The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 07, 1997
Filed:
Mar. 31, 1994
Paul F Sullivan, Westwood, MA (US);
Polaroid Corporation, Cambridge, MA (US);
Abstract
An adaptive predictor for use with a control system to predict error contributions due to harmonic distortion in a error signal such that the prediction signal may be fed back and added to the error signal to compensate for the harmonic distortion. The adaptive predictor takes the error signal representative of misposition error and performs a discrete Fourier analysis to determine contributions due to individual harmonics. It then adjusts the results and tallies a running total thereby adapting to a mechanical system in which it is contained. The running total is combined with a carrier signal which is clocked to produce a predictive signal representing harmonic distortion at a given time. The predictive signal is then added back with the original error signal to produce a harmonic distortion compensated signal.