Patent ID: 7123175
Filing Date: 2006-10-17
Classification: G01D,H03M

Abstract:
1. An angle detection signal processing apparatus for acquiring information of a first angle based on a detection output of a resolver including a first angle detection signal containing an amplitude of a first excitation signal having a first frequency modulated by a signal of a cosine function having a first angle and a second angle detection signal comprised of an amplitude of a second excitation signal having the first frequency modulated by a signal of a sine function having the first angle, said apparatus comprising: a signal processing unit outputting a first signal and a second signal having the first frequency and, at the same time, having a phase difference in accordance with the first angle based on the first angle detection signal and the second angle detection signal, a first phase lock unit generating a first phase locked signal locking the phase to the first signal and outputting first data indicating a phase angle of the first phase locked signal; a second phase lock unit generating a second phase locked signal locking the phase to the second signal and outputting second data indicating a phase angle of the second phase locked signal; and a phase difference computation unit computing a phase difference between the first phase locked signal and the second phase locked signal based on the first data and the second data.