JPS568977A - Video amplifying circuit - Google Patents

Video amplifying circuit

Info

Publication number
JPS568977A
JPS568977A JP8400379A JP8400379A JPS568977A JP S568977 A JPS568977 A JP S568977A JP 8400379 A JP8400379 A JP 8400379A JP 8400379 A JP8400379 A JP 8400379A JP S568977 A JPS568977 A JP S568977A
Authority
JP
Japan
Prior art keywords
screen
signal
multiplex
character
image
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
JP8400379A
Other languages
Japanese (ja)
Inventor
Shigeru Saito
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP8400379A priority Critical patent/JPS568977A/en
Publication of JPS568977A publication Critical patent/JPS568977A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/64—Circuits for processing colour signals
    • H04N9/648—Video amplifiers

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Color Television Systems (AREA)

Abstract

PURPOSE:To reduce the saturation of a charactor multiplex screen in case of a mixed screen by applying the amplifier of a multiplex character signal circuit with a positive voltage for a character multiplex screen or no voltage for a TV video screen or mixed screen of a TV image and multiplexed characters. CONSTITUTION:A chromaticity signal of a TV image is input to the base of amplifying transistor TR10, a luminance signal of the TV image from terminal 8 to the emitter. A multiplex character signal, on the other hand, is applied from input terminal 20 to the emitter of TR10 through an amplifier including TR16 and a signal from a character multiplex signal demodulator that is not shown in the figure is supplied to base input terminal 21 of amplifier TR17 connected to TR16 at their collectors. Then, its signal input is applied with a positive voltage for a character multiplex screen or no voltage for a TV video screen or mixed screen of the TV image and multiplexed characters. Consequently, the saturation of the character multiplex screen can be reduced at the time of the mixed screen.
JP8400379A 1979-07-04 1979-07-04 Video amplifying circuit Pending JPS568977A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8400379A JPS568977A (en) 1979-07-04 1979-07-04 Video amplifying circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8400379A JPS568977A (en) 1979-07-04 1979-07-04 Video amplifying circuit

Publications (1)

Publication Number Publication Date
JPS568977A true JPS568977A (en) 1981-01-29

Family

ID=13818381

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8400379A Pending JPS568977A (en) 1979-07-04 1979-07-04 Video amplifying circuit

Country Status (1)

Country Link
JP (1) JPS568977A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4622589A (en) * 1985-04-15 1986-11-11 Rca Corporation Television receiver on-screen character display

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4622589A (en) * 1985-04-15 1986-11-11 Rca Corporation Television receiver on-screen character display

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