Abstract
A digital audio signal-transmission system, in which high-quality digital stereo audio is multiplexed in the video carrier using a quadrature modulation method, is proposed. This system is fully compatible with the NTSC terrestrial television system and employs three new methods to improve compatibility with the existing NTSC system: dicode modulation, line interleaving, and line-comb filtering. Theoretical analysis and experiments show the feasibility of this transmission system at a data rate of 850 kbits/sec and a multiplexing level of—26 dB.
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