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