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A h.mact -The design of advanced television systems requires careful consideration on a multitude of levels. The basic parameters of concern must be fairly defi ned for comparison of all potential proposals. Trade· olfs in the form of b�ndwidth reduction should then closely match the properties of the human visual system, and the characteristics and statistics of studio source material. A discussion of these parameters and their tradeoffs is presented indicating the obvious need for bandwidth reduction in order to accommodate present-day transmission cbannels.The compression scheme of the HDS/NA system which exploits these tradeoffs is discussed. A method for delivery of HDTV via satellite is detailed followed by a presentation of a simulcast technique for trans· mission of HDTV in a terrestrial environment. Interference issues are of primary concern when utilizing a tahoo channel for terrestrial broad cast, and techniques for minimizing their effects, exploited in HDS/NA are discussed.

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