Abstract
A component separation DPCM Coding system is described which is capable of transmitting a 4 MHz NTSC color TV signal with broadcast quality at a 32.064 Mbit/s rate. The input NTSC color TV signal is first separated into a luminance component Y and two chrominance components I and Q . Then, these three components are converted into a TDM-PCM color signal, where I and Q of only odd lines are transmitted and samples in horizontal blanking intervals of Y,I, and Q are removed, in order to reduce the transmission rate. This TDM-PCM signal is encoded by a single DPCM coder, which employs a two-dimensional prediction method and a dual word-length coding method. For the Y signal, 4 bit and 8 bit code words are assigned to 29 quantizing levels. For both I and Q signals, 3 bit and 6 bit code words are assigned to 13 quantizing levels. Coding experiment results show that this coding system is promising for application to broadcast color TV signal transmission at a 32.064 Mbit/s rate.
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