Disc player apparatus having a signal processing circuit which produces a reproduction clock synchronism with a reproduced signal

A disc reproduction apparatus which produces a reproduction clock in synchronization with a signal reproduced from a disc and performs a signal processing with respect to said reproduced signal based on said reproduction clock, comprising:

• a rotational speed counting means for detecting a rotational speed of a spindle based on said reproduced signal and producing a speed error as a control signal in accordance with the rotational speed of the spindle and a reference speed;
• a filter means whose cut-off frequency is variable in accordance with a changeover control signal and which extracts only a predetermined frequency range of said control signal by a related cut-off frequency and outputs the same;
• an oscillation means whose oscillation frequency changes in accordance with a control signal output from said filter means;
• a first phase-locked loop circuit which produces a reference oscillation clock of a predetermined frequency based on the oscillation frequency of said oscillation means;
• a second phase-locked loop circuit which produces said reproduction clock based on said reference oscillation clock, detects a frequency error and a phase error of said reproduced signal with respect to said reproduction clock, and controls a frequency and a phase of said reproduction clock based on that frequency error and phase error;
• an acceleration detection means for receiving said oscillation output and reference clock and detecting roll acceleration;
• and
• a control means for outputting said changeover control signal in accordance with a result of a comparison between said detected acceleration and a preliminarily set acceleration to said filter means.