Noise source for transfer function testing

Details Noise source for transfer function testing Noise source for transfer function testing

1975-03-06

1976-10-26

Krawczewicz, Stanley T.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324 77B, 325363, 331 78, G01R 2700

Patent

active

039886670

ABSTRACT:
A method and apparatus for obtaining an accurate measure of a transfer function of either a linear or the linear part of a nonlinear system. This is accomplished by utilizing an estimation technique using a "periodic-random" stimulus consisting of a random stimulus of a finite record length that is repeatedly applied to the system under test until the stimulus and the system response become essentially periodic. Once periodicity is achieved within the desired accuracy, a first estimate of the transfer function is derived from the measured spectrums of the stimulus and the system response. Another "periodic-random" stimulus, uncorrelated with prior records, is then generated and the above procedure is repeated to achieve an average value of the transfer function within the desired accuracy. Through the use of several "periodic-random" stimuli, leakage and distortion in the measurement is minimized, thus greatly improving the accuracy of the estimation technique in measuring the transfer function of the system under test.

REFERENCES:
patent: 3072845 (1963-01-01), Bruck
patent: 3573652 (1971-04-01), Charters
patent: 3821648 (1974-06-01), Campbell
patent: 3886451 (1975-05-01), Chu et al.
Wilkins, A Low Frequency Random Step Generator, Electronic Engineering, June 1964, pp. 386-389.

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