A Digital Filtering Method for Eliminating DC Offset in Ambulatory ECG Signals.
10.3969/j.issn.1671-7104.2019.04.005
- Author:
Yu'e CHEN
1
;
Xiangyong KONG
2
;
Wenjie ZHU
1
Author Information
1. Department of Public Foundation, Bengbu Medical College, Bengbu, 233030.
2. School of Medical Instrument and Food Engineering, University of Shanghai for Science and Technology, Shanghai, 200093.
- Publication Type:Journal Article
- Keywords:
Savitzky-Golay smoothing filter;
ambulatory ECG;
digital filtering;
polarization voltage
- MeSH:
Algorithms;
Amplifiers, Electronic;
Electrocardiography, Ambulatory;
methods;
Humans;
Signal Processing, Computer-Assisted
- From:
Chinese Journal of Medical Instrumentation
2019;43(4):252-254
- CountryChina
- Language:Chinese
-
Abstract:
The amplifier is easy to saturation because of polarization voltage in ambulatory ECG acquisition. The traditional way is using analog high-pass filter to eliminate, but the output tends to have a residue. If upgrading high-pass filter cutoff frequency, it will lead to low frequency distortion of ECG signals. In this paper, a Savitzky-Golay (SG) smoothing filter has been designed by combining the single edge point and the polynomial order , which can fit the polarization voltage components of ECG signals, filter useful components and get drift-free ECG signals by using the subtraction algorithm. The results of ECG filtering experiment verify the feasibility of the SG smoothing filter, and show the filtered ECG signal without any losses of useful components.
