JPS561676A - Luminance adjuster - Google Patents

Luminance adjuster

Info

Publication number
JPS561676A
JPS561676A JP7733179A JP7733179A JPS561676A JP S561676 A JPS561676 A JP S561676A JP 7733179 A JP7733179 A JP 7733179A JP 7733179 A JP7733179 A JP 7733179A JP S561676 A JPS561676 A JP S561676A
Authority
JP
Japan
Prior art keywords
forming
circuit
video signal
pulse
held
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
JP7733179A
Other languages
Japanese (ja)
Other versions
JPS6324355B2 (en
Inventor
Mitsuya Masuda
Minoru Miyata
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 JP7733179A priority Critical patent/JPS561676A/en
Publication of JPS561676A publication Critical patent/JPS561676A/en
Publication of JPS6324355B2 publication Critical patent/JPS6324355B2/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

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Picture Signal Circuits (AREA)
  • Television Receiver Circuits (AREA)

Abstract

PURPOSE:To increase the DC regeneration factor by providing the two-way circuit which conducts with the flyback pulse, at the same time preventing occurrence of the sag or the like due to the contents of the video signal and thus securing the steady working at the idle channel time. CONSTITUTION:The signal supplied from input terminal 1 of the composite video signal is amplified by transistors TR3 and 4 forming an amplifier circuit, and the amplified signal is applied to TR6 and 7 forming a two-way switching circuit to be sample-held by the pulse supplied from sampling pulse input terminal 8. Thus the pedestal level of the video signal is held at holding capacitor 9. A comparison is carried out via TR10 and 11 forming a differential amplifier between the held voltage and the reference voltage of TR12 for luminance adjustment. This comparison output voltage is fed back to the input side in the form of the DC level setting bias of video signal and via TR13 forming a feedback circuit. Then TR16 and 17 which form the two-way switching circuit conducting with the pulse sent from input terminal 15 of the flyback pulse used for the input are provided to the circuit. Thus the DC regeneration factor can be increased.
JP7733179A 1979-06-19 1979-06-19 Luminance adjuster Granted JPS561676A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7733179A JPS561676A (en) 1979-06-19 1979-06-19 Luminance adjuster

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7733179A JPS561676A (en) 1979-06-19 1979-06-19 Luminance adjuster

Publications (2)

Publication Number Publication Date
JPS561676A true JPS561676A (en) 1981-01-09
JPS6324355B2 JPS6324355B2 (en) 1988-05-20

Family

ID=13630937

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7733179A Granted JPS561676A (en) 1979-06-19 1979-06-19 Luminance adjuster

Country Status (1)

Country Link
JP (1) JPS561676A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5158861A (en) * 1974-11-20 1976-05-22 Hitachi Ltd

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5158861A (en) * 1974-11-20 1976-05-22 Hitachi Ltd

Also Published As

Publication number Publication date
JPS6324355B2 (en) 1988-05-20

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