JPS572168A - Generating system of synchronous signal - Google Patents

Generating system of synchronous signal

Info

Publication number
JPS572168A
JPS572168A JP7421980A JP7421980A JPS572168A JP S572168 A JPS572168 A JP S572168A JP 7421980 A JP7421980 A JP 7421980A JP 7421980 A JP7421980 A JP 7421980A JP S572168 A JPS572168 A JP S572168A
Authority
JP
Japan
Prior art keywords
signal
counter
output
frequency
subcarrier
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
JP7421980A
Other languages
Japanese (ja)
Inventor
Naoki Miyauchi
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.)
Hitachi Denshi KK
Original Assignee
Hitachi Denshi KK
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 Hitachi Denshi KK filed Critical Hitachi Denshi KK
Priority to JP7421980A priority Critical patent/JPS572168A/en
Publication of JPS572168A publication Critical patent/JPS572168A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/04—Synchronising
    • H04N5/06—Generation of synchronising signals

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Synchronizing For Television (AREA)

Abstract

PURPOSE:To always secure a constant phase relation between a subcarrier and a horizontal synchronous signal and ensure a stable extraction of a color frame signal, by adding a simple circuit consisting of a counter and a switching circuit. CONSTITUTION:In case no input VBS signal exists, a switching circuit 12 is controlled by the output of an input detecting circuit 8. The output of a 1/455 counter 13 is applied to a synchronous signal generator 11 through the circuit 12 to set a 1/910 counter inside the generator 11. Thus the phase relation is made constant between the horizontal synchronous signal of the generator 11 and the output signal of the counter 13. At the same time, the frequency signal of a 4fsc oscillator 4 is divided by 1/2 counters 5 and 6 to be turned into a subcarrier SC of frequency fsc. The 2fsc frequency signal of the output of the counter 5 is divided down to 1/455 by the counter 13 to be turned into a signal of horizontal synchronous frequency H, and a constant relation is always secured for this signal with the subcarrier SC of the counter 6. Then a stable synchronous coupling is carried out when the input VBS exists to ensure a stable extraction of a color frame signal.
JP7421980A 1980-06-04 1980-06-04 Generating system of synchronous signal Pending JPS572168A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7421980A JPS572168A (en) 1980-06-04 1980-06-04 Generating system of synchronous signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7421980A JPS572168A (en) 1980-06-04 1980-06-04 Generating system of synchronous signal

Publications (1)

Publication Number Publication Date
JPS572168A true JPS572168A (en) 1982-01-07

Family

ID=13540852

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7421980A Pending JPS572168A (en) 1980-06-04 1980-06-04 Generating system of synchronous signal

Country Status (1)

Country Link
JP (1) JPS572168A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60132314A (en) * 1983-12-20 1985-07-15 ニチコン株式会社 Chip type electrolytic condenser
JPS62105413A (en) * 1985-11-01 1987-05-15 株式会社村田製作所 Electric double-layer capacitor
JPH01102914A (en) * 1987-10-15 1989-04-20 Nec Corp Carbon paste electrode

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60132314A (en) * 1983-12-20 1985-07-15 ニチコン株式会社 Chip type electrolytic condenser
JPS62105413A (en) * 1985-11-01 1987-05-15 株式会社村田製作所 Electric double-layer capacitor
JPH01102914A (en) * 1987-10-15 1989-04-20 Nec Corp Carbon paste electrode
JPH0552049B2 (en) * 1987-10-15 1993-08-04 Nippon Electric Co

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