JPS5555688A - Control circuit for color saturation degree - Google Patents

Control circuit for color saturation degree

Info

Publication number
JPS5555688A
JPS5555688A JP12861678A JP12861678A JPS5555688A JP S5555688 A JPS5555688 A JP S5555688A JP 12861678 A JP12861678 A JP 12861678A JP 12861678 A JP12861678 A JP 12861678A JP S5555688 A JPS5555688 A JP S5555688A
Authority
JP
Japan
Prior art keywords
electric field
field strength
voltage
trq12
trq1
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
JP12861678A
Other languages
Japanese (ja)
Inventor
Toshihiro Kugimura
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 JP12861678A priority Critical patent/JPS5555688A/en
Publication of JPS5555688A publication Critical patent/JPS5555688A/en
Pending legal-status Critical Current

Links

Landscapes

  • Processing Of Color Television Signals (AREA)

Abstract

PURPOSE: To suppress the deterioration of reproduced picture, by picking up the voltage used for intermediate frequency AGC from the video detection state on input electric field strength, and adjusting the color saturation degree at strong and weak electric fields automatically.
CONSTITUTION: The intermediate frequency AGC voltage is fed to the base of transistor TrQ10 in Darlington connection, and the potential of the resistors 12 and 13 connected to the emitter of TrQ11 is changed with the DC voltage on the input electric field strength. Further, TrQ12 is made conductive or non-conductive, by the potential change of the resistors 12 and 13 connected to the emitter of TrQ11. Moreover. the base voltage of TrQ1 of the differential amplifier consisting of TrQ1, Q2 amplifying the carrier chrominance signal is set with TrQ12 operated as the variable impedance element, variable resistor 17, 18 and resistors 14, 15 so that the gain of TrQ1 can be controlled with the condition of TrQ12. Further, when input electic field strength is strong, the color saturation degree is determined independently of the electric field strength and it is lowered in case of a weak electric field, allowing to suppress the deterioration of reproduced picture.
COPYRIGHT: (C)1980,JPO&Japio
JP12861678A 1978-10-20 1978-10-20 Control circuit for color saturation degree Pending JPS5555688A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12861678A JPS5555688A (en) 1978-10-20 1978-10-20 Control circuit for color saturation degree

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12861678A JPS5555688A (en) 1978-10-20 1978-10-20 Control circuit for color saturation degree

Publications (1)

Publication Number Publication Date
JPS5555688A true JPS5555688A (en) 1980-04-23

Family

ID=14989183

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12861678A Pending JPS5555688A (en) 1978-10-20 1978-10-20 Control circuit for color saturation degree

Country Status (1)

Country Link
JP (1) JPS5555688A (en)

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