Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Reexamination Certificate
2005-12-02
2008-10-14
Epps, Georgia Y. (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
C345S166000, C382S107000
Reexamination Certificate
active
07435942
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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Cypress Semiconductor Corporation
Epps Georgia Y.
Nuttle William E.
Wyatt Kevin
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