| 摘要 |
<p>PURPOSE:To prevent the compressibility from decreasing due to the superposition of a chrominance signal upon a luminance signal by making a prescribed array of sampling points and by increasing bits allotted to a lower sequence and decreasing bits allotted to a higher sequence respectively. CONSTITUTION:A color television signal is encoded by A/D converter 2 into an eight-bit signal, for example, and sampled values at eight sampling points of horizontal scanning lines adjoining mutually to the same horizontal scanning line, adjoining vertically and adjoining in the frame direction are stored memory 3 while the same phase relation with a chrominance subcarrier is born. Next, sampled values in one block are read out of memory 3, sampling points of Hadamard's transformation are made into blocks while the attention to the phase of the chrominance subcarrier is paid, and Hadamard transformation device 4 performs the Hadamard's transformation to find sequences h1-h8 of degree eight. Further, quantizer 5 quantizes every sequency by the best bit allotment to compress the band.</p> |
