Precision phase controlled clock for sampling television signals
US4122487A · kind A · utility
16Cited by
1References
25Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 28, 1977 |
| Grant date | Oct 24, 1978 |
| Priority date | — |
| Expiry date | Jan 28, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/20
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus is disclosed for sampling an analog information signal having an associated carrier signal at precise phase positions with respect to said carrier, which involves sampling the information signal at predetermined phase positions relative to the carrier signal using a phase locked loop to maintain the sampling positions reasonably close to the predetermined phase positions and thereafter examining the discrete samples and generating an error signal that indicates any phase deviation and adjusting the sampling so that the error signal approaches zero and the samples are taken at said precise phase positions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.