Boots – shoes – and leggings
Patent
1988-03-07
1990-02-13
Gruber, Felix D.
Boots, shoes, and leggings
324 77B, 328133, 364484, G01R 2500, G01R 2300
Patent
active
049012444
ABSTRACT:
The spectral components of both an original signal and a shifted version of the signal, for example a signal which is subjected to a time delay relative to the original signal, are obtained by means of Fourier Transform. This gives sets of first and second spectral components corresponding respectively to the original signal and the shifted signal. The phases of at least one pair of corresponding first and second spectral components are obtained, and subtracted to give a phase difference. The first aspect of the method measures the frequency of corresponding constituent of the original signal from the said phase difference based on a prior knowledge of the amount of shift. Further, having measured the frequency, one can measure the initial phase and amplitude of corresponding constituent of the signal. A second aspect of the method and an apparatus measure the amount of shift between two received signals from the said phase difference by means of a prior knowledge of the frequency of corresponding constituent of the signal. A third aspect of the method and an apparatus detect the existence of dominant constituent of the signal. This approach compares the difference in phases between adjacent spectral components of a signal with a constant value, (1-1/N).pi.. The measured signals can vary temporally or spatially.
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