JPS57160275A - Vertical synchronizing device - Google Patents

Vertical synchronizing device

Info

Publication number
JPS57160275A
JPS57160275A JP4600881A JP4600881A JPS57160275A JP S57160275 A JPS57160275 A JP S57160275A JP 4600881 A JP4600881 A JP 4600881A JP 4600881 A JP4600881 A JP 4600881A JP S57160275 A JPS57160275 A JP S57160275A
Authority
JP
Japan
Prior art keywords
circuit
pulse
vertical
vsync
frequency
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
JP4600881A
Other languages
Japanese (ja)
Other versions
JPS6137824B2 (en
Inventor
Yuichi Shiotani
Namio Yamaguchi
Sukeyuki Sato
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP4600881A priority Critical patent/JPS57160275A/en
Publication of JPS57160275A publication Critical patent/JPS57160275A/en
Publication of JPS6137824B2 publication Critical patent/JPS6137824B2/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 assure the merit of application of the vetical synchronizing pulse to maximum, by examining whether a prescribed relation exists between the horizontal and vertical synchronizing pulses to detect the missing of the vertical synchronising pulse and as a result delivering the divided pulse even in case the vertical pulse is missing. CONSTITUTION:The vertical synchronizing pulse Vsync plus 2fH of an integer place of the horizontal synchronizing pulse Hsync are supplied to a discriminat- ing circuit 1 for vertical synchronizing pulse frequency. A circuit which generates the horizontal frequency and its integer-fold frequency synchronizing with pulses Hsync and Vsync that control a vertical output circuit 5 plus a circuit that divides the output signal of the first-mentioned circuit with a prescribed dividing ratio are installed to the circuit 1. The outputs of these circuits are applied to an automatic-direct synchronization switching circuit 2. Furthermore a frequency dividing circuit 3 that oscillates a frequency synchronous with the pulse Vsync and a vertical oscillating circuit 4 are installed, and the circuit 2 is controlled with the outputs of the circuits 3 and 4. Then the relation is checked between the pulses Vsync=Hsync, and the divided pulse is delivered also in case the pulse Vsync is missing.
JP4600881A 1981-03-27 1981-03-27 Vertical synchronizing device Granted JPS57160275A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4600881A JPS57160275A (en) 1981-03-27 1981-03-27 Vertical synchronizing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4600881A JPS57160275A (en) 1981-03-27 1981-03-27 Vertical synchronizing device

Publications (2)

Publication Number Publication Date
JPS57160275A true JPS57160275A (en) 1982-10-02
JPS6137824B2 JPS6137824B2 (en) 1986-08-26

Family

ID=12735031

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4600881A Granted JPS57160275A (en) 1981-03-27 1981-03-27 Vertical synchronizing device

Country Status (1)

Country Link
JP (1) JPS57160275A (en)

Also Published As

Publication number Publication date
JPS6137824B2 (en) 1986-08-26

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