ABSTRACT
The report presents an algorithm for noise reduction in photoplethysmographic signals, applying a hybrid method based on wavelet analysis and adaptive processing threshold. The algorithm is recursive, works in the time-frequency domain, processes the detailed coefficients at each level of decomposition. Apply a discrete wavelet transform with the possibility to determine the optimal basis (Daubechies bases with a different number of coefficients were studied). The proposed algorithm is efficient, achieves good performance, and is evaluated using the parameters Signal to Noise Ratio, Root Mean Square Error, and Percentage Root Mean Square Difference. The presented algorithm is applied and tested on real PPG signals. The algorithm was tested in a software program for preprocessing of PPG signals, determination of the time series of heart rate variability, respiratory rate, and mathematical analysis of the characteristics and quality of the signal.
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Index Terms
- A Novel Photoplethysmographic Noise Removal Method via Wavelet Transform to Effective preprocessing
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