Low-pass filtered derivative

This routine is much useful for detecting spikes on a variable baseline. The principle of this algorithm is to compute the first derivative of a signal and to apply a low-pass filter, all in one pass. Refer to the Usui and Amidror (1982) paper for the frequency properties of this family of filters. Different implementation approaches of these filters are reported in Marion-Poll and Tobin (1992).

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Created: 07/16/97; last modification: 07/16/97