Author: Dean Korosec
Mentor: Asst. Prof. Dr. Damjan Zazula
Co mentor: Asst. Prof. Dr. Matjaz Colnaric
Date: Apr. 1993
Off-Line Analysis of One-Dimensional
Bioelectrical Signals
Keywords: digital signal processing, cardiology, cardiograph, cardiac
infraction, ECG signal, exercise test, complex QRS, personal computer, fast
Fourier transform, digital filtering
UDK: 681.32.01
Abstract: We describe some basic facts about electrocardiographic
signals, their physiological background, meaning and importance. The way of
recording and storing this kind of signals with personal computer is presented.
The discrete Fourier transform is introduced as a basic tool for spectral
analysis of the finite discrete sequences and the fast Fourier transform as a
way for its calculation on digital computers is thoroughly discussed. Some
digital filtering techniques with observation of filter spectral characteristics
are explained, especially for low pass and band pass digital filters with
integer values. Also one of the computer-aided methods for constructing digital
filters is described.
Computer program for off-line analysis of
electrocardiograhic signals, where these procedures are implemented, is
described in the final chapter. Some of the program features are: viewing and
browsing of the loaded signal, measuring time intervals and signal amplitudes,
zooming in or out, selecting part of the signal, performing filter operation,
spectral analysis, calculating the average heart beat, etc. Average heart beat
is used for calculating come parameters useful while diagnosing possible heart
attack.