Cable television master/slave decoder control

Details Cable television master/slave decoder control Cable television master/slave decoder control

1985-05-06

1986-12-30

Buczinski, Stephen C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 86, 358114, H04N 7167

Patent

active

046333096

ABSTRACT:
A method of controlling the operation of slave decoders in a cable television distribution system having a central control computer; in which each subscriber location having a slave decoder also has a master decoder; in which there is a control message connection between each master decoder and its associated slave decoder(s); and in which the central control computer can individually address each master decoder and each slave decoder. The method includes the steps of transmitting control messages for the slave decoders at the control message frequency for the master decoders. In response thereto, each master decoder will retransmit the control message to its associated slave decoders. Periodically, the central control computer sends deauthorize messages addressed to all slave decoders as a group; however, the deauthorization messages are preceded by an inhibit message addressed to all master decoders, thereby preventing the retransmission of the slave decoder deauthorization message to all slave decoders which are connected to a master decoder.

REFERENCES:
patent: 4450481 (1984-05-01), Dickinson
patent: 4475123 (1984-10-01), Dumbauld et al.
patent: 4520508 (1985-05-01), Reichert
patent: 4530008 (1985-07-01), McVoy
patent: 4574305 (1986-03-01), Campbell et al.

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