| 摘要 |
A system for the digital decoding of composite video signals (CVBS), comprising a brightness signal (luminance component Y) and two color difference signals (chrominance components U, V). The system modulates a color subcarrier according to the quadrature amplitude modulation principle, in which a plurality (N) of sample values of the video signal are transformed by a Walsh-Hadamard transformation (WHT) from the pixel domain into the WHT domain. The color difference signals (U, V) are derived as specific WHT coefficients of the WHT matrix obtained. The WHT coefficients determining the color difference signals (U, V) are subtracted from the WHT matrix. The WHT matrix is transformed back into the pixel domain an inverse Walsh-Hadamard transformation (IWHT), and the brightness signal (Y) are derived from the IWHT result.
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