Pseudo-random signal synthesizer with smooth, flat power spectru

Details Pseudo-random signal synthesizer with smooth, flat power spectru Pseudo-random signal synthesizer with smooth, flat power spectru

1988-05-09

1995-07-25

Gregory, Bernarr E.

Cryptography

Key management

Having particular key generator

375200, 380 34, 364717, 331 78, H03B 2900, G06F 102

Patent

active

054369738

ABSTRACT:
Apparatus and a method are disclosed for synthesizing a pseudorandom communications signal having a smooth, flat, power spectrum. The system comprises frequency modulation circuitry for deriving a first analog signal from a digital encoding signal. The first analog signal is derived to have a substantially constant amplitude and a frequency varying in response to the amplitude of the digital encoding signal. Fourier transform circuitry is connected to the modulation circuitry and is operative to derive a second analog signal from the first analog signal. The resulting second analog signal is the fourier transform of the first analog signal, having a substantially constant power spectral density over the bandwidth of said second analog signal, and having an amplitude that varies in response to the amplitude of the digital encoding signal.

REFERENCES:
patent: 4396894 (1983-08-01), Willmore
patent: 4644299 (1987-02-01), Amoroso et al.
patent: 4961203 (1990-10-01), Maufe et al.

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