Disk reproduction apparatus and tracking servo circuit

摘要

In a disk reproduction apparatus, data recorded on a disk is read and converted into an electrical signal by a pickup, thereby generating a tracking error signal. The tracking error signal is converted into a digital signal by an A/D converter. The digital signal is converted into an analog signal by a D/A converter via a tracking digital equalizer. This analog signal drives a driver. An output from the driver drives the actuator of the pickup. The tracking digital equalizer selects the first mode of preferentially increasing the resolution of output data from the tracking servo circuit or the second mode of preferentially preventing an overflow of the output data. The equalizer processes the digital data from the A/D converter. An analog gain switching circuit is connected between the tracking digital equalizer and the driver to switch between the different gains set in accordance with the mode selected by the tracking digital equalizer.