Patent ID: 7590041

Claim:
A playback signal processing device for receiving an analog playback signal and extracting, from the analog playback signal, binary digital data and a clock which is synchronized with the digital data, the playback signal processing device comprising: a synthesizer for outputting a fixed clock of a predetermined frequency; an A/D converter for receiving the analog playback signal and the fixed clock from the synthesizer, quantizing the analog playback signal in accordance with the timing of the fixed clock, and outputting digital playback data; a digital equalizer for receiving the playback data from the A/D converter and a plurality of coefficients and equalizing the playback data according to the plurality of coefficients in accordance with the timing of the fixed clock from the synthesizer; an interpolator for receiving the playback data equalized by the digital equalizer and a resample control signal and obtaining, from the equalized playback data, resampled data and a resampled clock that correspond to clock information contained in the equalized playback data; a timing recovery circuit for outputting frequency ratio information on a ratio between a frequency indicated by clock information contained in the analog playback signal and the frequency of the fixed clock output from the synthesizer, according to the resampled data and the resampled clock from the interpolator; a control circuit for receiving the frequency ratio information from the timing recovery circuit and an external signal, generating the resample control signal based on the received frequency ratio information and external signal to output the resample control signal to the interpolator, and generating a coefficient setting control signal based on the received frequency ratio information and external signal to output the coefficient setting control signal; and a coefficient setting device for receiving the coefficient setting control signal from the control circuit, generating the plurality of coefficients based on the coefficient setting control signal, and outputting the plurality of coefficients to the digital equalizer.