Noise Suppression Filter.
DEPARTMENT OF THE NAVY WASHINGTON D C
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The patent describes a simple and inexpensive device for filtering undersirable high frequency noise from analog data outputs of a data processing system, which operates in two different modes and switches automatically from one to the other depending on the rate of change of data functions and on data transient amplitude with respect to full scale. If the input data is a dc level or a slowly varying dc function, the subject device operates as a low pass filter to attenuate noise in the output, and if a step or square wave function occurs in the data the filter is automatically removed until the transition is completed and then the device reverts back to the low pass filter mode of operation.
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