Interface between a receiver and a sub-system
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United States of America Patent
Stats
-
Dec 6, 1988
Grant Date -
N/A
app pub date -
Mar 4, 1986
filing date -
Mar 12, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
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)).
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