The paper describes a new proposal for burying a high data-rate data channel (with up to 360 kbit/s or more) compatibly within the data stream of an audio CD without significant impairment of existing CD performance. The new data channel may be used for high-quality data-reduced related audio channels, or even for data-compressed video or computer data, while retaining compatibility with existing audio CD players. The theory of the new channel coding technique is described.
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https://aes2.org/publications/elibrary-page/?id=6608
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