Coding of advanced TV for BISDN using multiple subbands

A subband-based coding scheme for the digital transmission of advanced television (ATV) signals within broadband ISDN (BISDN) is described. It is intended for the delivery of high-quality video to the home or office at the CCITT recommended H4 rate of roughly 130 Mb/s. The scheme uses intrafield processing only, resulting in relatively low complexity for hardware implementation, very desirable error propagation properties and the elimination of motion-related artifacts. The use of the shortest kernal (two-tap) quadrature mirror filter (QMF) pairs for signal decomposition and reconstruction minimizes quantization noise spread and further reduces complexity. Through successive QMF operations, the signal is decomposed into six bands to achieve low noise coding not normally associated with the shortest kernal implementations. In effect, the coding scheme is identical to a Hadamard transform (HT) with nonconstant block sizes. When combined with entropy coding, this approach achieves the roughly 5.6:1 compression desired while retaining very high image quality.<
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