JPS57207483A - Clamp circuit - Google Patents

Clamp circuit

Info

Publication number
JPS57207483A
JPS57207483A JP56093211A JP9321181A JPS57207483A JP S57207483 A JPS57207483 A JP S57207483A JP 56093211 A JP56093211 A JP 56093211A JP 9321181 A JP9321181 A JP 9321181A JP S57207483 A JPS57207483 A JP S57207483A
Authority
JP
Japan
Prior art keywords
video signal
input video
clamp pulse
output
component
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
JP56093211A
Other languages
Japanese (ja)
Inventor
Yoshikazu Imazu
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP56093211A priority Critical patent/JPS57207483A/en
Publication of JPS57207483A publication Critical patent/JPS57207483A/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
    • H04N5/14—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
    • H04N5/185—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 for the black level

Abstract

PURPOSE:To perform complete DC component reproduction, by sample-holding an input video signal with a clamp pulse to obtain, the output difference between the output and the input video signal, and fixing the input video signal to zero potential. CONSTITUTION:An output of a sample hold circuit 1 is applied to an inverting input terminal of an operational amplifier 2 via a resistor 3, an input video signal is voltage-divided with resistors 4 and 5, and applied to a non-inverting input terminal of the amplifier 2. Thus, even if a DC component is lost with a CR coupler or the like, a DC component differential voltage is outputted at the point of existing time of a clamp pulse at the circuit 1 and held until the next clamp pulse, and a signal fixing the input video signal to zero potential is outputted at a clamp pulse period with the difference voltage subtracted from the input video signal with a differential amplifier.
JP56093211A 1981-06-17 1981-06-17 Clamp circuit Pending JPS57207483A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56093211A JPS57207483A (en) 1981-06-17 1981-06-17 Clamp circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56093211A JPS57207483A (en) 1981-06-17 1981-06-17 Clamp circuit

Publications (1)

Publication Number Publication Date
JPS57207483A true JPS57207483A (en) 1982-12-20

Family

ID=14076228

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56093211A Pending JPS57207483A (en) 1981-06-17 1981-06-17 Clamp circuit

Country Status (1)

Country Link
JP (1) JPS57207483A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5919469A (en) * 1982-07-23 1984-01-31 Sony Corp Clamp circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5919469A (en) * 1982-07-23 1984-01-31 Sony Corp Clamp circuit
JPH0430229B2 (en) * 1982-07-23 1992-05-21

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