Although FM subcarriers have been in use for years for Television Sound, the new era of Multi-Channel Sound can be better implemented Digitally. This paper examines the fundamentals of FM Audio and the extraordinary Digital Audio; and the viability of using the exciting Digital Technology for the upcoming world of Stereo TV Sound. Existing Digital TV Sound system in the Public Broadcasting Service (PBS) is reviewed, along with other state-of-the-art implementations of Digital Audio. Two important concepts are discussed: Time-Division Multiplex (TDM), and Frequency-Division Multiplex (FDM), and their respective system designs. For network distributions, compatibility to the AT&T Digital Cross Connect System is an important factor in planning the FDM system, leading to several possible Digital formats. These designs will be presented.
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