In summary

We have learnt some simple methods to eliminate frequencies (filters). In Clinical Neurophysiology we use filters continuously. The introduction of digital filtering allows a postrecording analysis of traces and constitutes an important advantage in relation to the classical methods of recording. Modern equipment acquire signals with a wide passband and modifies the traces in the representation.

The methods described in this sections and many other included in Scilab have a wide range of applications alone or in combination with other digital techniques.

If we are interested in evaluating shapes or in taking measurements of latencies, it is important to take into account the phase delay in different frequencies to avoid distortions of the signals.