STEREOPHONIC MOTION PICTURE PHOTOGRAPHIC SOUND-TRACKS AND APPARATUS FOR RECORDING AND PLAYING BACK PHOTOGRAPHIC SOUND TRACKS

摘要

Discrete four-channel photographic (optical) motion picture sound-tracks are disclosed that are compatible with existing monophonic and stereo variable area (SVA) theatre projection equipment. Six track and four track embodiments are disclosed. In the four track embodiments 4-4-4 matrix encoding is employed in producing the sound-track. Apparatus for recording and reproducing the compatible four-channel sound-tracks are also disclosed.