ARRANGEMENT FOR PROCESSING A WIDE TELEVISION SIGNAL OF EXTENDED RESOLUTION WITH AN ALTERNATIVE AUXILIARY

摘要

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