Stereophonic motion picture photographic sound-tracks compatible with different sound projection formats and record and playback apparatus therefore
US4577305A · kind A · utility
12Cited by
3References
21Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 14, 1983 |
| Grant date | Mar 18, 1986 |
| Priority date | — |
| Expiry date | Mar 14, 2003 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04S3/02
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.