Communications: electrical – Continuously variable indicating – With meter reading
Patent
1986-03-04
1988-12-06
Yusko, Donald J.
Communications: electrical
Continuously variable indicating
With meter reading
358147, 70124, H04Q 904, H04N 708
Patent
active
047898607
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)).
REFERENCES:
patent: 4086534 (1978-04-01), Olson
patent: 4322854 (1982-03-01), Bundens et al.
patent: 4553161 (1985-11-01), Citta
patent: 4583232 (1986-04-01), Howell
patent: 4639933 (1987-01-01), Howell et al.
patent: 4658294 (1987-04-01), Park
European Broadcasting Union Documents, "Television Standards for the Broadcasting Satellite Service-Specification of the C-MAC/Packet System"-SPB 284, 3rd revision, Dec. 1984.
"Methods of Conveying C-MAC/Packet signals in Small and Large Community Antenna and Cable Network Installations"-SPB352, Dec. 1984.
Brennand Peter R.
Murray Bruce
U.S. Philips Corp.
Yusko Donald J.
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