| 摘要 |
A data reading unit reads analog data stored on a recording medium and converts the analog data to a digital signal synchronously with a clock signal. A waveform equalizer shapes the digital signal using a coefficient. The waveform equalizer also optimizes the coefficient synchronously with the clock signal using an intensity parameter. The waveform equalizer includes a control unit for setting an initial value of the intensity parameter and dynamically adjusting the intensity parameter. The data reader also includes a PLL circuit for generating the clock signal. The PLL circuit may generate the clock signal using a second intensity parameter. The PLL circuit includes a control unit for dynamically altering the second intensity parameter.
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