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Med Eng Phys. 2013 Dec;35(12):1831-6. doi: 10.1016/j.medengphy.2013.05.004. Epub 2013 Jun 10.

Heart sound cancellation from lung sound record using cyclostationarity.

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  • 1Faculty of Electronic Information and Electrical Engineering, Dalian University of Technology, 116024, China; College of Information and Communication Engineering, Dalian Nationalities University, 116600, China.


From the mechanism of heart sound generation, it is known that heart sounds are cyclic following the frequency of the heartbeat. This paper proposes a short-time cyclic frequency spectrum to calculate the instantaneous cycle frequency (ICF) of heart sounds as an estimation of the frequency of the heartbeat. Heart sounds in a lung sound record are detected with the assistance of ICF. Lung sounds (LSs) are recovered by removing heart sounds from the LS record. An LS record is the only input signal source; no other reference signal is necessary. Evaluation by visual inspection, auditory listening and spectral analysis all show that heart sounds are successfully cancelled without hampering the main components of lung sounds.

Copyright © 2013 IPEM. Published by Elsevier Ltd. All rights reserved.


Cycle detection; Cyclic component detection; Heart sound cancellation; Instantaneous cycle frequency

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