JPS55159673A - Vertical synchronizing circuit - Google Patents

Vertical synchronizing circuit

Info

Publication number
JPS55159673A
JPS55159673A JP6801779A JP6801779A JPS55159673A JP S55159673 A JPS55159673 A JP S55159673A JP 6801779 A JP6801779 A JP 6801779A JP 6801779 A JP6801779 A JP 6801779A JP S55159673 A JPS55159673 A JP S55159673A
Authority
JP
Japan
Prior art keywords
signal
vertical synchronizing
pulse width
vertical
circuit
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
JP6801779A
Other languages
Japanese (ja)
Other versions
JPS612343B2 (en
Inventor
Yukinori Kudo
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP6801779A priority Critical patent/JPS55159673A/en
Publication of JPS55159673A publication Critical patent/JPS55159673A/en
Publication of JPS612343B2 publication Critical patent/JPS612343B2/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
    • H04N5/08—Separation of synchronising signals from picture signals
    • H04N5/10—Separation of line synchronising signal from frame synchronising signal or vice versa

Landscapes

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

Abstract

PURPOSE:To make easy the integration and to make unnecessary the adjustment of vertical oscillator at all, by making pulse signal through separation and picking up of the composite vertical synchronizing signal in composite video signals and digitizing all the vertical synchronizing circuits. CONSTITUTION:The pulse width picking up the composite synchronizing signal in the composite video signals is extended at the pulse width extension circuit 13, and the signal of a given pulse width is detected from the signal in pulse width extension with the pulse width detection circuit 14. The preiod of the specified width detection signal detected by the circuit 14 is detected at a given clock and the continuity is detected, and when specified conditions are satisfied, the vertical synchronizing detection signal is output from the continuity detection circuit 18. Further, the clock is counted for one vertical period at the vertical counter 20, and the phase between the timing signal produced at a given phase of the counter 20 and the detection signal from the circuit 18 is compared at the mode detection circuits 26,27 to judge the vertical synchronizing mode. Further, when the vertical synchronizing signal is not obtained for a given period, the operating mode of the circuits 13,14 is simultaneously switched.
JP6801779A 1979-05-31 1979-05-31 Vertical synchronizing circuit Granted JPS55159673A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6801779A JPS55159673A (en) 1979-05-31 1979-05-31 Vertical synchronizing circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6801779A JPS55159673A (en) 1979-05-31 1979-05-31 Vertical synchronizing circuit

Publications (2)

Publication Number Publication Date
JPS55159673A true JPS55159673A (en) 1980-12-11
JPS612343B2 JPS612343B2 (en) 1986-01-24

Family

ID=13361629

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6801779A Granted JPS55159673A (en) 1979-05-31 1979-05-31 Vertical synchronizing circuit

Country Status (1)

Country Link
JP (1) JPS55159673A (en)

Also Published As

Publication number Publication date
JPS612343B2 (en) 1986-01-24

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