Bit-rate reduction method "HE-TCM"is described for high-definition television signals using Time Compression Multiplexing (TCM) and adaptive subsampling. Newly proposed adaptive subsampling method optimally applies four modes, corresponding to input video characteristics. This is applicable to an 8 MHz analog transmission system for HDTV signals, also compatible with 100 Mb/s transmission using intraframe DPCM. Simulation results show that the proposed method is superior to the method using non-adaptive quincunx subsampling not only in moving picture quality, but also naturalness and smoothness of picture.
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