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Browse Prior Art Database

Simulation of a Random Signal With a Given Spectrum

IP.com Disclosure Number: IPCOM000075255D
Original Publication Date: 1971-Aug-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Croiser, A: AUTHOR

Abstract

This technique permits the build-up of pseudo-random signal with a given spectrum, by means of a computer.

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This is the abbreviated version, containing approximately 100% of the total text.

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Simulation of a Random Signal With a Given Spectrum

This technique permits the build-up of pseudo-random signal with a given spectrum, by means of a computer.

A shift register N-stages long, fed by the output of an XOR whose inputs are the Pth and the Kth stage of the shift register, delivers a signal which does not contain any periodic component as long as it lasts less than T sec, where T is equal to 2/N-1/ multiplied by the clock period of the shift register. The output is D/A converted and filtered by a band-pass filter to obtain a signal whose spectrum has the desired shape.

Then the signal T sec long is PCM encoded and stored in the memory of the computer. The previous processing is completed off-line. The digital generation is achieved by reading the successive samples as many times as it is necessary. Should the receiver perform Fourier analysis on a time interval smaller than T, it would not detect any periodic component.

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