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Hardware-software preprocessing platform for high immunity ECG recording

An embedded hardware-software Electrocardiogram platform had been conceived, were the design of the Einthoven's lead DI was been described. The system is based on the use of dry electrodes which had been set on three points of the body skin, the sensed signal fed an analog signal pre-processor to enhance its level and improve its noise immunity. The analog processor includes a typical filtering in two bands: the first band B1 is from 0.05 to 40Hz and the second B2 is from 0.05 to 150Hz. Since the analog signal approaches both the desired level and signal to noise ratio, a digital circuit based on microcontroller (AN2131QC) transforms the signal across a normalized USB bus transfer. In any cases, the embedded system could communicate in real time directly to a computer with USB port. Several data acquisition and recording file have been accomplished. Then, some processing tools have been implemented under MATLAB software as the representation of the ECG signals and its spectrum analysis for furthers offline processing.