This paper describes a new TV datacasting system for digital data broadcast, referred to as S-Channel, using digital modulation over the TV first audio subcarrier in Korea. The system is designed to achieve high capacity communication rates over the TV channel. I examine research and development results pertaining to a new method for on-carrier TV datacasting using the main audio subcarrier. I call it the "S-Channel" system. Interference with other stations is not an issue because it operates within the occupied bandwidth limitations of TV stations. It also does not impact video, the first audio, the second audio or VBI portions of the existing television signal. I conclude that the new TV datacasting method offers capabilities similar to those offered by proposed datacasting like Wavephore's TVT1/4 or Digiteck's D-channel while maintaining full compliance with current broadcast regulations.
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