2 (en) * | 1984-05-07 | 1985-11-21 | Rca Licensing Corporation | Sychronizing the operation of a computing means with a reference frequency signal |
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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