| 摘要 |
<p>An NTSC compatible, single channel widescreen EDTV system encodes and decodes a television signal comprising (1) a main, standard format NTSC signal (N) with auxiliary low frequency side panel image information compressed into an overscan region thereof; (2) auxiliary high frequency side panel image information (X); and (3) auxiliary high frequency horizontal luminance information (Z). At an encoder, components 2 (X) and 3 (Z) are intraframe averaged (64, 76) before modulating an alternate subcarrier (ASC). Component 1 (N) is intraframe averaged (38) above a given frequency before being combined (40) with the modulated alternate subcarrier.</p> |
