An offset error, an amplitude error, a phase error and a third harmonic component contained in two-phase sinusoidal signals are removed using relatively simple digital computations. An offset error contained in two-phase sinusoidal signals with a phase difference output from an encoder is detected and...http://www.google.es/patents/US7250881?utm_source=gb-gplus-sharePatente US7250881 - Encoder output signal correction apparatus and method
Encoder output signal correction apparatus and method
