Signal processing method and apparatus, and a system such as a displacement detecting device using the same.

摘要

This invention relates to signal processing for enhancing detection resolving power on the basis of a periodic signal obtained in a displacement detecting device such as an encoder or a laser length measuring machine, and on the basis of input sine wave and cosine wave signals which are the references, a sine wave signal and a cosine wave signal of a frequency integer times as high as the frequency of the reference signals are produced by calculation by the use of adders, multipliers, etc. <IMAGE>