Key result
Denoising fetal phonocardiogram signals using discrete wavelet transforms with the coif1 wavelet and soft threshold improved the signal-to-noise ratio to 11.69 dB.
Why the study?
Passive, non-invasive fetal heart rate monitoring via fetal phonocardiography is frequently disturbed by maternal sounds, fetal movement, and ambient noise.
Does discrete wavelet transform denoising improve the signal-to-noise ratio of fetal phonocardiogram signals?
Does discrete wavelet transform denoising improve the signal-to-noise ratio of fetal phonocardiogram signals?
Discrete wavelet transform using the coif1 wavelet and soft threshold effectively denoises fetal phonocardiogram signals, significantly improving the signal-to-noise ratio.
May aid non-invasive fetal monitoring; leaves open prospective clinical validation.
The obligation for comprehensive fetal heart rate investigation had driven to improve the passive and non-invasive diagnostic instruments despite the USG or CTG method. Fetal phonocardiography (f-PCG) utilizing the auscultation method met the above criteria, but its interpretation frequently disturbed by the presence of noise. For instance, maternal heart and body organ sounds, fetal movements noise, and ambient noise from the environment where it is recording are the noise that corrupted the f-PCG signal. In this work, the use of discrete wavelet transforms (DWT) to eliminate noise in the f-PCG signal with SNR as the performance parameters observed. It was observing the effect of changes in wavelet type and threshold type on the SNR value. The test was carried out on f-PCG data taken from physio.net. Initial SNR values ranged from -26.7 dB to -4.4 dB; after application of DWT procedure to f-PCG, SNR increased significantly. Based on the test results obtained, wavelet type coif1 with the soft threshold gave the best result with 11.69 dB in SNR value. The coif1 had a superior result than other mother wavelets that use in this work, so the fPCG signal analysis for fetal heart rate investigation suggested to use it.
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Fuadina et al. (2019) studied Fetal phonocardiography signal noise. Discrete wavelet transforms (DWT) vs. Initial noisy signal and other mother wavelets was evaluated on Signal-to-noise ratio (SNR). Denoising fetal phonocardiogram signals using discrete wavelet transforms with the coif1 wavelet and soft threshold improved the signal-to-noise ratio to 11.69 dB.
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