Servo control device and optical disc device
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United States of America Patent
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May 7, 2013
Grant Date -
Jan 31, 2013
app pub date -
Jun 26, 2012
filing date -
Jul 28, 2011
priority date (Note) -
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status (Latency Note)
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Abstract
A servo control device includes a plurality of reproduction channels, a plurality of analog/digital (A/D) converters, a servo error detecting circuit that generates a servo error signal, a servo signal processing device that executes predetermined processing for the servo error signal to generate a control signal, and a sampling frequency converter that converts the sampling frequency between the servo error detecting circuit and the servo signal processing device. A first clock is included as a sampling clock of the A/D converters and a processing clock of the servo error detecting circuit. A second clock is included as a processing clock of the servo signal processing device. The sampling frequency converter converts the sampling frequency by processing the servo error signal by the servo error detecting circuit in synchronization with the first clock and processing the signal processed in synchronization with the first clock in synchronization with the second clock.
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