Variable time inversion algorithm controlled system for multi-level speech security
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United States of America Patent
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Jun 26, 1990
Issued Date -
N/A
app pub date -
May 1, 1989
filing date -
Mar 27, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method for scrambling speech such as in a mobile land based communication system is disclosed. Essentially, variable length time samples of digitized speech are stored and time inversion scrambled. The scrambled speech is converted back to analog form and transmitted to a receiver which reciprocates the process to reproduce the desired speech signals. Scrambling and descrambling of the speech signal is synchronized to provide corresponding sample time inversions and accurate reproduction of the speech input signal. The level of security afforded by the scrambling method may be varied by varying the length of the sampling period or by mixing forward and reverse time samples under control of an algorithm.
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