The analog processing and digital recording of electrophysiological signals

Abstract

The paper presents the aspects of design and implementation of a chain for electrophysiological signal recording, respectively collection, analog processing and digital data recording. The analog processing is based of dynamic range compressor circuit composed by the automatic gain control with a recovery delay to minimize the distortions, thermal behavior compensation and an adaptation stage for levelmeter. At compressor output was added a clipper, which must catch all the transitions, that escapes out of the dynamic range compressor and at clipper output a lowpass filter to cuts abruptly the high frequencies. The data vector recording is performing by strong internal resources microcontroller including ten bits A/D conversion port. © 2010 International Federation for Medical and Biological Engineering.