Abstract
Two intraframe hierarchical coding schemes based on a subband coding strategy are proposed for the broadband integrated services digital network (BISDN). High-definition TV (HDTV) and extended-quality TV (EQTV) coexist on the network. The two schemes presented code the HDTV signal for the 135 Mb/s channel, while the EQTV signal is coded for the 45 Mb/s subchannel. A theoretical analysis of hierarchical coding shows that if the EQTV signal is coded first and the HDTV signal is coded next, it is possible to obtain two optimally coded signal. This is realized in the first hierarchical coding scheme: the refinement system. An alternative for the refinement system is the selection system, which optimally codes the HDTV signal only, but has a simpler coding structure. The higher complexity of the refinement system results in higher-quality EQTV. >
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