Analog scrambling with continuous synchronization

Details Analog scrambling with continuous synchronization Analog scrambling with continuous synchronization

1993-03-01

1994-01-11

Cain, David C.

Cryptography

Key management

Having particular key generator

380 19, 375 94, H04L 900

Patent

active

052789071

ABSTRACT:
A device and method for scrambling and de-scrambling audio and voice communications including radio, cellular telephone, and conventional telephone communication. The audio communication can be scrambled using, for example, time varying pseudo-random spectral modification. Continuous data containing synchronization information is transmitted with the scrambled signal to eliminate time lags that occur with synchronization bursts and without detrimentally affecting audio quality.

REFERENCES:
patent: 5220584 (1993-06-01), Burns
T. E. Mailey, "How Scramblers Protect Mobile Communications", Cellular & Mobile International, Spring 1992.
E. F. Johnson Company, "Multi-Net Application Note", 1991.
Motorola Semiconductor Technical Data, "Technical Summary 8-Bit Microcontroller Unit", Motorola, Inc. 1989.
D. J. McKernan and Bill Scott, "A Rolling Code Scrambler Gathers Diverse Functions", Mobile Radio Technology, Jul., 1989.
Steve Kelley and Hank Wallace, "Split-band Scrambling Furnishes Voice Security", Mobile Radio Technology, 1988.

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