Subjective Evaluation of Multi-Channel Stereophony for HDTV

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 use four sound signals in order to reproduce a better sensation of reality, (2) it is desirable to use three sound signals in front of observers and one sound signal at the rear of observers in order to maintain a better correspondence between the picture direction and the sound localization.