| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a signal processing circuit for an encoder applicable to a high-resolution encoder and a high-frequency periodic analog signal, having only a small area which does not require signal adjustment, and which is constituted at low cost. Ž<P>SOLUTION: This signal processing circuit for the encoder processes at least two-phase periodic analog signals which vary periodically, according to the relative displacement of an encoder scale and an encoder head. The A/D conversion of an A/D conversion part 21 is performed based on an A/D conversion command from a control part 22. The control part 22 processes the A/D conversion output one time before from the A/D conversion part 21, during the A/D conversions of the A/D conversion part 21. An output part 23 outputs the amount of displacement obtained by processing in the control part 22. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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