Ecg Research Paper

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CHAPTER 2

ECG SIGNAL RECORDING AND PREPROCESSING USING LABVIEW

2.1 INTRODUCTION

ECG activity is recorded on graph sheets or monitors by placing the electrodes on specific locations of the body of a person. The record shows a series of electrical waves that occurs during each beat of the heart. The recorded waves have peaks and valleys and normally represented by P, Q, R, S and T waves. These human ECG signals have very low amplitude in the mV range and the frequency range is 0.05–100 Hz and most of the useful information contained in the range of 0.5–45 Hz (Wiggins et al 2008). Real time monitoring plays an important role in biomedical signal processing, such as ECG, EMG, EEG etc. Personal computers have become a standard platform …show more content…

Since DAQ device acquire electrical signals, a transducer has to convert some physical phenomenon into an electrical signal. These signals can either intelligently control systems or provide a stimulus so that the DAQ can estimate the output. DAQ-STC includes a total of seven 24-bit and three 16-bit counters and a maximum timing resolution of 50ns. The DAQ-STC provides buffered pulse generation, equivalent time sampling and seamless changing of the sampling rate. PC based data acquisition offers users the flexibility to develop control and measurement solutions for any …show more content…

It can measure the frequency components within the signal. FFT-based measurement requires digitization of a continuous signal. According to the Nyquist criterion, the sampling frequency Fs must be at least twice the maximum frequency component in the signal. If this criterion is violated, a phenomenon known as aliasing occurs. When the Nyquist criterion is violated, frequency components above half the sampling frequency appear as frequency components below half the sampling frequency, resulting in an erroneous representation of the signal. This is called frequency aliasing. Therefore, before a signal is digitized, anti-aliasing filters are used to attenuate the frequency components at and above half the sampling frequency to a level below the dynamic range of the analog-to-digital converter

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