Patent ID: 6956505
Filing Date: 2005-10-18
Classification: H03M

Abstract:
1. A signal processing apparatus for an encoder, comprising: position data acquiring means for sampling analog signals cyclically generated from an encoder coupled to an object to be measured with every given time in response to movement of said object to be measured and detecting and acquiring position data for said encoder; storage means for obtaining error data corresponding to a plurality of detected position data from the individual detected position data and ideal position data obtained on the supposition that the position data linearly changes within each period of said analog signal and storing the detected position data and the error data as reference data; and correction means for obtaining detection error data by using the reference data stored in said storage means for the detected position data acquired by said position data acquiring means, thereby correcting the detected position data with use of the obtained detection error data, wherein said correction means obtains a detection error corresponding to the detected position data acquired by said position data acquiring means by interpolating the reference data stored in said storage means.