Photoreceptor matrix for optical video playback system
US4001494A · kind A · utility
9Cited by
5References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 1, 1974 |
| Grant date | Jan 4, 1977 |
| Priority date | — |
| Expiry date | Nov 1, 1994 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/08
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A matrix of four photoreceptors is arranged to develop output signals representing information stored in a video disc as well as error signals for maintaining proper tracking registration of the reading beam with the storage track of the disc. The matrix enables all four photoreceptors to contribute to the development of the output signals and permits separate treatment of high frequency and low frequency signal information for improved results with respect to response and signal-to-noise ratio.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.