Heart sound cancellation from lung sound recordings using recurrence time statistics and nonlinear prediction
2005 (English)In: IEEE Signal Processing Letters, ISSN 1070-9908, Vol. 12, no 12, 812-815 p.Article in journal (Refereed) Published
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/spl plusmn/0.25, 0.50/spl plusmn/0.33, 0.46/spl plusmn/0.35, and 0.94/spl plusmn/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.
Place, publisher, year, edition, pages
Institutionen för medicinsk teknik , 2005. Vol. 12, no 12, 812-815 p.
Bioacoustics, heart sound (HS), lung sound (LS), nonlinear prediction, recurrence time statistics
Engineering and Technology
IdentifiersURN: urn:nbn:se:liu:diva-11857DOI: 10.1109/LSP.2005.859528OAI: oai:DiVA.org:liu-11857DiVA: diva2:18261
Original publication: Ahlstrom, C., Liljefeldt, O., Hult, P. and Ask, P., Heart sound cancellation from lung sound recordings using recurrence time statistics and nonlinear prediction, 2005, IEEE Signal Processing Letters, (12), 12, 812-815. http://dx.doi.org/10.1109/LSP.2005.859528. Copyright: IEEE, http://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=972008-05-202008-05-202010-01-14