Modulated sound reading system
US4085296A · kind A · utility
14Cited by
7References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 19, 1975 |
| Grant date | Apr 18, 1978 |
| Priority date | — |
| Expiry date | Dec 19, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B20/24
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A motion picture sound reading system employing a light emitting diode source which is modulated at a carrier frequency several times higher than the highest sound-track frequency for exciting the optical sound track and a carrier-demodulation signal processing system for deriving a high-quality audio signal from the photoelectrically detected optical sound track.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.