Disc motor control circuit for controlling the rotation of a dis

Details Disc motor control circuit for controlling the rotation of a dis Disc motor control circuit for controlling the rotation of a dis

1986-09-10

1989-03-21

Richardson, Robert L.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

358321, 358338, 360 7303, 318314, G11B 1552

Patent

active

048150630

ABSTRACT:
In one aspect of the invention, a disc motor control circuit in a disc playback device comprises a rotation detection circuit for detecting the rotation speed of a disc motor and producing a rotation detection signal, a first control circuit for controlling the rotation speed of the disc motor by comparing the rotation detection signal with a reference clock, a second control circuit for controlling the rotation speed of the disc motor by comparing a synchronizing signal taken out of a reproduced signal from the disc with a reference clock, a window circuit for establishing a window for an expected timing of a next synchronizing signal on the basis of the synchronizing signal taken out of the reproducing signal, a state detection circuit for detecting a state of rotation of the disc motor by counting the number of the synchronizing signal entering the window and a mode switching circuit for selectively operating one of these control circuits in accordance with the result of counting in the state detection circuit.

REFERENCES:
patent: 4259698 (1981-03-01), Takada
patent: 4603411 (1986-07-01), Sugiyama et al.
patent: 4695778 (1987-09-01), Chito et al.

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