a ninth step which divides the cycle of the phase reference signal computed during said phase reference signal processing step into a certain number of the speed detection signal and computes a phase proceeding amount of {HEAD ~ the speed detection signal} which is referred to {TAIL ~ a desired number} of counts to be proceeded during one cycle of the speed detection signal 
is referred to
a ninth step which divides the cycle of the phase reference signal computed during said phase reference signal processing step into a certain number of the speed detection signal and computes a phase proceeding amount of { HEAD ~ the speed detection signal } which is referred to { TAIL ~ a desired number } of counts to be proceeded during one cycle of the speed detection signal
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