Compensation for the dropout of a drum frequency generator signa

Details Compensation for the dropout of a drum frequency generator signa Compensation for the dropout of a drum frequency generator signa

1993-08-02

1995-01-17

Psitos, Aristotelis M.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Synchronizing moving-head moving-record recorders

360 7301, G11B 2104

Patent

active

053830660

ABSTRACT:
A drum servo system controls rotation of a head drum stably, even though a DFG signal has been dropped out. The drum servo system includes a DFG signal dropout detector for detecting the dropout of the DFG signal to generate first and second switching signals according to the detection. A digital-to-analog converter generates a drum motor driving voltage in dependence upon the first switching signal when the DFG signal is in a normal state and upon the second switching signal when the DFG signal is in an abnormal state. When the DFG signal is in the abnormal state, a previous state of the DFG signal is used for generating the drum motor driving voltage so that the head drum may rotate stably regardless of the dropout of the DFG signal.

REFERENCES:
patent: 4295171 (1981-11-01), Hirota et al.
patent: 4686583 (1987-08-01), Tomita et al.
patent: 4959733 (1990-09-01), Miura et al.

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