Via such systems as the BBC's NICAM and the German dual-carrier FM sound systems, listeners to television have been able to receive Dolby Stereo, a surround sound service common to movie-house and home-theater audiences. Evidence exists that an increasing number of television listeners are now equipping themselves with the appropriate decoding equipment, such as a Pro Logic decoder, to enable them to listen in surround sound. Thus any move by television companies to digital terrestrial (or nonterrestrial) television broadcasting that uses bit-rate-reduction technologies must consider the wishes of this section of their audience. The options for broadcasting Dolby Stereo via MPEG coding are considered as an initial route to providing surround sound services. Although for convenience the study was written specifically in the context of the Dolby Stereo system, much of what is stated is equally applicable to other two-channel-based sound systems, such as Sensora Sound, Ambisonics, Circle Surround, and others.
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