Rotation control circuit based on the mean value of run length code generation patterns reproducing apparatus equipped with the rotation control circuit

摘要

Disclosed are a rotation servo circuit and a reproducing apparatus equipped therewith. In the rotation servo circuit, the average value of an inversion probability pattern of a run length code recorded on a recording medium is calculated in advance and, on the basis of the average value thus obtained, a reference rotation voltage is generated, so that a rotation in accordance with the reference rotation voltage is effected whenever a reference number of revolutions is deviated from.