Analog signal scrambling system
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United States of America Patent
Stats
-
Apr 5, 1983
Grant Date -
N/A
app pub date -
Jun 22, 1979
filing date -
Jun 22, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A speech scrambling system using discrete prolate spheroidal sequence coefficients (PC). The problem is to provide high fidelity and high security in a scrambling system while limiting the bandwidth of the scrambled signal to the bandwidth of the original speech signal. The disclosed system uses PC to solve this problem. The analog speech signal is digitally sampled (100), converted to PC (203, 204, 205), scrambled (208, 209), and converted to scrambled samples (211, 212, 213). The scrambled samples are transmitted using pulse amplitude modulation (102) in the same bandwidth as the original signal. At the receiving end, the inverse steps are performed to recover the original speech. The scrambling is periodically modified (220, 320) to improve security.
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