Interpolation pulse generating device

摘要

Signals Sj and Sj-1 that are deviate from each other by a phase value of 2 pi /M are generated (300) by combining two sinusoidal detection signals (100,200). A reference signal DELTA S is generated which represents a difference between the signals Sj and Sj-1. An up-pulse (P+) or a down-pulse (P-) is generated every time the signal Sj or Sj-1 varies by DELTA S/n. An n-ary reversible ring counter (60) outputs a first count value and a carry or borrow pulse by counting the up-pulse and the down-pulse, and the first count value is used to control the operation of generating the up-pulse or down-pulse. An M-ary reversible ring counter (70) outputs a second count value by counting the carry pulse or the borrow pulse, and the second count value is used to control the operation of generating the signals Sj and Sj-1. <IMAGE>