Optical reading device for reading an information carrier with motion effect facilities
US4460927A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 28, 1977 |
| Grant date | Jul 17, 1984 |
| Priority date | — |
| Expiry date | Dec 28, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/2587
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The invention relates to optical reading of a track in a spiral or concentric circles, carried by an information substrate, usually a disc, television signals being recorded along the track. The reading device includes a device for generating track jump pulses in which bits written at the top of pairs of adjacent fields in order to determine whether the fields being read belongs or does not belong to the same frame so that jump control pulses are generated when the bits are found to be identical. The invention is of use inter alia for reading television signals recorded on video-disc and obtained by analyzing film frames particularly to bring about a stop at a frame by jumping a track, either when frames are analyzed in two tracks or in the case of analysis in the sequence 2, 3, 2, 3 etc. . . .
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.