Oak Industries, Inc.

Terry L Nimmer

Richard C Gall

Stanley E Guif

Donald A Weigt

Glenn Wolenec

A subscription TV decoder for processing encoded audio and video signals in which the TV program audio information is received as an audio subcarrier includes means for decoding the video signal, a filter for separating the decoded video and audio signals, and a filter for separating the audio signal from the audio information subcarrier. The audio information subcarrier is multiplied to raise it to the frequency of the audio signal and is then recombined with the decoded video signal.

Subscription TV audio carrier recovery system

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 portions 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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Madison, WI, United States of America

Terry L Nimmer