Semiconductor integrated circuit and medium record playback device
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United States of America Patent
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Nov 14, 2006
Grant Date -
Jul 29, 2004
app pub date -
Nov 25, 2003
filing date -
Jan 27, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A disk type record playback device having a wobble signal extracting bandpass filter for controlling a filter's center frequency according to a frequency follow-up control loop including a dummy filter identical in configuration to a filter to be controlled, and a phase comparator is capable of controlling the center frequency of the bandpass filter with satisfactory accuracy. A frequency variable lowpass filter is provided in a preceding stage of the phase comparator constituting a frequency follow-up circuit and supplies a signal obtained by eliminating harmonic components from a frequency follow-up clock signal to the phase comparator. A cutoff frequency of the lowpass filter is changed in cooperation with a center frequency of the bandpass filter, based on a signal outputted from the frequency follow-up control loop.
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