Listening conditions in a future HDTV system will differ from those at present. High Definition Television means a changed distance between the television set and the observer, probably another format of the picture, in any case an extended angle of vision. at least 33° (distance 3 x height, 3/5 format). These will cause head movement of the spectator (listener) and, if more than one person takes part, sitting side by side naturally. This is contradictory to reception of stable phantom sources normally used in stereophony. To overcome this problem so-called substituting sound sources can be applied, to convey correct localization of directions. This system will make use of five separated sound channels which must be available as well as for recording, storing, transmission, and reproduction. Compatibility with existing monophonic or stereophonic systems can be achieved by simple matrixing networks.
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