JPS57118492A - Color density control circuit - Google Patents

Color density control circuit

Info

Publication number
JPS57118492A
JPS57118492A JP18491880A JP18491880A JPS57118492A JP S57118492 A JPS57118492 A JP S57118492A JP 18491880 A JP18491880 A JP 18491880A JP 18491880 A JP18491880 A JP 18491880A JP S57118492 A JPS57118492 A JP S57118492A
Authority
JP
Japan
Prior art keywords
circuit
color density
signal
level
color
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
JP18491880A
Other languages
Japanese (ja)
Inventor
Kanji Oda
Yoshihisa Tomita
Meguri Kume
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP18491880A priority Critical patent/JPS57118492A/en
Publication of JPS57118492A publication Critical patent/JPS57118492A/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
    • H04N9/77—Circuits for processing the brightness signal and the chrominance signal relative to each other, e.g. adjusting the phase of the brightness signal relative to the colour signal, correcting differential gain or differential phase

Abstract

PURPOSE:To reduce the color noise, by fetching the video signals darker than the set level, supplying the output signal to a terminal that controls the amplification factor of the color density and controlling the amplification of color density in accordance with the brightness. CONSTITUTION:The signal output received the video wave detection is connected to an input terminal 5A of a control circuit 5, and the circuit 5 is connected to a color demodulating circuit 7. The video signal applied to an input terminal 13 of a comparison/detection circuit 11 is compared with the level set within the circuit 11, and only the signals darker than this set level are detected. The next level shifting circuit 12 functions to give the DC level shift to the detected signal, and this output signal is applied to a color density control terminal 5B of the circuit 5. Thus the amplification factor of the color density is controlled in accordance with the brightness of the signal.
JP18491880A 1980-12-25 1980-12-25 Color density control circuit Pending JPS57118492A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18491880A JPS57118492A (en) 1980-12-25 1980-12-25 Color density control circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18491880A JPS57118492A (en) 1980-12-25 1980-12-25 Color density control circuit

Publications (1)

Publication Number Publication Date
JPS57118492A true JPS57118492A (en) 1982-07-23

Family

ID=16161602

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18491880A Pending JPS57118492A (en) 1980-12-25 1980-12-25 Color density control circuit

Country Status (1)

Country Link
JP (1) JPS57118492A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02235494A (en) * 1989-03-09 1990-09-18 Nippon Hoso Kyokai <Nhk> Low brightness level correction system for reception color television signal
EP0551189A2 (en) * 1992-01-09 1993-07-14 Matsushita Electric Industrial Co., Ltd. Video signal correction system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02235494A (en) * 1989-03-09 1990-09-18 Nippon Hoso Kyokai <Nhk> Low brightness level correction system for reception color television signal
EP0551189A2 (en) * 1992-01-09 1993-07-14 Matsushita Electric Industrial Co., Ltd. Video signal correction system
EP0551189A3 (en) * 1992-01-09 1994-02-02 Matsushita Electric Ind Co Ltd
US5351141A (en) * 1992-01-09 1994-09-27 Matsushita Electric Industrial Co., Ltd. Video signal correction system

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