| 摘要 |
PCT No. PCT/GB92/00143 Sec. 371 Date Sep. 17, 1992 Sec. 102(e) Date Sep. 17, 1992 PCT Filed Jan. 24, 1992 PCT Pub. No. WO92/13425 PCT Pub. Date Aug. 6, 1992.An assembler and splitter of a Weston PAL (W-PAL) video signal has filter functions F1, F2 at the assembler for the luminance and chrominance components and corresponding functions F3, F4 at the splitter. The transfer functions are defined as F1=(L2+L1)/2+(L2-L1)z-1/2, F2=-(H1-H2)/2+(H1+H2)z-1/2, F3=(L2-L1)/2+(L2+L1)z-1/2, F4=(H1+H2)/2-(H1-H2)z-1/2 and wherein H1 (f)=L2 (2fsc-f) and H2 (f)=L1 (2fsc-f). Thus the filters are non-sharp cut and are compatible with normal PAL.
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