Variable starting state scrambling circuit
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United States of America Patent
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-
Mar 7, 1989
Issued Date -
N/A
app pub date -
Nov 10, 1987
filing date -
Jul 28, 1982
priority date (Note) -
Expired
status (Latency Note)
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Abstract
PN sequence generators used in the scrambling and descrambling circuits at remote locations are periodically preset to the same value in order to maintain synchronism, with the preset value being also periodically changed. The preset value can be transmitted to the scrambling and descrambling circuits over a privacy channel once per frame and stored in storage registers associated with each of the scrambling and descrambling circuits. The stored starting state values can be loaded into the PN sequence generators as often is desired to maintain proper synchronization, with the stored values themselves being changed at a rate in accordance with the desired degree of security.
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