Rotational speed controlling apparatus for recording disc

Details Rotational speed controlling apparatus for recording disc Rotational speed controlling apparatus for recording disc

1981-09-02

1984-03-27

Wolff, John H.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369111, 369240, 358338, 358339, G11B 1924

Patent

active

044398492

ABSTRACT:
An apparatus for controlling the rotational speed of a recording disc to a constant linear velocity. The apparatus has frequency and phase control circuits which detect the variations of the frequency and phase of the digital information signal reproduced from the disc, to detect the rotation speed of the disc. The rotation of the disc is controlled in response to the control signals from the frequency and phase control circuit to a constant linear velocity.

REFERENCES:
patent: 3939302 (1976-02-01), Kihara
patent: 4223349 (1980-09-01), Dakin et al.
patent: 4338683 (1982-07-01), Furukawa et al.
patent: 4353089 (1982-10-01), Winslow et al.

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