Disc player apparatus having a signal processing circuit which p

Details Disc player apparatus having a signal processing circuit which p Disc player apparatus having a signal processing circuit which p

1995-11-17

1997-06-03

Tran, Thang V.

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

369 47, 369 50, 360 7303, G11B 700

Patent

active

056361920

ABSTRACT:
A disc reproduction apparatus, configured so that a voltage-controlled oscillator is used as a device 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.

REFERENCES:
patent: 4908810 (1990-03-01), Oie
patent: 5036508 (1991-07-01), Okano
patent: 5265081 (1993-11-01), Shimizume et al.

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