JPS57152779A - Synchronous signal clamping circuit for video signal - Google Patents

Synchronous signal clamping circuit for video signal

Info

Publication number
JPS57152779A
JPS57152779A JP56037764A JP3776481A JPS57152779A JP S57152779 A JPS57152779 A JP S57152779A JP 56037764 A JP56037764 A JP 56037764A JP 3776481 A JP3776481 A JP 3776481A JP S57152779 A JPS57152779 A JP S57152779A
Authority
JP
Japan
Prior art keywords
synchronous signal
signal
video signal
synchronous
level
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
JP56037764A
Other languages
Japanese (ja)
Other versions
JPH023586B2 (en
Inventor
Yasunari Arafune
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 JP56037764A priority Critical patent/JPS57152779A/en
Publication of JPS57152779A publication Critical patent/JPS57152779A/en
Publication of JPH023586B2 publication Critical patent/JPH023586B2/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
    • H04N5/14—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
    • H04N5/18—Circuitry for reinsertion of dc and slowly varying components of signal; Circuitry for preservation of black or white level by means of "clamp" circuit operated by switching circuit

Abstract

PURPOSE:To uniform the head levels of synchronous signals at charging by reducing power supply current to an output circuit by the amount of the charging current of a clamping capacitor which is required at the arrival of a synchronous signal in a video signal. CONSTITUTION:In the entitled synchronous signal clamping circuit for a video signal, the video signal is inputted through a clamping capacitor C and, during the arrival of the head level of its synchronous signal, electric power is supplied from a constant current source 4 to the capacitor C through a transistor Q1 to clamp up the head level of the said synchronous signal and output the head level through an output circuit. At the charging time of the head level of the said synchronous signal, current flowing into a transistor Q6 is reduced by the amount of charging current for clamping. Consequently, the voltage fall at a resistance R10 is reduced and the level shifting amount of the head level of the synchronous signal of a positive polarity video signal appearing at a connection point 8 is reduced. Thus, the compressive reduction (depression) of the head level of the synchronous signal is corrected by the reduction of the said level shifting amount.
JP56037764A 1981-03-18 1981-03-18 Synchronous signal clamping circuit for video signal Granted JPS57152779A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56037764A JPS57152779A (en) 1981-03-18 1981-03-18 Synchronous signal clamping circuit for video signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56037764A JPS57152779A (en) 1981-03-18 1981-03-18 Synchronous signal clamping circuit for video signal

Publications (2)

Publication Number Publication Date
JPS57152779A true JPS57152779A (en) 1982-09-21
JPH023586B2 JPH023586B2 (en) 1990-01-24

Family

ID=12506532

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56037764A Granted JPS57152779A (en) 1981-03-18 1981-03-18 Synchronous signal clamping circuit for video signal

Country Status (1)

Country Link
JP (1) JPS57152779A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2537814A1 (en) * 1982-12-08 1984-06-15 Thomson Brandt Gmbh Video signal processing circuit
JPS6266464U (en) * 1985-10-17 1987-04-24
JPS63102366U (en) * 1986-12-20 1988-07-04

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2537814A1 (en) * 1982-12-08 1984-06-15 Thomson Brandt Gmbh Video signal processing circuit
JPS6266464U (en) * 1985-10-17 1987-04-24
JPS63102366U (en) * 1986-12-20 1988-07-04

Also Published As

Publication number Publication date
JPH023586B2 (en) 1990-01-24

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