Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Analysis of complex waves
Patent
1993-06-23
1995-07-04
Gregory:, Bernarr
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Analysis of complex waves
327 51, G01R 1900
Patent
active
H00014583
ABSTRACT:
A signal amplitude distribution analyzer measures the amplitude probability density function of electrical signals, and in particular, the amplitude probability distribution of noise signals. Such measurements may be used to determine the "Gaussianicity" of noise signals, that is, a measurement of how closely the amplitude distribution of noise signals corresponds to theoretical values derived from the Gaussian probability distribution density function. This theoretical density function represents the relative percentage of time that a noise signal is at a given amplitude. The invention gives an approximation of this function by measuring the amount of time a noise signal is between a window of two adjustable voltage levels. This is accomplished by producing an output voltage proportional to the amount of time a noise signal amplitude falls within the window of values defined by the two adjustable voltage levels. The center point of this window is then plotted versus the invention's output voltage, giving the amplitude distribution density. This is then compared to the theoretical density function, plotted on the same graph, to determine signal "Gaussianicity." The invention is calibrated to give an output that is Gaussian when analyzing a known Gaussian input. A continuous resolution measurement of the signal amplitude probability density function is possible, permitting accurate analysis of noise statistics in terms of skewness, clipping, etc. The cumulative amplitude distribution of noise signals can also be measured by the analyzer of the invention.
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S. R. Michaels, "Test Whether a Noise Source is Gaussian", EDN, 11 Dec. 1, pp. 272-274.
Fendelman Harvey
Gregory: Bernarr
Keough Thomas Glenn
Lipovsky Peter A.
The United States of America as represented by the Secretary of
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