Encoding and decoding of digital recordings
US4297729A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 20, 1978 |
| Grant date | Oct 27, 1981 |
| Priority date | — |
| Expiry date | Nov 20, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B20/1419
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In television games programs may be stored on tape, disc or similar to change a basic games unit to different games or other entertainment or instruction. The data is transferred from the recording medium to a processor and clocked in at a suitable rate. The invention provides generation of clock pulses using two counters. The arrangement generates clock pulses at a predetermined position of data 1's but for 0's it generates clock pulses a predetermined interval after the preceding pulse. An arrangement is provided recording staggered data on two tracks of a tape to counter drop outs and a watermark code is provided to guard against use of unauthorized programs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.