Clock extracting device of a disc reproducing apparatus...

Details Clock extracting device of a disc reproducing apparatus... Clock extracting device of a disc reproducing apparatus...

2006-07-11

2006-07-11

Psitos, A M (Department: 2656)

Dynamic information storage or retrieval

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

Control of information signal processing channel

C369S047280

Reexamination Certificate

active

07075866

ABSTRACT:
A clock extracting device of a disc reproducing apparatus includes an information read-out member for reading information signals from a disklike information recording medium; a voltage control oscillator; a phase comparator; a frequency comparator; a speed sensor for detecting the frequency of the output of the voltage control oscillator at a reference clock so as to output a speed signal; a gain command unit for designating a loop gain of a clock extracting circuit in accordance with the speed signal outputted from the speed sensor; a charge pump which discharges or draws electric current in accordance with outputs of the phase comparator and the frequency comparator and changes over an output current value in accordance with a gain command of the gain command unit; and a series circuit of a resistor and a capacitor, wherein the gain command unit issues the gain command such that the loop gain of the clock extracting circuit secures a desired operating point in accordance with a read rate of the information signals.

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patent: 693 25 685 (2000-06-01), None
patent: 0 585 090 (1999-07-01), None

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