Boots – shoes – and leggings
Patent
1994-05-18
1996-11-19
Trammell, James P.
Boots, shoes, and leggings
364485, 364577, 364726, 36472406, 324 7619, 324 7621, G01R 2300, G01R 2316, G06F 1710, G06G 730
Patent
active
055769780
ABSTRACT:
A high resolution frequency analyzer analyzes frequency spectra of an incoming analog signal based on a fast Fourier transformer at ultra-high resolution without increasing the sampling number or time data of the analog signal. This series of input time data representing the analog signal is provided to the fast Fourier transformer through a subtractor. The analyzer distinguishes a spread spectrum, due to fluctuations, from a true line spectrum in the frequency spectra output by the fast Fourier transformer. If the spectrum is found to be the true line spectrum, then true frequency, amplitude and phase of the line spectrum are accurately obtained by an interpolator. The line spectrum is accumulated by an accumulator and inversely converted by an inverse Fourier transformer provided in a feedback loop so as to feedback time base data to the subtractor. The time base data is subtracted by the input time data so that the remainder data is Fourier transformed. The line spectrum accumulated by the accumulator is vector-added to the output of the fast Fourier transformer, which establishes a high resolution frequency spectrum to be displayed on a display device.
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Advantest Corporation
Trammell James P.
Vo Hien X.
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