JPS5566177A - Synchronous isolation device - Google Patents

Synchronous isolation device

Info

Publication number
JPS5566177A
JPS5566177A JP13904278A JP13904278A JPS5566177A JP S5566177 A JPS5566177 A JP S5566177A JP 13904278 A JP13904278 A JP 13904278A JP 13904278 A JP13904278 A JP 13904278A JP S5566177 A JPS5566177 A JP S5566177A
Authority
JP
Japan
Prior art keywords
signal
synchronous
apl
isolation
switching
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
JP13904278A
Other languages
Japanese (ja)
Other versions
JPS5947909B2 (en
Inventor
Akira Suzuki
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 JP53139042A priority Critical patent/JPS5947909B2/en
Publication of JPS5566177A publication Critical patent/JPS5566177A/en
Publication of JPS5947909B2 publication Critical patent/JPS5947909B2/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/14—Picture signal circuitry for video frequency region
    • H04N5/16—Circuitry for reinsertion of dc and slowly varying components of signal; Circuitry for preservation of black or white level

Landscapes

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

Abstract

PURPOSE:To increase the clamp response speed for the synchronous isolation when the switching is given from the signal featuring a high APL (average picture level) to the signal of a low APL by constituting the clamp circuit, which isolates the synchronous signal from the video signal, with the transistor. CONSTITUTION:The isolation device consists of the following component elements: input terminal 11 of the video signal; transistor 12 featuring the switching action; diodes 13 and 16; differential amplifier 14 which carries out the potential comparison for isolation of the synchronous signal based on the potential decided with the DC-clamped video signal and variable resistance 11; retriggerable monostable oscillator 15 of time constant T which is driven by the rise of the synchronous signal; output terminal 17; input terminal 18 for the signal applied to amplifier 14; constant voltage source 19 and others. In such constitution, the clamp response speed can be increased in switching from the high-APL signal to the low-APL signal without increasing the sag, thus ensuring the synchronous isolation with the excellent characteristics.
JP53139042A 1978-11-10 1978-11-10 Synchronous separation device Expired JPS5947909B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP53139042A JPS5947909B2 (en) 1978-11-10 1978-11-10 Synchronous separation device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP53139042A JPS5947909B2 (en) 1978-11-10 1978-11-10 Synchronous separation device

Publications (2)

Publication Number Publication Date
JPS5566177A true JPS5566177A (en) 1980-05-19
JPS5947909B2 JPS5947909B2 (en) 1984-11-22

Family

ID=15236090

Family Applications (1)

Application Number Title Priority Date Filing Date
JP53139042A Expired JPS5947909B2 (en) 1978-11-10 1978-11-10 Synchronous separation device

Country Status (1)

Country Link
JP (1) JPS5947909B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0255274A2 (en) * 1986-07-19 1988-02-03 Sony Corporation Gain control circuits
US5345117A (en) * 1991-09-13 1994-09-06 Nec Corporation Synchronous separating circuit

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5193813A (en) * 1975-02-17 1976-08-17
JPS51132920U (en) * 1975-04-18 1976-10-26

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5193813A (en) * 1975-02-17 1976-08-17
JPS51132920U (en) * 1975-04-18 1976-10-26

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0255274A2 (en) * 1986-07-19 1988-02-03 Sony Corporation Gain control circuits
US5345117A (en) * 1991-09-13 1994-09-06 Nec Corporation Synchronous separating circuit

Also Published As

Publication number Publication date
JPS5947909B2 (en) 1984-11-22

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