Interface between a receiver and a sub-system
US4789860A · kind A · utility
15Cited by
6References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 4, 1986 |
| Grant date | Dec 6, 1988 |
| Priority date | — |
| Expiry date | Mar 4, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T70/5296
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An interface arrangement between a television receiver (1) and a conditional access sub-system (3), in particular for MAC type television signals comprises a bus having a first line (CKFH) conveying clock signals at television line frequency, a second line (DATA) conveying data during prescribed periods in a four television frame period bus cycle and a third line (DIRN) conveying a signal indicating the direction of data travel on the second line. The bus may be connected to a number of sub-systems (3(1), 3(2)) internal to the television receiver or may be connected via a connector unit (7) to external sub-systems (5(1), 5( 2)).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.