Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Patent
1988-10-31
1990-07-17
Richardson, Robert L.
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
369 54, 369 4411, 369 4421, G11B 700
Patent
active
049425641
ABSTRACT:
A method for operating a programmable digital signal processor in an optical disk drive to compensate tracking and/or focus servo system gain each time a new disk is inserted. The digital signal processor receives a servo error signal and outputs a servo control signal. Data characteristic of a desired servo system gain at a predetermined test frequency is stored in memory. The digital signal processor generates a test signal at the test frequency and sums the test signal with the servo error signal. Servo system gain at the test frequency is determined by computing the ratio of the amplitude of the servo error signal before it is summed with the test signal and the amplitude of the summed servo error signal and test signal. A corrected gain factor is computed as a function of the current servo system gain, the desired servo system gain and current gain factor. The corrected gain factor is stored in memory. The servo error signal is thereafter multiplied by the gain factor so servo system gain equals the desired servo system gain.
REFERENCES:
patent: 4700056 (1987-10-01), Silvy et al.
patent: 4764860 (1988-08-01), Takao
patent: 4841506 (1989-06-01), Kiyoura et al.
Hofer Gregory V.
McDonald James C.
Hewlett--Packard Company
Richardson Robert L.
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