Methods and apparatus for analyzing periodic waveforms

Details Methods and apparatus for analyzing periodic waveforms Methods and apparatus for analyzing periodic waveforms

1980-02-06

1981-11-17

Tokar, Michael J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Analysis of complex waves

364484, G01R 2316

Patent

active

043014046

ABSTRACT:
A waveform to be analyzed is repetitively sampled at corresponding instants in each of several cycles, and the samples from each cycle for a respective instant summed to derive an average value for that instant in one cycle of the waveform. The average values are then used for Fourier transform analysis, either by mathematical manipulation or by sequential correlation. The timing of the samples is determined by counting pulses from a high-frequency clock for one cycle of the waveform, truncating the count to remove the n least significant digits, and taking a sample every time a number of pulses equal to the truncated count has occurred (resulting in 2.sup.n samples per cycle for a modulo 2 counter).

REFERENCES:
patent: 3778606 (1973-12-01), Schmitt
B. S. Perlman and V. H. Auerbach, "Phase-Locking Technique for Estimating the Ensemble Average of Time Series Data", IEEE Transactions on Acoustics, Speech, and Signal Processing, vol. ASSP-25, No. 4, Aug. 1977, pp. 295-299.

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