Comparison between myoelectric signal mean and median frequency estimates

This work was undertaken to compare the mean and median frequency properties and to evaluate the agreement between theoretical expectations and experimental findings. The relationship between mean and median frequency estimates and spectral estimation algorithms was also investigated. The results indicate that the mean frequency estimate is affected by a standard deviation about 25% lower than that of the median frequency, regardless of the estimation algorithm used. However, in clinical instrumentation the median frequency remains the preferred parameter, because of the relatively simpler computational procedure needed to estimate it online and its lower sensitivity to noise.<>