A DWT-based DSP Circuit for ECG Signal Monitoring System Application
Date Issued
2012
Date
2012
Author(s)
Chang, Kai-Hao
Abstract
Since many developed countries include Taiwan become aging society, the life nursing of the old will be a big problem. Depending on the growing development of semiconductor process, it makes this possible to achieve low-cost, small and reliable wireless medical systems. By placing the sensors on human body, people’s health can be cared at any time and any where. It can not only expand the living community of the old and chronic-illness patients, but also reduce the burden of their family.
We achieved the wireless ECG monitoring system on chip (SoC) by TSMC 1P6M 0.18 um standard CMOS process. The chip includes an analog front end (AFE), a 10 bit successive approximation register analog-to-digital converter (SAR ADC), a digital signal processing (DSP) circuit, an on-off keying transmitter (OOK TX), and an on-off keying receiver (OOK RX). The DSP circuit is designed by me, and the other circuits are designed by the other members in our laboratory.
The ECG in body surface has some strong random and background noises, which mainly include electromyography (EMG), baseline-drift caused by motion artifact and electrode motion, and power-line interference. In order to remove these noises, we apply the discrete wavelet transform based method to denoise the ECG signals. And by its multi-resolution feature, we can also increase the accuracy of R-wave detection. The design also includes UART as the interface to communicate with other device, such as computer, PDA, Bluetooth, and so on. Besides, we accomplish a LabVIEW program to be the human-machine interface connecting with our chip. Except for the real-time waveform display, it also indicates the heart rate and status of ECG signal.
Subjects
Discrete Wavelet Transform
Electrocardiogram
SDGs
Type
thesis
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