Avtor/Urednik		Štajer, D; Gorup, S; Gorup, Ž; Rode, P
Naslov		A signal analysing system for high resolution electrocardiography
Tip		članek
Vir		In: Hamza MH, ed. Modelling, identification and control. 9th IASTED international conference: proceedings. Innsbruck: IASTED,
Leto izdaje		1992
Obseg		str. 347-50
Jezik		eng
Abstrakt		High resolution electrocardiography (HRECG) has become an interesting non-invasive diagnostic tool for study of cardiac electrophysiolgy in patients with coronary artery disease or cardiac arrhythmias. The improved PC computers and a collection of standard additional equpment enabled development of a flexible PC-based system for HRECG. Signal for HRECG is derived from three standard orthogonal bipolar precordial leads. It is amplified by a three channel low noise amplifier with frequency range 0.05-500 Hz, and fed to an isolation amplifier. The signal is converted to a digital form by a 12 bit data acquisition card. The conversion rate used is 4kHz per channel. An external "window" trigger generator is used to start conversion of the signal. The duration of sample and number of smaples are adjustable. The original reference point of each sample, derived from the QRS complex, can be corrected using a cross-correlation algorhythm, taking into account only that part of the signal, which is of interest. The same algorhythm is used to exclude aberrant and noisy samples from further processing. The software performs signal averaging of selected samples with corrected reference point. The averaged signal is digitally filtered. A data base from each recording enables study of a variety of different recordings by different analysing protocols.
Deskriptorji		CORONARY DISEASE ARRHYTHMIA ELECTROCARDIOGRAPHY COMPUTERS SIGNAL PROCESSING, COMPUTER-ASSISSTED