Digital on video recording and playback system
US4419699A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 16, 1981 |
| Grant date | Dec 6, 1983 |
| Priority date | — |
| Expiry date | Nov 16, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/20
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a system for recording digital information on a video disc and for playback of the digital information therefrom, the digital data is recorded in synchronism with the color subcarrier signal on a horizontal line adjacent to a constant luminance line. This arrangement facilitates a video disc player having a simple, efficient, video-to-digital interface for separating the prerecorded digital information from the video signal. The player apparatus is responsive to the color subcarrier signal and the chrominance-related output signal of a comb filter, both of which are normally available during video signal processing. Prerecorded digital information representing field number and type of program content is used by a microprocessor controller to provide player features such as locked groove detection, program elapsed time display, and end of program indication. The microprocessor-to-player interface includes means responsive to the panel controls to operate the player mechanism and panel displays in accordance with the desired player features.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.