Method for adjusting an adaptive exponential filter

Details Method for adjusting an adaptive exponential filter Method for adjusting an adaptive exponential filter

H - Electricity

03

H

H03H 21/00 (2006.01)

Patent

CA 2155519

A method for adjusting an adaptive exponential filter (3), especially for noise reduction. The input of the filter is supplied with a series of time-discrete input signals (Xk) containing both data and noise. An estimate of the standard deviation (.sigma.) of the filter input signal (Xk) has been determined prior to the execution of the adaptive exponential filter method. The method comprises the steps of: measuring the deviation (dk) between the current filter input signal (Xk) to the filter and the prior sample period's output signal (Yk-1) from the filter; determining the proportion (Rk) of the deviation to the estimate of the standard deviation; and, adjusting the discrete time constant (Fk) of the filterin response to the proportion to provide a filter output signal (Yk) at the output of the filter.

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