a sixth step which subtracts the reproducing control signal data stored during said reproducing control signal processing step from the speed detection signal data and computes the number of {HEAD ~ counts} from {TAIL ~ the input timing} of the current reproducing control signal to the input timing of the first speed detection signal 
a sixth step which subtracts the reproducing control signal data stored during said reproducing control signal processing step from the speed detection signal data and computes the number of { HEAD ~ counts } from { TAIL ~ the input timing } of the current reproducing control signal to the input timing of the first speed detection signal
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 REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH