Dynamic Range: A parameter which is often quoted for analogue signal conditioning and processing electronics, but….

Wave Form Distortion: We must be quite clear that the wanted and unwanted portions of a signal may not share any part of the frequency spectrum.

Aliasing: A large number of filters are specified for ‘anti-aliasing’ use.

Settling Time: It seems reasonable that a filter should need to take a little time to somehow sense the input frequency, in order to respond appropriately.

Reconstruction: Regenerating a continuous smooth function out of its samples.