ADAPTING MEDIAN FILTERING TO MEASUREMENT SIGNALS

Janusz Sawicki

Abstract

Filtering out disturbances from transmitted or recovered measurement signals is one of the most important tasks of analog and digital signal processing for many decades. Removing of specific disturbances, having form of separate pulses (impulsive disturbances), requires specific algorithms because of very wide spectra of such pulses. The use of median procedures, especially of weighted medians, is particularly effective in such filtering procedures. According to the applied algorithm, signal samples, which include disturbances, are eliminated and replaced by some values resulting from neighbouring nondisturbed samples. The optimum weights of median filter depend on signal shape of deterministic signals. An analysis of frequency responses of medians is given in the contribution.

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DOI

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IMEKO TC

TC4 - Measurement of Electrical Quantities

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