Apparatus and method for processing signals obtained from a position encoder

(57) The processing circuit for processing two or more signals received from the detection coil (21, 23, and 25) which forms a part of position encoder used in order to code the relative position of a summary 2 relative movable component is offered. A position encoder is mutually related, although each of two or more signals from a detection coil changes in sine wave in connection with the relative position of two components, and a phase seems to shift. The processing unit is equipped with the mixer (71, 73, and 75) which carries out the multiplication of each of the received signal to one of the signals which carry out time change periodically corresponding / the plurality in which each has the same predetermined cycle and a separate predetermined phase, and the adding machine (93) adding the signal from a mixer. The phase of the signal to mix is chosen so that the output signal from an adding machine may contain the single periodic ingredient which has a predetermined cycle from which a phase changes in connection with the relative position of two components.