Litton Systems Canada Limited

Willard A Young

Presented is a device and method for providing a means of driving capacitive cells, such as those comprising suspended particle light valve windows, with a squarewave voltage signal at a select frequency with high efficiency and low power requirements. The invention uses an inductive circuit in parallel with the capacitive load of the capacitive cell, a dc voltage source, and a fast switching means connected to timely control the polarity of the voltage source to the capacitive cell.

High efficiency squarewave voltage driver

The application describes digital signal processing of radar video signals to provide an optimum display. Three interacting components of the system are further described in detail: a global mean estimating circuit, a statistical analyzer circuit, and a dynamic range compression circuit. The global mean estimating circuit determines the mean of the amplitude distribution of video signals over a wide section of the display as opposed to a local mean of signals. A local mean of signals is the mean of the amplitude distribution of video signals occurring in the near vicinity of a point on the display. The statistical analyzer circuit evaluates the amplitude distribution of video signal samples and controls the gain of the signal path so that the variance of the sampled amplitude distribution follows the variance of a model distribution. The dynamic range compression circuit functions to compress the range of amplitude distribution in a manner to provide maximum information from the display.

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Brampton, Canada

Willard A Young