JPS56119581A - Clamp circuit - Google Patents

Clamp circuit

Info

Publication number
JPS56119581A
JPS56119581A JP2246880A JP2246880A JPS56119581A JP S56119581 A JPS56119581 A JP S56119581A JP 2246880 A JP2246880 A JP 2246880A JP 2246880 A JP2246880 A JP 2246880A JP S56119581 A JPS56119581 A JP S56119581A
Authority
JP
Japan
Prior art keywords
circuit
synchronizing
horizontal
monostable multivibrator
signal
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
JP2246880A
Other languages
Japanese (ja)
Other versions
JPH0153545B2 (en
Inventor
Ichiji Munesawa
Toshihiko Tsuru
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP2246880A priority Critical patent/JPS56119581A/en
Publication of JPS56119581A publication Critical patent/JPS56119581A/en
Publication of JPH0153545B2 publication Critical patent/JPH0153545B2/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

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Picture Signal Circuits (AREA)
  • Manipulation Of Pulses (AREA)

Abstract

PURPOSE:To perform clamping stably even if a horizontal and a vertical synchronizing signals are not synchronized, by delaying a synchronizing signal, which is derived by a synchronizing separating circuit, in a monostable multivibrator by a prescribed quantity to cause it to correspond to a back porch of a horizontal synchronizing signal. CONSTITUTION:The TV signal input from terminal 1 is sent to clamp circuit 2 and synchronizing separating circuit 3. Synchronizing signal P1 derived by circuit 3 is delayed in monostable multivibrator 4 by a prescribed quantity and is caused to correspond to the back porch of the horizontal synchronizing signal. Output P2 of monostable multivibrator 4 and output P1 of circuit 3 are operated for AND by AND gate 5 to generate clamp pulse P2. Clamp pulse P3 from gate 5 is sent to circuit 2. If output P2 of monostable multivibrator 4 is in the position of vertical synchronizing signal S2, the TV signal is not raised because pulse P3 is not generated. As a result, stable clamping is performed even if horizontal and vertical synchronizing signals are not synchronized.
JP2246880A 1980-02-25 1980-02-25 Clamp circuit Granted JPS56119581A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2246880A JPS56119581A (en) 1980-02-25 1980-02-25 Clamp circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2246880A JPS56119581A (en) 1980-02-25 1980-02-25 Clamp circuit

Publications (2)

Publication Number Publication Date
JPS56119581A true JPS56119581A (en) 1981-09-19
JPH0153545B2 JPH0153545B2 (en) 1989-11-14

Family

ID=12083532

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2246880A Granted JPS56119581A (en) 1980-02-25 1980-02-25 Clamp circuit

Country Status (1)

Country Link
JP (1) JPS56119581A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5856579A (en) * 1981-09-30 1983-04-04 Nec Home Electronics Ltd Video clamp circuit
JPS6175673A (en) * 1984-09-20 1986-04-18 Fujitsu General Ltd Peak clamp circuit
JPS6217275U (en) * 1985-07-17 1987-02-02
JPS63164767A (en) * 1986-12-26 1988-07-08 Matsushita Electric Ind Co Ltd Television video signal controller

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51163822U (en) * 1975-06-20 1976-12-27

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51163822U (en) * 1975-06-20 1976-12-27

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5856579A (en) * 1981-09-30 1983-04-04 Nec Home Electronics Ltd Video clamp circuit
JPH0421386B2 (en) * 1981-09-30 1992-04-09 Nippon Denki Hoomu Erekutoronikusu Kk
JPS6175673A (en) * 1984-09-20 1986-04-18 Fujitsu General Ltd Peak clamp circuit
JPS6217275U (en) * 1985-07-17 1987-02-02
JPS63164767A (en) * 1986-12-26 1988-07-08 Matsushita Electric Ind Co Ltd Television video signal controller

Also Published As

Publication number Publication date
JPH0153545B2 (en) 1989-11-14

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