Digital amplitude estimator

Details Digital amplitude estimator Digital amplitude estimator

1992-12-31

1994-12-27

Malzann, David H.

Boots, shoes, and leggings

G06F 1531

Patent

active

053771311

ABSTRACT:
Amplitude information is derived from a periodic waveform by digitally sampling the periodic waveform, filtering a digital harmonic signal out of the digital sample sequence of the periodic waveform, and computing the root mean square of the digital Mth harmonic signal over a predetermined number of successive samplings of the periodic waveform. The digital sampling is done at a rate such that there will be an integer number of samples "L" over the period of the first harmonic component of the digital sample sequence of the waveform signal. The root mean square value computation is simplified by selecting the sampling window width N and the harmonic M so that there is a predetermined relationship to a critical sampling number L given by the expression, L=(4MN)/(2j+1) where j=0, 1, 2, . . . . As long as this relationship is satisfied, the RMS value can be computed by summing the absolute value of selected digital amplitude values of the selected harmonic component of the digitized signal. Further, the RMS values may be averaged by nesting a number of successive indexed RMS value computations.

REFERENCES:
patent: 4679103 (1987-07-01), Workman
patent: 4707841 (1987-11-01), Yen et al.
patent: 4907107 (1990-03-01), Sakurai
patent: 4931887 (1990-06-01), Hedge et al.
patent: 5293369 (1994-03-01), Melas et al.

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