Scrambling system for television sound signals
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United States of America Patent
Stats
-
May 5, 1981
Grant Date -
N/A
app pub date -
Apr 25, 1979
filing date -
Apr 25, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An audio scrambler operates on segments of audio divided from a continuous audio signal to rotate head-to-tail the string of information contained in the segment by an amount which is at pseudo-random between the successive segments. When the segments are compressed to video format, the scrambled compressed audio signals are inserted into an unused line of the vertical blanking space of a television system for transmission with the video signals. The inserted audio is combined with decoy signals, also in the vertical blanking space to increase security of transmission. Concurrent scrambling of compressed audio signals and video signals is provided.
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