Positioning control system

Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head

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369 4429, G11B 5596

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active

060142855

ABSTRACT:
A positioning control system is provided with a controlled device which has resonance characteristic and is positioned at a designated position; position detector for detecting a moved position of the controlled device in accordance with a servo signal or the like; arithmetic controller such as a DSP (Digital Signal Processor) adapted to generate a drive signal based on a position detection signal from the position detector and the designated position; and a drive adapted to move the controlled device in accordance with the drive signal from the arithmetic controller. The arithmetic controller includes a low pass filter which has an abrupt slope and a discontinuous pole in the gain-frequency characteristics thereof to suppress the resonance characteristics.
Preferably, the low pass filter is constituted by a combination of a notch filter and an elliptical function filter.

REFERENCES:
patent: 4697127 (1987-09-01), Stich et al.
patent: 4949201 (1990-08-01), Abed
patent: 4980625 (1990-12-01), Shimada
patent: 5168398 (1992-12-01), Kanda et al.
Lathi, "Modern Digital and Analog Communication Systems" 2nd ed. 1989, pp. 81-82.
"Digital Control of Dynamic Systems", G.F. Franklin, et al., Addison-Wesley Publishing Company, 2nd Edition, 1990, pp. 703-751.
I.D. Mitchell, Jr., "A Simulation of a Digital Adaptive Notch Filter", Proceedings of the Sixteenth Southeastern Symposium on System Theory, Mar. 25-27, 1984, Silver Spring, MD, USA, pp. 165-168.

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