JPS5676694A - Chroma signal processing circuit - Google Patents

Chroma signal processing circuit

Info

Publication number
JPS5676694A
JPS5676694A JP15377679A JP15377679A JPS5676694A JP S5676694 A JPS5676694 A JP S5676694A JP 15377679 A JP15377679 A JP 15377679A JP 15377679 A JP15377679 A JP 15377679A JP S5676694 A JPS5676694 A JP S5676694A
Authority
JP
Japan
Prior art keywords
signal
color killer
circuit
gain
chroma
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
JP15377679A
Other languages
Japanese (ja)
Other versions
JPH021435B2 (en
Inventor
Kazuo Tokuda
Tatsuyuki Amano
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 JP15377679A priority Critical patent/JPS5676694A/en
Publication of JPS5676694A publication Critical patent/JPS5676694A/en
Publication of JPH021435B2 publication Critical patent/JPH021435B2/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
    • H04N9/70—Circuits for processing colour signals for colour killing
    • H04N9/71—Circuits for processing colour signals for colour killing combined with colour gain control

Landscapes

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

Abstract

PURPOSE:To prevent a chroma noise production, to make complete the signal interrupting operation of a color killer circuit and to block the input of a residual leakage component to a color demodulation circuit, by attenuating the gain of the ACC amplifier at color killer, in a chroma signal processing circuit. CONSTITUTION:At the color killer operation, when the input signal 1 is at chroma signal, the gain of the ACC amplifier 2' is made zero with the color killer detection circuit 8. Thus, even at the black and white signal input without the burst signal, since the gain of the ACC amplifier 2' can be attenuated, without excessively increasing the video signal of black and white broadcast and charrier chrominance signal frequency band of noise, thus the signal interrupting operation for the color killer circuit can not be inactive.
JP15377679A 1979-11-28 1979-11-28 Chroma signal processing circuit Granted JPS5676694A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15377679A JPS5676694A (en) 1979-11-28 1979-11-28 Chroma signal processing circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15377679A JPS5676694A (en) 1979-11-28 1979-11-28 Chroma signal processing circuit

Publications (2)

Publication Number Publication Date
JPS5676694A true JPS5676694A (en) 1981-06-24
JPH021435B2 JPH021435B2 (en) 1990-01-11

Family

ID=15569882

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15377679A Granted JPS5676694A (en) 1979-11-28 1979-11-28 Chroma signal processing circuit

Country Status (1)

Country Link
JP (1) JPS5676694A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5389979A (en) * 1991-05-13 1995-02-14 Gold Star Co., Ltd. Chrominance signal playback system and method for video cassette recorders having noise suppression of the chrominance signal

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4913412A (en) * 1972-06-02 1974-02-05
JPS4925773A (en) * 1972-05-31 1974-03-07
JPS561683A (en) * 1979-06-18 1981-01-09 Victor Co Of Japan Ltd Color signal processing circuit

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4925773A (en) * 1972-05-31 1974-03-07
JPS4913412A (en) * 1972-06-02 1974-02-05
JPS561683A (en) * 1979-06-18 1981-01-09 Victor Co Of Japan Ltd Color signal processing circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5389979A (en) * 1991-05-13 1995-02-14 Gold Star Co., Ltd. Chrominance signal playback system and method for video cassette recorders having noise suppression of the chrominance signal

Also Published As

Publication number Publication date
JPH021435B2 (en) 1990-01-11

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