| 摘要 |
A method of correcting an output waveform of a head includes the steps of (a) obtaining a sample error value of a sample value when subjecting an analog signal output from a head to an analog-to-digital conversion, and (b) correcting a vertical asymmetry of a waveform of the analog signal when carrying out he analog-to-digital conversion by changing a corresponding relationship between the analog signal and a digital signal which is obtained by the analog-to-digital conversion based on the sample error value. The step (b) calculates a correction value with respect to the analog-to-digital conversion based on the sample error value, and changes an input range of the analog-to-digital conversion to become vertically asymmetric depending on the correction value.
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