Patent Document ID: 8375076
Application ID: 12540802
Patent Status: 1

Claim One:
1. Method for determining an angle using a resolver having an input for an excitation signal and at least two outputs for response signals, the method comprising: supplying an excitation signal of essentially constant frequency to the resolver; measuring the resolver response signals at a measurement interval; first computing Finite Impulse Response (FIR) filtering for computation points representing the measured response signal values at each measurement interval; storing the first computation points and a set of corresponding computation result values calculated by said first computing in memory; shifting each of said first computation points at least once relative to the excitation signal, storing the shifted computation points and a new set of values of computation results corresponding to the shifted computation points in memory; comparing at least two sets of values of computation results to each other and selecting a value set that includes the highest computation result as an unsigned value from among said at least two sets of values; second computing FIR filtering at predetermined computation points corresponding to the selected value set; determining angle data from results of said second computing; and synchronizing each of said predetermined computation points with the excitation signal by defining a frequency of computations as the excitation signal frequency or as a multiple of the excitation signal frequency.