JPS56119579A - Digital type vertical synchronizing circuit - Google Patents

Digital type vertical synchronizing circuit

Info

Publication number
JPS56119579A
JPS56119579A JP2261080A JP2261080A JPS56119579A JP S56119579 A JPS56119579 A JP S56119579A JP 2261080 A JP2261080 A JP 2261080A JP 2261080 A JP2261080 A JP 2261080A JP S56119579 A JPS56119579 A JP S56119579A
Authority
JP
Japan
Prior art keywords
counter
output
changed
variable
average value
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
JP2261080A
Other languages
Japanese (ja)
Other versions
JPH027224B2 (en
Inventor
Shoji Omori
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.)
Sony Corp
Original Assignee
Sony Corp
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 Sony Corp filed Critical Sony Corp
Priority to JP2261080A priority Critical patent/JPS56119579A/en
Publication of JPS56119579A publication Critical patent/JPS56119579A/en
Publication of JPH027224B2 publication Critical patent/JPH027224B2/ja
Granted 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
    • H04N5/12—Devices in which the synchronising signals are only operative if a phase difference occurs between synchronising and synchronised scanning devices, e.g. flywheel synchronising

Abstract

PURPOSE:To reduce jitter in an output pulse of a variable counter to prevent pairing, by controlling the variable counter by the averaged value of detected outputs two continuous fields. CONSTITUTION:Plural counters A-E are provided, and counters C and D are used as fixed counters, and counter A is used as a variable counter. Output PB of counter B is constituted by latch circuit 20A and average value circuit 20B, and average value output PP of detection output PB of two continuous fields obtained by counter B is preset to counter A to change the frequency division ratio. When the frequency division ratio is changed, the time to zero count of variable counter A is changed, and therefore, contents of detection output PB of counter C are changed, and average value output PP is changed. By controlling counter A by this output PP, jitter in the output pulse of counter A to prevent pairing.
JP2261080A 1980-02-25 1980-02-25 Digital type vertical synchronizing circuit Granted JPS56119579A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2261080A JPS56119579A (en) 1980-02-25 1980-02-25 Digital type vertical synchronizing circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2261080A JPS56119579A (en) 1980-02-25 1980-02-25 Digital type vertical synchronizing circuit

Publications (2)

Publication Number Publication Date
JPS56119579A true JPS56119579A (en) 1981-09-19
JPH027224B2 JPH027224B2 (en) 1990-02-16

Family

ID=12087601

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2261080A Granted JPS56119579A (en) 1980-02-25 1980-02-25 Digital type vertical synchronizing circuit

Country Status (1)

Country Link
JP (1) JPS56119579A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5294987A (en) * 1992-07-10 1994-03-15 Thomson Consumer Electronics, Inc. Field to field vertical panning system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5294987A (en) * 1992-07-10 1994-03-15 Thomson Consumer Electronics, Inc. Field to field vertical panning system

Also Published As

Publication number Publication date
JPH027224B2 (en) 1990-02-16

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