Abstract
This paper investigates a subband coding scheme to reduce the transmission bandwidth of the digitized high-definition television (HDTV) images. The HDTV signals are decomposed into seven bands. Each band is then independently encoded. The base band is DPCM encoded and the high bands are encoded by using nonunif orm Laplacian quantizers with a dead zone. By selecting the dead zone on the basis of energy in the high bands, an acceptable image quality is achieved at an average rate of 45 Mbits/s (Mbps). This rate is comparable to some very hardware intensive schemes of transform compression or vector quantization proposed in the literature. The subband coding scheme used in this study is considered to be of medium complexity. The 45-Mbps rate is suitable for transmission of HDTV signals via satellites.
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