The ECG recording and analysis instrumentation based on virtual instrument technology and continuous wavelet transform

This paper introduces a virtual recording and analysis instrumentation system for recording and identifying ECG signals, the system developed is aimed at constructing a PC-based virtual instrumentation which enables to record, investigate and measure the ECG signal of 12 leads simultaneously and perfectly in order to improve the measuring precision of ECG. Based on the proper feature in time domain of Mexican hat wavelet expressed by positioning and analysis precision for QRS complex, the instrumentation system uses continuous wavelet transform(CWT) and use the Mexican hat as the wavelet base to measure precisely the characteristic information and generate the precise characteristic parameters of ECG. The analysis of measured ECG signals in hospital demonstrated that even in the condition with serious disturbances, the method presented is also easily able to describe precisely the characteristic of ECG on line which makes the instrumentation system valuable in practical application.