Subscription tv decoder logic system

Details Subscription tv decoder logic system Subscription tv decoder logic system

H - Electricity

04

N

350/25

H04N 7/14 (2006.01) H04N 7/167 (2006.01)

Patent

CA 1120581

ABSTRACT OF THE DISCLOSURE A subscription TV decoder for processing encoded audio and video signals utilizes decoder enabling signals which are transmitted as audio subcarriers and have data and address por- tions thereof. The decoder includes audio and video decoder circuits and a decoder enabling circuit. The enabling circuit has address storage means and means for comparing the address portion of a received message with the stored address. There are means responsive to the address comparison means for storing the data portion of the message. The enabling message utilizes an address common to a plurality of subscribers and there are means responsive to a received enabling message for comparing the stored data with the enabling message data and to enable the audio and video decoder circuits in response to correspondence therebetween.

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