Disc player apparatus having a disc rotational speed controller
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United States of America Patent
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-
Dec 2, 1997
Grant Date -
N/A
app pub date -
Jan 7, 1997
filing date -
Nov 25, 1994
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A disc reproduction apparatus, configured so that a voltage-controlled oscillator is used as a means of giving a reference frequency to an analog phase-locked loop circuit, a control voltage based on a speed error of the rotational speed of a spindle with respect to the reference speed is given to this voltage-controlled oscillator by a rotational speed counting circuit, and a reference clock is produced in the analog phase-locked loop circuit based on the oscillation frequency given by this voltage-controlled oscillator and, at the same time, the reproduction clock PLLCK is produced by the digital phase-locked loop circuit based on this reference clock, whereby the operation becomes stable with respect to rotational outer disturbances and high speed access is enabled.
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