Subscription television system

Details Subscription television system Subscription television system

1983-12-12

1986-03-25

Buczinski, S. C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358122, H04N 7173

Patent

active

045787034

ABSTRACT:
A wireless subscription television system arranged to transmit ciphered video signals from a transmitter to receivers in which the transmitting system comprises an enable code setting means, a transmitting means for transmitting control signals to allow a respective enable code of a receiving system to be picked up and a converting means for masking said enable codes and sending out masked enable codes, and on the other hand, the receiving system has a plurality of decoder systems each comprising a key code input means, a means for picking up a key code put in by the input means after converting it into an enable code by means of the control signals and a comparator means for determining if the picked-up enable code and the enable code as masked sent from the transmitting system are same or not. Thus, when the both enable codes come to be same, the respective decoder system is set in receivable condition.

REFERENCES:
patent: 4225884 (1980-09-01), Block et al.
patent: 4250524 (1981-02-01), Tomizawa
patent: 4338628 (1982-07-01), Payne et al.

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