JPS57157690A - Synchronous signal generator - Google Patents

Synchronous signal generator

Info

Publication number
JPS57157690A
JPS57157690A JP4250781A JP4250781A JPS57157690A JP S57157690 A JPS57157690 A JP S57157690A JP 4250781 A JP4250781 A JP 4250781A JP 4250781 A JP4250781 A JP 4250781A JP S57157690 A JPS57157690 A JP S57157690A
Authority
JP
Japan
Prior art keywords
synchronous signal
scanning
signal
counting
vertical synchronous
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
JP4250781A
Other languages
Japanese (ja)
Inventor
Katsutoshi Kato
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 Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP4250781A priority Critical patent/JPS57157690A/en
Publication of JPS57157690A publication Critical patent/JPS57157690A/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
    • H04N5/067—Arrangements or circuits at the transmitter end

Landscapes

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

Abstract

PURPOSE:To switch both to jumping scanning and sequenctial scanning in the entitled generator with a simple configuration by supplying a pulse generated from a vertical synchronous signal to a counter if necessary to generate miss counting in appearance. CONSTITUTION:A vertical synchronous signal generator 4 consists of a one-shot multiplexer 18, a resistance 19 and a capacitor 20 which constitute a differentiation circuit, a NAND gate 21 switching jumping scanning and sequential scanning, an input terminal 22 for a clock pulse 2fh with frequency (31.5kHz) twice that of a horizontal synchronous signal, an OR gate 23, a 1/3 divider 24, a 1/175 divider 25, and an output terminal 26 for a vertical synchronous signal VD. In a circuit to obtain the signal VD by counting 525 a clock pulse 2fh, a pulse generated from the signal VD is supplied to the counter in every field period to generate a kind of miss counting, switching jumping scanning and sequential scanning automatically and simply.
JP4250781A 1981-03-25 1981-03-25 Synchronous signal generator Pending JPS57157690A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4250781A JPS57157690A (en) 1981-03-25 1981-03-25 Synchronous signal generator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4250781A JPS57157690A (en) 1981-03-25 1981-03-25 Synchronous signal generator

Publications (1)

Publication Number Publication Date
JPS57157690A true JPS57157690A (en) 1982-09-29

Family

ID=12637973

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4250781A Pending JPS57157690A (en) 1981-03-25 1981-03-25 Synchronous signal generator

Country Status (1)

Country Link
JP (1) JPS57157690A (en)

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