A 32 Mbit/s Component Separation DPCM Coding System for NTSC Color TV

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 <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">Y</tex> and two chrominance components <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">I</tex> and <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">Q</tex> . Then, these three components are converted into a TDM-PCM color signal, where <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">I</tex> and <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">Q</tex> of only odd lines are transmitted and samples in horizontal blanking intervals of <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">Y,I,</tex> and <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">Q</tex> 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 <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">Y</tex> signal, 4 bit and 8 bit code words are assigned to 29 quantizing levels. For both <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">I</tex> and <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">Q</tex> 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.