JPS57124989A - Color television receiver - Google Patents

Color television receiver

Info

Publication number
JPS57124989A
JPS57124989A JP56010536A JP1053681A JPS57124989A JP S57124989 A JPS57124989 A JP S57124989A JP 56010536 A JP56010536 A JP 56010536A JP 1053681 A JP1053681 A JP 1053681A JP S57124989 A JPS57124989 A JP S57124989A
Authority
JP
Japan
Prior art keywords
circuit
electric field
gain
voltage
field strength
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
JP56010536A
Other languages
Japanese (ja)
Other versions
JPS6244756B2 (en
Inventor
Hisao Omori
Yoichi Uchiumi
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.)
Victor Company of Japan Ltd
Nippon Victor KK
Original Assignee
Victor Company of Japan Ltd
Nippon Victor KK
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 Victor Company of Japan Ltd, Nippon Victor KK filed Critical Victor Company of Japan Ltd
Priority to JP56010536A priority Critical patent/JPS57124989A/en
Publication of JPS57124989A publication Critical patent/JPS57124989A/en
Publication of JPS6244756B2 publication Critical patent/JPS6244756B2/ja
Granted 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
    • H04N9/646—Circuits for processing colour signals for image enhancement, e.g. vertical detail restoration, cross-colour elimination, contour correction, chrominance trapping filters

Landscapes

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

Abstract

PURPOSE:To achieve an excellent picture by automatically reducing chroma noise at weak electric field district, through the control of an overall gain of a chroma signal system added with a color saturation control circuit and the like to a TV receiver having an AGC circuit at a chrominance carrier signal amplifying stage. CONSTITUTION:A gain control voltage (a) from an existing AGC circuit 5 changes in proportion to the electric field strength and the level is compared with a reference signal (c) from a voltage source 16 at a comparison circuit 15. When (a)>(c), a prescribed DC voltage (b) is outputted to keep the gain of a chrominance signal amplifying circuit 11 constant. On the other hand, if the electric field strength is smaller than the reference value, a voltage proportional to an input gain control voltage is outputted, the polarity and level are adjusted via a color saturation control circuit 17, and applied to the circuit 11 to control the gain so that it is proportional to the electric field strength. As a result, the overall gain of the chroma signal system circuit is constant when the electric field strength is greater than the set value, and is gradually decreased, when smaller. Thus, chroma noise at a weak electric field area can automatically be reduced, allowing to decrease the deterioration in video quality.
JP56010536A 1981-01-27 1981-01-27 Color television receiver Granted JPS57124989A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56010536A JPS57124989A (en) 1981-01-27 1981-01-27 Color television receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56010536A JPS57124989A (en) 1981-01-27 1981-01-27 Color television receiver

Publications (2)

Publication Number Publication Date
JPS57124989A true JPS57124989A (en) 1982-08-04
JPS6244756B2 JPS6244756B2 (en) 1987-09-22

Family

ID=11752979

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56010536A Granted JPS57124989A (en) 1981-01-27 1981-01-27 Color television receiver

Country Status (1)

Country Link
JP (1) JPS57124989A (en)

Also Published As

Publication number Publication date
JPS6244756B2 (en) 1987-09-22

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