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

Claim 1

A disc player for reading information from a recording disc, comprising: signal reading means for reading a signal recorded on said recording disc and generating a read signal representative thereof, spindle reference signal generating means for generating a spindle reference signal whose phase is changed in response to a jump command, reference sync signal generating means for generating a reference sync signal having a predetermined frequency, spindle servo control means for controlling a spindle servo to perform a coarse adjustment of a time base of said read signal on the basis of a phase difference between a reproduced sync signal obtained from said read signal and said reference sync signal, fine adjustment means for performing a fine adjustment of the time base by writing a data signal, which is obtained by sampling said read signal according to a write clock signal obtained on the basis of said reproduced sync signal, into a memory sequentially in synchronism with said reproduced sync signal, starting from a predetermined address in response to a write address count starting signal in synchronism with said reproduced sync signal, and subsequently by reading the data sequentially from said memory in synchronism with said spindle reference signal while starting from said predetermined address in response to a read address count starting signal, and phase shift command issuance means for issuing a phase shift command when a difference in timing between said address count starting signal and said read address count starting signal is smaller than a predetermined time period, wherein said reference sync signal generating means, responding to said phase shift command, shifts, the phase of said reference sync signal so that said reference sync signal has a predetermined phase difference with said spindle reference signal.