Analog privacy scrambler and scrambling method

Details Analog privacy scrambler and scrambling method Analog privacy scrambler and scrambling method

2005-11-01

2005-11-01

Barrón, Jr., Gilberto (Department: 2132)

Cryptography

Communication system using cryptography

Speech scrambler detail

C380S253000, C380S266000

Reexamination Certificate

active

06961431

ABSTRACT:
A system and method for maintaining privacy in transmission of a high bandwidth analog signal. A preferred system and method breaks an input signal into bands and then uses Walsh codes to overlay many signals on top of each other with a set of phase modulators to establish scrambling of the input signal. The scrambled signal is then transmitted. The received scrambled signal has the phase modulation removed and an inverse Walsh transform recovers the original bands. The recovered bands are added together to recover the original signal. The system and method use techniques that establish synchronization and phase coherency complete the process.

REFERENCES:
patent: 4516079 (1985-05-01), York
patent: 5218619 (1993-06-01), Dent
patent: 5742679 (1998-04-01), Olafsson
patent: 6175551 (2001-01-01), Awater et al.

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