Boots – shoes – and leggings
Patent
1994-10-28
1997-03-11
Voeltz, Emanuel T.
Boots, shoes, and leggings
364577, 364484, 364485, 364487, 324 7619, 324 7621, 324 7638, 324608, G06G 719
Patent
active
056108478
ABSTRACT:
A ratiometric Fourier analyzer is provided for determining the frequency components of the output waveforms of electronic circuits by eliminating errors due to aliasing without increasing the time necessary for analysis. Ratiometric Fourier analyzers in accordance with the present invention detect values of an output waveform from a circuit simulator at time intervals selected according to features of the output waveform being analyzed. A functional representation of the output waveform over each interval is generated using a polynomial fit to the detected values of the waveform, and a Fourier integral for each frequency of interest is calculated for interval using the functional representation of the waveform. The Fourier integrals are then summed over the intervals of the output waveform to yield the Fourier coefficient at a given frequency for the output waveform. The accuracy and efficiency of the method are enhanced by employing polynomial fitting procedures to the same order in both the Fourier analyzer and the simulator and by selecting the sampling points of the Fourier analyzer at the same time steps used by the simulator to generate the output waveform. The RFA can be used to determine a small number of harmonics in a broadband signal without distortion due to aliasing.
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Cadence Design Systems Inc.
McNelis John T.
Novakoski Leo V.
Voeltz Emanuel T.
Wachsman Hal D.
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