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Heart sound cancellation from lung sound recordings using recurrence time statistics and nonlinear prediction

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4 Author(s)
Ahlstrom, C. ; Dept. of Biomed. Eng., Linkopings Univ., Linkoping, Sweden ; Liljefeldt, O. ; Hult, P. ; Ask, P.

Heart sounds (HS) obscure the interpretation of lung sounds (LS). This letter presents a new method to detect and remove this undesired disturbance. The HS detection algorithm is based on a recurrence time statistic that is sensitive to changes in a reconstructed state space. Signal segments that are found to contain HS are removed, and the arising missing parts are replaced with predicted LS using a nonlinear prediction scheme. The prediction operates in the reconstructed state space and uses an iterated integrated nearest trajectory algorithm. The HS detection algorithm detects HS with an error rate of 4% false positives and 8% false negatives. The spectral difference between the reconstructed LS signal and an LS signal with removed HS was 0.34±0.25, 0.50±0.33, 0.46±0.35, and 0.94±0.64 dB/Hz in the frequency bands 20-40, 40-70, 70-150, and 150-300 Hz, respectively. The cross-correlation index was found to be 99.7%, indicating excellent similarity between actual LS and predicted LS. Listening tests performed by a skilled physician showed high-quality auditory results.

Published in:

Signal Processing Letters, IEEE  (Volume:12 ,  Issue: 12 )