In order to develop sound systems for HDTV, experiments were carried out with seven sound reproduction systems to assess their sensation of reality, sound spaciousness, and other qualities. The results suggest that 1) it is desirable to make use of four sound signals in order to reproduce a better sensation of reality, 2) it is desirable to make use of three sound signals in front of viewers and one sound signal at the rear of viewers in order to maintain a better correspondence between the picture and the sound localization.
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