Patent ID: 6784654
Filing Date: 2004-08-31
Classification: G11B

Abstract:
A signal reproduction block, comprising:a filter for waveform equalization of an analog input signal; an A/D converter for converting an output signal from the filter to a digital signal; a digital signal processing section for reproducing an output signal from the A/D converter; and an output signal line through which a characteristic information signal that is obtained by inputting a test signal to the filter is output to an outside of the signal reproduction block during a characteristic measurement process of measuring a characteristic of the filter, wherein the output signal line is provided on an output side of the A/D converter; wherein an input signal to the filter is a differential signal; a bypass signal line for taking out an unfiltered signal to be input to the filter; and a signal selection circuit for receiving the unfiltered signal taken out by the bypass signal line and a filtered signal output from the filter, and for simultaneously outputting the unfiltered signal and the filtered signal to the A/D converter during the characteristic measurement process while outputting only the filtered signal to the A/D converter during a signal reproduction process.