Time base control system with coarse and fine correction for a spindle

Abstract

An apparatus for reading information performing a coarse adjustment of the time base by means of a phase difference between a reproduced sync signal obtained from a read signal read from a recording medium and a reference sync signal and performing a fine adjustment of the time base by writing data obtained by sampling the read signal according to a write clock signal being obtained based on the reproduced sync signal into a memory sequentially from a predetermined address according to a write count starting signal being in synchronism with the reproduced sync signal, and subsequently, reading out the data sequentially from the predetermined address according to a read count starting signal being in synchronism with a spindle reference signal whose phase is changed according to a jump command, in which it is adapted such that, when the time interval between generation of either one of the write count starting signal and the read count starting signal and generation of the other one becomes less than a predetermined period, the phase of the reference sync signal is adjusted to have a predetermined phase difference with the phase of the spindle reference signal.