Application of Simple Linear Phase Recursive Bandpass Filters for the Extraction of Electroencephalogram Waves

A simple type of recursive digital bandpass filters with linear phase characteristics is reconsidered, suitable when using limited computing resources such as in low-cost portable digital signal processing (PDS) applications. The extraction of the low frequency rhythms of an electroencephalogram (EEG) signal serves as a guide to illustrate the advantages of operation of this type of filters, as well as a didactic resource in the teaching of PDS in Bioengineering.