JPS6486787A - Automatic chrominance signal control circuit - Google Patents
Automatic chrominance signal control circuitInfo
- Publication number
- JPS6486787A JPS6486787A JP24546887A JP24546887A JPS6486787A JP S6486787 A JPS6486787 A JP S6486787A JP 24546887 A JP24546887 A JP 24546887A JP 24546887 A JP24546887 A JP 24546887A JP S6486787 A JPS6486787 A JP S6486787A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- adder
- xcb
- xcf
- control circuit
- 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
Links
Landscapes
- Processing Of Color Television Signals (AREA)
Abstract
PURPOSE:To improve fast responsiveness for change in an input burst signal level and stability for a noise by utilizing the fast responsiveness of a feedback type automatic color control circuit and the stability for the noise of a feed forward type automatic color control circuit. CONSTITUTION:A burst sampling circuit 12 samples a burst signal Ub(n). The Ub(n) is multiplied by a control signal Xc(n) by a multiplier 14, and is derived as an output signal Y(n). The subtraction processing of a reference signal r(n) and the signal Y(n) is performed at an adder 16, and a differential signal becomes a signal Xcb(n) via a non-linear circuit 18, an integrator 19, and a coefficient multiplier 20, and is supplied to the input terminal on one side of an adder 21. Meanwhile, an arithmetic operation of r(n)/Ub(n) is performed at a signal conversion circuit 31, and its output becomes a signal Xcf(n) via a coefficient multiplier 32 and an integrator 33, and is supplied to the adder 21. The adder 21 adds the Xcb(n) and the Xcf(n), and outputs the Xc(n). Control is performed by the Xcb(n) while a difference between the Ub(n) and the Y(n) is large, and by the Xcf(n) after a control state is stabilized.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP24546887A JPS6486787A (en) | 1987-09-29 | 1987-09-29 | Automatic chrominance signal control circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP24546887A JPS6486787A (en) | 1987-09-29 | 1987-09-29 | Automatic chrominance signal control circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6486787A true JPS6486787A (en) | 1989-03-31 |
Family
ID=17134109
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP24546887A Pending JPS6486787A (en) | 1987-09-29 | 1987-09-29 | Automatic chrominance signal control circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6486787A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03145380A (en) * | 1989-10-31 | 1991-06-20 | Sony Corp | Automatic picture quality adjustor |
-
1987
- 1987-09-29 JP JP24546887A patent/JPS6486787A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03145380A (en) * | 1989-10-31 | 1991-06-20 | Sony Corp | Automatic picture quality adjustor |
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