| 摘要 |
Aimed at is to match a timing of a clock signal with a magnetic dot of a patterned medium. A point at which an amplitude of a reproduction waveform becomes zero or a point at which an amplitude of a magnetic signal changes from the positive to negative or from the negative to positive is detected, and a zero level detection signal or zero-cross detection signal is output to a clock generation circuit which then synchronizes a clock signal with the zero level detection signal or zero-cross detection signal. This enables a matching of the clock signal with a magnetic dot.
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