Patent ID: 7372797

Claim:
A data reproduction device sampling an analog signal reproduced from a recording medium based on a synchronization clock signal synchronized with the reproduced signal, the data reproduction device comprising: an analog-to-digital (A/D) conversion part configured to convert the reproduced signal into a first digital signal based on a first clock signal; an interpolation part configured to generate a plurality of interpolation signals and interpolate the first digital signal with the interpolation signals so that the first digital signal is equalized with a second digital signal sampled based on a second clock signal having a frequency a multiple of a frequency of the first clock signal; an optimum phase detection part configured to be supplied with the interpolation signals from said interpolation part and, based on the supplied interpolation signals, detects a phase error between an optimum point of the reproduced signal and the synchronization clock signal; a phase correction part configured to be supplied with the interpolation signals from the interpolation part and select one of the interpolation signals based on the phase error supplied from the optimum phase detection part, the one of the interpolation signals having an optimum phase with respect to the reproduced signal; and an information data start detection part that detects a start of information data based on the phase error.