H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/30
H04N 7/16 (2006.01) H04N 7/167 (2006.01)
Patent
CA 1261961
PAY TV SCRAMBLING BY AUDIO ENCRYPTION Abstract of the Disclosure A subscription television distribution system pro- vides a plurality of sources of television program channels, each of which include a video signal and an encrypted audio signal with the encrypted audio signal including encrypted control and subscriber address data. There is a communication link connecting the plurality of sources with at least one receiving site such as a cable system head and which has means fox receiving the plurality of television channels. At the receiving site, the encrypted audio signals are separated from the television channel and are multiplexed together on an non-television channel carrier. An identifying tag is added to each of the video signals for use in subsequently selecting the audio signal corresponding to its associated video signal when the encrypted audio signals are demultiplexed at sub- scriber locations. At each subscriber there is a TV audio decrypter which selects the tag from a video signal and uses that tag to demultiplex a particular audio signal. The audio signal is then decrypted and is combined with the video signal to provide program information for the subscriber.
538744
Oak Industries Inc.
Riches Mckenzie & Herbert Llp
LandOfFree
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