Surgery – Truss – Pad
Patent
1990-10-31
1993-02-23
Jaworski, Francis
Surgery
Truss
Pad
7386125, A61B 806
Patent
active
051881144
ABSTRACT:
In a technique for suppression of mirroring in a system which utilizes discrete Fourier transformation of an input signal, a correction apparatus adjusts the observed forward velocity spectrum by a first correction function and adjusts the observed reverse velocity spectrum by a second correction function to provide corrected velocity spectra. The first and second correction functions are representative of mismatches between the in-phase and quadrature channels of the signal processor. The correction functions are obtained during a calibration period in which calibration signals are applied to the signal processor. A first calibration signal contains frequencies of only forward velocities, and a second calibration signal conmtains frequencies representative of only reverse velocities. The correction functions are calculated from the spectra that were measured during calibration. In many cases, the first and second correction functions are the same.
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patent: 4607642 (1986-08-01), Powers
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patent: 4966153 (1990-10-01), Nakamura et al.
patent: 4995397 (1991-02-01), Nishiyama et al.
patent: 5048528 (1991-09-01), Superina et al.
Hasegawa Tomohiro
Smith Richard B.
Thiele Karl E.
Hewlett--Packard Company
Jaworski Francis
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