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Abstract

A signal processing method is provided for sensing movement of an optical sensor relative to a surface. Generally, the method includes steps of: (i) generating sets of signals responsive to motion along each of a first, second, and third direction, the directions not necessarily all different, (ii) combining the sets of signals to generate a first complex signal for each direction at a first time; (iii) combining the sets of signals to generate a second complex signal for each direction at a second time subsequent to the first time; (iv) computing a third complex signal for each direction wherein each of the third complex signals is a predicted value for each of the second complex signals, the predicted signal depending on a number of values representing distance moved; and (v) determining optimum values of the values representing distance moved by minimizing differences between the second and third complex signals.

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First Claim