| 摘要 |
A total gain candidate determining unit determines candidates suitable as a total gain Kt in an AGC feedback loop including an equalizer, an A/D converter, and an FIR filter. For each candidate for the total gain Kt, a gain setting unit sets a corresponding gain Kp in a preamplifier 10 , and sequentially sets, in the A/D converter and the FIR filter, a gain Ka and a gain Kf which satisfy the total gain Kt. A written data storage unit stores known written data. An error rate calculating unit calculates an error rate of read data by comparing the read data and the written data. An second determining unit determines, as an optimal combination of gains, a combination of gains in which the error rate is the least.
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