A digital audio signal transmission system, in which high-quality digital audio signals are multiplexed in the video carrier by using an quadrature modulation method, is proposed. The channel coding method has been studied. Considering compatibility with the NTSC system, the dicode is the most suitable. Regarding the quality of multiplexed signal in a new quadrature modulation receiver, the partial response class 4 is advantagious. By employing the dicode as the transmission channel coding and by converting the received signal into the partial response class 4 after I+D processing, a new receiver system with an excellent performance has been proposed.
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