TecnoLógicas (Jan 2014)
Threshold calculation for R wave detection in complex cardiac
Abstract
The electrocardiographic signal is an electrical signal and its amplitude is 1 mV approximately and spectral components between 0.7 and 100 Hz. The electrocardiographic signal represents the electrical behavior of the human heart and it has a group of waves called the cardiac complex. Waves comprising the cardiac complex are: P, Q, R, S and T. The R-wave corresponds to the positive wave of greater amplitude of the electrocardiographic signal and the time between each wave allows the calculation of instantaneous heart rate. The calculation of the time between R wave requires implementation of a filtering system that allows an attenuation of the spectral components that do not belong to this waveform. Then proceed to a thresholding process that consists of generating a binary signal which takes the value of one in the sample that records the wave R and zero in the other samples. The principal goal of this paper is to present the results to implement an algorithm for setting the threshold based on the calculation of the histogram of the electrocardiographic signal that has been previously addressed through a system based on filter banks.
