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AbstracGThis paper examines the use of array heads for estimating the data and for providing servo information. A mathematical representation for array heads is developed, and a formula for the maximum likelihood estimate of the track misregistration is found.The case where the offtrack perturbation operator is dependent on the offtrack error is considered. This case requires a joint minimization of two branches of quadratic forms. Simulation results for a specific head configuration are given which validate the estimate and agree with the theoretical convergence rates. The estimate converges quickly enough for practical purposes in a real storage system. '

This paper presents the development and simulation of a fuzzy logic based learning mechanism to emulate human motor learning. In particular, fuzzy inference was used to develop an internal model of a novel dynamic environment experienced during planar reaching movements with the upper limb. A dynamic model of the human arm was developed and a fuzzy if-then rule base was created to relate trajectory movement and velocity errors to internal model update parameters. An experimental simulation was performed to compare the fuzzy system's performance with that of human subjects. It was found that the dynamic model behaved as expected, and the fuzzy learning mechanism created an internal model that was capable of opposing the environmental force field to regain a trajectory closely resembling the desired ideal.

The present trend of using narrow tracks in magnetic recording is severely limited by dificulties due to track misregistration. Reference [ I ] suggests that the use of array heads can reduce these dificulties. Here we will examine in more detail such application of array heads. Two classes of procedures for acquiring misregistration information will be presented here: the first class is decision oriented, that is, the data sequence is assumed known, which requires an independent detection mechanism. The second class is independent of the knowledge of the written sequence: the amount of misregistration is estimated by comparing the read back signalsfrom the heads in the array.array was used to cancel interference from adjacent tracks on the central track, and [4] used the same system to correct the skewing of the heads over the tracks.Array heads are also common in systems using magnetic tapes. In both cases of optical recording and tapes the heads are kept well separated to avoid "cross-talk" [6]. The present fear of crosstalk can be relieved if the techniques suggested in [1,2] are used. Here we will explore yet another clear advantage of using array heads: they allow for efficient estimation of track misregistration from the read-back set of voltages. The estimates can be used either to take into account the tracking error in the detection process, or to provide an error signal for a fine servo system.

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