YC separator circuit
First Claim
1. A YC separator circuit comprising:
- a color signal separator circuit for separating a color signal from a composite signal using a two-line comb filter or a three-line comb filter;
a first luminance signal separator circuit for separating a luminance signal by subtracting the color signal separated by said color signal separator circuit from said composite signal;
a second luminance signal separator circuit for separating a luminance signal from said composite signal using a frequency filter;
a luminance correlation determining circuit for calculating a difference between respective luminance signals input from said first and second luminance signal separator circuits; and
a selector circuit for selectively outputting the luminance signal separated by said first luminance signal separator circuit when said difference is larger than a predetermined value, and for selectively outputting the luminance signal separated by said second luminance signal separator circuit when said difference is smaller than a second predetermined value (first predetermined value=second predetermined value).
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Accused Products
Abstract
A YC separator circuit which is capable of achieving YC separation at a high accuracy. The YC separator circuit comprises line memories, bandpass filters, an edge detector circuit, a color correlation determining circuit, and a YC separation filter circuit. The YC separator circuit separates a C signal from a composite signal using a two-line comb filter or a three-line comb filter. The subtractor subtracts the C signal separated by the YC separation filter circuit from the composite signal to separate a Y signal. A trap filter is a frequency filter for dividing a Y signal from a composite signal. A luminance correlation determining circuit calculates a difference between the Y signals received from the subtractor and trap filter, and outputs the Y signal separated by the subtractor when the difference is larger than a predetermined value, and outputs the Y signal separated by the trap filter when the difference is smaller than the predetermined value.
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Citations
12 Claims
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1. A YC separator circuit comprising:
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a color signal separator circuit for separating a color signal from a composite signal using a two-line comb filter or a three-line comb filter; a first luminance signal separator circuit for separating a luminance signal by subtracting the color signal separated by said color signal separator circuit from said composite signal; a second luminance signal separator circuit for separating a luminance signal from said composite signal using a frequency filter; a luminance correlation determining circuit for calculating a difference between respective luminance signals input from said first and second luminance signal separator circuits; and a selector circuit for selectively outputting the luminance signal separated by said first luminance signal separator circuit when said difference is larger than a predetermined value, and for selectively outputting the luminance signal separated by said second luminance signal separator circuit when said difference is smaller than a second predetermined value (first predetermined value=second predetermined value). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification