Encryption/decryption process and apparatus for a multichannel television system
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United States of America Patent
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-
Jan 30, 1996
Issued Date -
N/A
app pub date -
Oct 28, 1994
filing date -
Jul 12, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An encryption/decryption system which facilitates simultaneous decryption of multiple encrypted television signals thus making them simultaneously available for direct tuning in television receivers. The system is characterized by the utilization of a plurality of channel signals each containing picture portions and synchronization portions respectively corresponding to the picture components and synchronization components of a different video signal. Corresponding portions of all channel signals are time synchronized with respect to a common timing reference signal. Each channel signal is encrypted in accordance with a predetermined encoding rule and distributed to subscriber sites where the channel signals are made simultaneously available for viewing by decrypting them synchronously with the recovered timing reference signal in accordance with the inverse of the encoding rule.
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