Signal processing circuit having a voltage controlled oscillator

Details Signal processing circuit having a voltage controlled oscillator Signal processing circuit having a voltage controlled oscillator

1997-01-14

1999-12-28

Neyzari, Ali

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369 32, G11B 1722

Patent

active

060090553

ABSTRACT:
A laser beam is irradiated from a pickup head on a disk. Light reflected by the disk is detected by the pickup head. The data is binarized by a data slice circuit, and a synchronizing clock and a synchronizing signal are extracted by a PLL and synchronizing signal separation circuit. The center frequency of the voltage controlled oscillator of the PLL and synchronizing signal separation circuit continuously changes according to a control voltage. A disk motor control circuit continuously changes the rotation speed of the disk in accordance with a control instruction from a system controller. The disk rotates at the highest rotation speed at which a data read operation is normally performed. The characteristics of the voltage controlled oscillator change in correspondence with the rotation speed of the disk.

REFERENCES:
patent: 5528574 (1996-06-01), Takeuchi et al.

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