Continuous motion flying spot telecine
US4268865A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 22, 1979 |
| Grant date | May 19, 1981 |
| Priority date | — |
| Expiry date | Oct 22, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/11
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
This invention concerns a continuous motion flying spot telecine apparatus of the kind comprising a cathode ray tube for effecting flying spot line-by-line scanning of each frame of a film during its motion through a scanning station, opto-electronic converter means for producing from the scanning of each film frame an analogue signal comprising a plurality of lines of which at least a part of each (the active part) contains picture information, an analogue-to-digital converter for sampling the analogue signal at a predetermined clock frequency, a filter for limiting the bandwidth of the analogue signal prior to sampling to avoid interference between the clock frequency and high frequencies in the analogue signal, a store for storing digital signals produced by the sampling, and means for reading out the stored digital signals in a predetermined sequence and at a predetermined rate. In order to permit scanning of different format films or only part of the film frame height without burning the c.r.t., the apparatus further comprises means for selectively changing the line frequency of scanning between at least two values. In order to avoid changing the clock frequency when changing …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.