| 摘要 |
<p>PROBLEM TO BE SOLVED: To reduce the circuit scale and to suppress deterioration in the quality of digital output data by separating a luminance signal and a chrominance signal from a color video signal and converting them by different A/D converters. SOLUTION: A Y/C separate section 13 (23) separates a luminance signal Y1 (Y2) from a color video signal SV1 (SV2), an A/D converter 14 (24) converts the separated signal into a digital signal to provide an 8-bit digital luminance signal DY1 (DY2). An A/D converter 16 (26) converts a color difference signal D(R-Y)1 (2) being an output of a color difference decoder 15 (25) and provides an output of a 8-bit (6-bit) digital color difference signal D(R-Y)1 (2). Furthermore, an A/D converter 17 (27) provides an output of an 8-bit (6-bit) digital color difference signal D(B-Y)1 (2) similarly to the case with the converters 16, 26. Since the number of bits of the signals D(R-Y)2, D(B-Y)2 is smaller than the number of bits of the signals DY1, 2, the circuit scale of the converters is reduced and the entire circuit scale is decreased.</p> |
