Process and circuit layout for the recognition of an identification sign (signum) contained in a video signal
US4907269A · kind A · utility
20Cited by
3References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 29, 1988 |
| Grant date | Mar 6, 1990 |
| Priority date | — |
| Expiry date | Sep 29, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N7/1675
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Circuitry for recognizing an authorization code included in a video signal for enabling a subscriber's television receiver, includes quantizing apparatus for coarsely quantizing the received signal. A correlator designed to recognize the authorization code is coupled the quantizer and produces an array of correlation values. The correlation values are coupled to a threshold circuit which converts the correlation values to bistate values. Further circuitry evaluates the distribution of bistate values to determine reception of the authorization code.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.