an eighth step which computes the time ratio, a second time ratio between the input timing of the first speed detection signal after the previous reproducing control signal is inputted with respect to the input timing of the previous reproducing control signal, and the number of {HEAD ~ the speed detection signals} from {TAIL ~ the first speed detection signal} after the previous reproducing control signal to the first speed detection signal after the current reproducing control signal and computes the number of the speed detection signal inputted thereto during one cycle of the reproducing control signal 
an eighth step which computes the time ratio , a second time ratio between the input timing of the first speed detection signal after the previous reproducing control signal is inputted with respect to the input timing of the previous reproducing control signal , and the number of { HEAD ~ the speed detection signals } from { TAIL ~ the first speed detection signal } after the previous reproducing control signal to the first speed detection signal after the current reproducing control signal and computes the number of the speed detection signal inputted thereto during one cycle of the reproducing control signal
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