Servo apparatus for tracking and rotational speed control

Details Servo apparatus for tracking and rotational speed control Servo apparatus for tracking and rotational speed control

1985-03-12

1988-05-31

Richardson, Robert L.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

360 77, 360 73, G11B 700

Patent

active

047486082

ABSTRACT:
A system for playing back information recorded on a recording disc includes a first servo control system responsive to a tracking error signal, which adjusts the position of an information reading point of a pickup relative to the recording track on the recording disc, and a second servo control system responsive to a synchronizing signal contained in the playback information signal, which adjusts the speed of rotation of the recording disc. The system is further provided with first detection means responsive to the tracking error signal for detecting a condition where the information reading point has moved across a predetermined number of sections of recording track in a radial direction of the recording disc, and a second detection means responsive to the synchronization signal for detecting a condition where the synchronization signal is not read out up to a predetermined number regularly, and a control means for suspending the servo control operation of at least one of the first and second servo control systems in accordance with output signals of the first and second detection means.

REFERENCES:
patent: 4371899 (1983-02-01), Ceshkovsky et al.

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