Patent ID: 6484120
Filing Date: 2002-11-19
Classification: G01D

Abstract:
A position detection data generating method for use in a position detection system which produces a first A.C. output signal having an electric phase angle shifted in a positive direction in accordance with a position-to-bedetected and a second A.C. output signal having an electric phase angle shifted in a negative direction, said position detection data generating method comprising:a first step of generating first detection data by detecting a phase difference of said first A.C. output signal from a predetermined reference phase and generating second detection data by detecting a phase difference of said second A.C. output signal from the predetermined reference phase; a second step of providing a first predicted value on the basis of at least two samples of said first detection data and providing a second predicted value on the basis of at least two samples of said second detection data; a third step of providing at least one standard predicted value on the basis of said first and second predicted values; a fourth step of performing interpolation on said first detection data and said second detection data, sequentially with passage of time, using the standard predicted value, to thereby provide first interpolated detection data and second interpolated detection data; and a fifth step of, on the basis of said first and second interpolated detection data, outputting position detection data corresponding to the position-to-bedetected.