Design of an HDTV subband codec considering CMOS-VLSI constraints
Ulrike Pestel-Schiller, Bernd Schmale · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 1990
A coding technique for the transmission of HDTV signals at a bit rate of 140 Mbit/s is presented. Since the capability of downward compatibility to standard TV is desired a four band subband approach has been taken. Because of the intended realization of the codec using CMOS-VLSI technology, the subband filter bank and the coding algorithm are designed considering hardware constraints and system restrictions of the subband filterbank. The design results in Quadrature Mirror Filters realizable with simple integer arithmetic. An adaptive intrafield coding algorithm is used for coding the four subbands. Separable QMFs with 10 coefficients in vertical and 14 coefficients in horizontal filtering are preferred to QMFs with less coefficients because of the coding gain.