TY - CHAP
T1 - Signal Statistics of Heart Sound Recordings
T2 - 22nd IEEE Mediterranean Electrotechnical Conference, MELECON 2024
AU - Bao, Xinqi
AU - Lamata, Pablo
AU - Kamavuako, Ernest
N1 - Publisher Copyright:
© 2024 IEEE.
PY - 2024
Y1 - 2024
N2 - Smartphones possess the potential to become widely available stethoscopes for cardiac diagnosis due to their audio processing capabilities and widespread usage. However, the quality of signals collected by phones should be characterised and compared to the signals collected by clinical stethoscopes. To this ends, this study compares the characteristics of cardiac auscultation signals captured by either smartphones or electronic clinical stethoscopes on ten subjects. Results revealed that the electronic stethoscope captures sharper and cleaner signals than the smartphone (kurtosis of 29.381 ± 29.436 vs. 4.658 ± 4.301, P < 0.001), as well as a wider frequency response range (median frequency 64.60 ± 16.65 Hz vs. 49.96 ± 11.05 Hz, P = 0.044). Besides, in the key frequency bands 1-3rd of the Mel-frequency cepstral coefficients (MFCCs), the correlation coefficients show a diverse behaviour, with the 1st and 3rd being high (average 0.993 and 0.896), while the 2nd decreases to 0.428. This implies that the time-frequency domain features extracted from the two signal groups differ, and directly transferring a model trained on electronic stethoscope data to smartphones may result in suboptimal performance. These findings illustrate the clear distinctions between using smartphones and electronic stethoscopes for auscultation. The characteristics provide valuable insights for signal quality metrics to enhance the accuracy in identifying cardiac issues and the feasibility of remote auscultation.
AB - Smartphones possess the potential to become widely available stethoscopes for cardiac diagnosis due to their audio processing capabilities and widespread usage. However, the quality of signals collected by phones should be characterised and compared to the signals collected by clinical stethoscopes. To this ends, this study compares the characteristics of cardiac auscultation signals captured by either smartphones or electronic clinical stethoscopes on ten subjects. Results revealed that the electronic stethoscope captures sharper and cleaner signals than the smartphone (kurtosis of 29.381 ± 29.436 vs. 4.658 ± 4.301, P < 0.001), as well as a wider frequency response range (median frequency 64.60 ± 16.65 Hz vs. 49.96 ± 11.05 Hz, P = 0.044). Besides, in the key frequency bands 1-3rd of the Mel-frequency cepstral coefficients (MFCCs), the correlation coefficients show a diverse behaviour, with the 1st and 3rd being high (average 0.993 and 0.896), while the 2nd decreases to 0.428. This implies that the time-frequency domain features extracted from the two signal groups differ, and directly transferring a model trained on electronic stethoscope data to smartphones may result in suboptimal performance. These findings illustrate the clear distinctions between using smartphones and electronic stethoscopes for auscultation. The characteristics provide valuable insights for signal quality metrics to enhance the accuracy in identifying cardiac issues and the feasibility of remote auscultation.
KW - Electronic Stethoscope
KW - Heart sound
KW - Signal statistics
KW - Smartphone
UR - http://www.scopus.com/inward/record.url?scp=85201733980&partnerID=8YFLogxK
U2 - 10.1109/MELECON56669.2024.10608494
DO - 10.1109/MELECON56669.2024.10608494
M3 - Conference paper
AN - SCOPUS:85201733980
T3 - 2024 IEEE 22nd Mediterranean Electrotechnical Conference, MELECON 2024
SP - 1089
EP - 1094
BT - 2024 IEEE 22nd Mediterranean Electrotechnical Conference, MELECON 2024
PB - Institute of Electrical and Electronics Engineers Inc.
Y2 - 25 June 2024 through 27 June 2024
ER -