INTERPOLATION CIRCUIT OF ENCODER

摘要

An interpolation circuit of an encoder by which interpolation data within one wave are obtained from two sine-wave encoder signals having different phases, comprising an interpolation calculating means (2) to which the two sine-wave encoder signals are inputted and in which interpolation calculation within one wave is performed, a signal shift detecting means (3) which detects the shift between the two sine-wave encoder signals, a correction data generating means (4) which outputs correction data in accordance with the detected shift and the output of the interpolation calculating means, and a correction calculating means (5) which corrects the output of the interpolation calculating means by using the correction data to obtain corrected interpolation data.