Claims
- 1. A hue control circuit comprising:
- means for separating a modulated chrominance component from a luminance component in a composite television signal;
- means for filtering the modulated chrominance component using a set of coefficients corresponding to a desired hue adjustment, the set of coefficients being selected from a plurality of sets of coefficients with each set of coefficients representing a different phase offset, to produce an adjusted modulated chrominance component; and
- means for combining the adjusted modulated chrominance component with the luminance component to produce an output composite television signal incorporating the desired hue adjustment.
- 2. A hue control circuit comprising:
- means for separating a modulated chrominance component from a luminance component in a composite television signal;
- a polyphase interpolator having the modulated chrominance component as an input and producing an adjusted modulated chrominance component as an output, the adjusted modulated chrominance component being determined by a set of coefficients applied to the polyphase interpolator;
- means for storing sets of coefficients for the polyphase interpolator;
- means for addressing the sets of coefficients to select the set of coefficients corresponding to a desired hue adjustment as a function of a hue control signal, such selection occurring during a horizontal blanking interval of the composite television signal; and
- means for combining the adjusted modulated chrominance component with the luminance component to produce an output composite television signal incorporating the desired hue adjustment.
- 3. A hue control circuit as recited in claim 2 wherein the composite television signal is a composite PAL television signal, the sets of coefficients are in the form of complementary pairs, and the addressing means swaps between the sets of coefficients forming a complementary pair for the desired hue adjustment in synchronization with a color difference component of the modulated chrominance component that changes sign from line to line of the composite PAL television signal.
Parent Case Info
This is a continuation of application Ser. No. 08/020,937 filed Feb. 22, 1993 and now abandoned.
US Referenced Citations (5)
Number |
Name |
Date |
Kind |
3872498 |
Pritchard |
Mar 1975 |
|
4359756 |
Schneider et al. |
Oct 1982 |
|
4644389 |
Nakagawa et al. |
Feb 1987 |
|
4860091 |
Kimura et al. |
Aug 1989 |
|
5182633 |
Antonio et al. |
Jan 1993 |
|
Foreign Referenced Citations (1)
Number |
Date |
Country |
0077486 |
Apr 1986 |
JPX |
Continuations (1)
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Number |
Date |
Country |
Parent |
20937 |
Feb 1993 |
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