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Comparison and Noise Suppression of the Transmitted and Reflected Photoplethysmography Signals
Joint Authors
Wu, Jiang
Li, Suyi
Liu, Lijia
Tang, Bingyi
Li, Dongsheng
Source
Issue
Vol. 2018, Issue 2018 (31 Dec. 2018), pp.1-9, 9 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2018-09-26
Country of Publication
Egypt
No. of Pages
9
Main Subjects
Abstract EN
The photoplethysmography (PPG) is inevitably corrupted by many kinds of noise no matter whether its acquisition mode is transmittance or reflectance.
To enhance the quality of PPG signals, many studies have made great progress in PPG denoising by adding extra sensors and developing complex algorithms.
Considering the reasonable cost, compact size, and real-time and easy implementation, this study proposed a simple real-time denoising method based on double median filters which can be integrated in microcontroller of commercial or portable pulse oximeters without adding extra hardware.
First, we used the boundary extension to preserve the signal boundary distortion and designed a first median filter with the time window at approximately 78 ms to eliminate the high-frequency components of the signal.
Then, through the second median filter with a time window which was about 780 ms, we estimated the low-frequency components.
Finally, we removed the estimated low-frequency components from the signal to obtain the denoised signal.
Through comparing the multiple sets of signals under calmly sitting and slightly moving postures, the PPG signals contained noises no matter whether collected by the transmittance-mode or the reflectance-mode.
To evaluate the proposed method, we conducted measured, simulated experiments and a strong noisy environment experiment.
Through comparing the morphology distortions, frequency spectra, and the signal-to-noise ratios (SNRs), the results showed that the proposed method can suppress noise effectively and preserve the essential morphological features from PPG signals.
As a result, the proposed method can enhance the quality of PPG signals and, thus, can contribute to the improvement of the calculation accuracy of the subsequent physiological parameters.
In addition, the proposed method could be a good choice to address the real-time noise reduction of portable PPG measuring instruments.
American Psychological Association (APA)
Li, Suyi& Liu, Lijia& Wu, Jiang& Tang, Bingyi& Li, Dongsheng. 2018. Comparison and Noise Suppression of the Transmitted and Reflected Photoplethysmography Signals. BioMed Research International،Vol. 2018, no. 2018, pp.1-9.
https://search.emarefa.net/detail/BIM-1126705
Modern Language Association (MLA)
Li, Suyi…[et al.]. Comparison and Noise Suppression of the Transmitted and Reflected Photoplethysmography Signals. BioMed Research International No. 2018 (2018), pp.1-9.
https://search.emarefa.net/detail/BIM-1126705
American Medical Association (AMA)
Li, Suyi& Liu, Lijia& Wu, Jiang& Tang, Bingyi& Li, Dongsheng. Comparison and Noise Suppression of the Transmitted and Reflected Photoplethysmography Signals. BioMed Research International. 2018. Vol. 2018, no. 2018, pp.1-9.
https://search.emarefa.net/detail/BIM-1126705
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1126705