JPS55154893A - Improving circuit for frequency characteristic of color signal - Google Patents

Improving circuit for frequency characteristic of color signal

Info

Publication number
JPS55154893A
JPS55154893A JP6303879A JP6303879A JPS55154893A JP S55154893 A JPS55154893 A JP S55154893A JP 6303879 A JP6303879 A JP 6303879A JP 6303879 A JP6303879 A JP 6303879A JP S55154893 A JPS55154893 A JP S55154893A
Authority
JP
Japan
Prior art keywords
signal
supplied
frequency
luminance signal
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
JP6303879A
Other languages
Japanese (ja)
Inventor
Takafumi Okada
Yutaka Tanaka
Atsushi Matsuzaki
Toshinobu Isobe
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.)
Sony Corp
Original Assignee
Sony Corp
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 Sony Corp filed Critical Sony Corp
Priority to JP6303879A priority Critical patent/JPS55154893A/en
Publication of JPS55154893A publication Critical patent/JPS55154893A/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 make it possible to reproduce pictures of high quality all the time by improving color resolution by performing high-frequcny compensation of a color signal only when the value of a luminance signal decreases below a fixed value. CONSTITUTION:Demodulated color difference signal (R-Y)N supplied to terminal 1 is supplied to LPF2 to extract low-frequency color difference signal (R-Y)L. Further, luminance signal YW supplied to terminal 3 is supplied to LPF4 to extract only low-frequency luminance signal YL, which is supplied together with signal (R-Y)L to divider 5, which obtains their ratio (R-Y)L/YL. Together with high-frequency luminance signal YH obtained by HPF6, the ratio output is supplied to multiplier 7 to find product (R-Y)H of the both. The output of this product is mixed into signal (R-Y)L by synthesizer 8 to obtain composite output (R-Y)W, so that the frequency band of a color difference signal of red appears to be widened. In this case, forming circuit 20 for a switching signal turns ON switch circuit 10 on receiving input color information with the luminance signal below a fixed value, providing high-frequency compensation.
JP6303879A 1979-05-21 1979-05-21 Improving circuit for frequency characteristic of color signal Pending JPS55154893A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6303879A JPS55154893A (en) 1979-05-21 1979-05-21 Improving circuit for frequency characteristic of color signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6303879A JPS55154893A (en) 1979-05-21 1979-05-21 Improving circuit for frequency characteristic of color signal

Publications (1)

Publication Number Publication Date
JPS55154893A true JPS55154893A (en) 1980-12-02

Family

ID=13217753

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6303879A Pending JPS55154893A (en) 1979-05-21 1979-05-21 Improving circuit for frequency characteristic of color signal

Country Status (1)

Country Link
JP (1) JPS55154893A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4559554A (en) * 1982-09-22 1985-12-17 Sony Corporation Color television camera with a single image pickup tube featuring improved rendition of bright monochromatic objects
JPH05236496A (en) * 1992-02-21 1993-09-10 Victor Co Of Japan Ltd Color signal correcting device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4559554A (en) * 1982-09-22 1985-12-17 Sony Corporation Color television camera with a single image pickup tube featuring improved rendition of bright monochromatic objects
JPH05236496A (en) * 1992-02-21 1993-09-10 Victor Co Of Japan Ltd Color signal correcting device

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