JPS57162576A - Vertical synchronizing device - Google Patents

Vertical synchronizing device

Info

Publication number
JPS57162576A
JPS57162576A JP4783581A JP4783581A JPS57162576A JP S57162576 A JPS57162576 A JP S57162576A JP 4783581 A JP4783581 A JP 4783581A JP 4783581 A JP4783581 A JP 4783581A JP S57162576 A JPS57162576 A JP S57162576A
Authority
JP
Japan
Prior art keywords
vertical synchronizing
signal
counter
broadcast standard
diagram
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
JP4783581A
Other languages
Japanese (ja)
Other versions
JPS6132870B2 (en
Inventor
Yuichi Shiotani
Namio Yamaguchi
Sukeyuki Sato
Hirosuke Yamamoto
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 JP4783581A priority Critical patent/JPS57162576A/en
Publication of JPS57162576A publication Critical patent/JPS57162576A/en
Publication of JPS6132870B2 publication Critical patent/JPS6132870B2/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

Landscapes

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

Abstract

PURPOSE:To improve stability for the switching between an automatic synchronization and a direct synchronizaton with a vertical synchronizing circuit of a TV picture receiver, by deciding whether the received vertical synchronizing signal is in accordance with the broadcast standard by setting the detecting margine of a counter within a certain range. CONSTITUTION:In case the vertical synchronizing pulse Vsync (Hz) is identical with the signal Vsync =2fH/525 as defined by the broadcast standard, a counter shown in the diagram counts 2625 or 2626 according to the difference of phase. On the other hand, it is very hard to decide whether the vertical synchronizing signal is in accordance with the broadcast standard if the said signal receives the interference of a video wave detection signal. In this connection, a detection margin is secured for a vertical synchronizing pulse deciding circuit as shown in the diagram. In other words, the counter is connected to an NAND circuit N3N4 with each relation as shown in the diagram. As a result, the broadcast standard signal can be decided up to 2625+ or -3 for the detection of the counter. Thus the frequent switching is avoided between the automatic and direct synchronizations to secure the extremely high stability of switching.
JP4783581A 1981-03-30 1981-03-30 Vertical synchronizing device Granted JPS57162576A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4783581A JPS57162576A (en) 1981-03-30 1981-03-30 Vertical synchronizing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4783581A JPS57162576A (en) 1981-03-30 1981-03-30 Vertical synchronizing device

Publications (2)

Publication Number Publication Date
JPS57162576A true JPS57162576A (en) 1982-10-06
JPS6132870B2 JPS6132870B2 (en) 1986-07-30

Family

ID=12786412

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4783581A Granted JPS57162576A (en) 1981-03-30 1981-03-30 Vertical synchronizing device

Country Status (1)

Country Link
JP (1) JPS57162576A (en)

Also Published As

Publication number Publication date
JPS6132870B2 (en) 1986-07-30

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