Digital filter for random variable

Details Digital filter for random variable Digital filter for random variable

1988-10-25

1991-03-26

Dixon, Joseph L.

Boots, shoes, and leggings

166250, 166253, 166292, 250260, G06F 1500, G01T 116

Patent

active

050035029

ABSTRACT:
A digital filter for use with a randomly generated variable, such as in a radioactive densometer, is provided and includes a microprocessor and timing clock for sampling the random variable over a specific time interval. The microprocessor utilizes a weighting factor based upon a first confidence factor and computes the mean value of a first sample of the random variable and compares the number of standard deviations that a subsequent sample is from the mean value of the previous sample and uses a probability related factor to determine if the subsequent sample represents an actual change in density. Further, the microprocessor uses a second confidence factor in determining the weighting factor which counts the number of consecutive times that the subsequent samples are greater than, or less than the mean value and again determines a probability related factor to determine if a change in density is actually occurring. As both the first and second confidence factors increase, so does the weighting factor and the probability that an actual change in fluid density has occurred.

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