Disc rotation control device for a disc player

Details Disc rotation control device for a disc player Disc rotation control device for a disc player

1984-10-05

1988-02-23

McElheny, Jr., Donald

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369 59, 369111, 358338, G11B 1924

Patent

active

047275308

ABSTRACT:
A disc rotation control device for a compact disc player comprises a stable rotation detection circuit for detecting whether rotation of a compact disc is in a stable state or in an unstable state, a phase control loop for phase-controlling the disc rotation and direct control means for directly controlling the disc rotation. The disc rotation is controlled by the phase control loop when the disc rotation is in a stable state and, if the disc rotation has become unstable, the control of the disc rotation is switched to one by the direct control means. During the phase control, even if an EFM signal reproduced from a disc has become unavailable for some reason, preceding phase difference data is held and used for the disc rotation control.

REFERENCES:
patent: 4353089 (1982-10-01), Winslow et al.
patent: 4376956 (1983-03-01), Kelleher
patent: 4575835 (1986-03-01), Nishikawa et al.

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