Apparatus for scanning variable area optical sound tracks by parallel processing discrete photosensor outputs
US4355383A · kind A · utility
21Cited by
5References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 28, 1980 |
| Grant date | Oct 19, 1982 |
| Priority date | — |
| Expiry date | May 28, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B23/0007
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Apparatus for scanning variable area optical sound tracks wherein a plurality of discrete photo sensors examine small fractional portions of the sound track width. Selection of the number of sensors in relation to photographic grain dimensions results in converting annoying quantizing noise to more tolerable random noise while using a practical number of sensors. Electronic processing of the sensors' outputs reduces impulse noise from dirt and scratches.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.