Heart sound cancellation from lung sound record using cyclostationarity.

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.

[1]  Zahra Moussavi,et al.  A robust method for heart sounds localization using lung sounds entropy , 2006, IEEE Transactions on Biomedical Engineering.

[2]  William A. Gardner,et al.  Measurement of spectral correlation , 1986, IEEE Trans. Acoust. Speech Signal Process..

[3]  Yongwan Park,et al.  Separation of Heart Sound Signal from Noise in Joint Cycle Frequency–Time–Frequency Domains Based on Fuzzy Detection , 2010, IEEE Transactions on Biomedical Engineering.

[4]  Zahra Moussavi,et al.  Heart Sound Cancellation Based on Multiscale Products and Linear Prediction , 2004, The 26th Annual International Conference of the IEEE Engineering in Medicine and Biology Society.

[5]  L.J. Hadjileontiadis,et al.  Adaptive reduction of heart sounds from lung sounds using fourth-order statistics , 1997, IEEE Transactions on Biomedical Engineering.

[6]  Peter Hult,et al.  Heart sound cancellation from lung sound recordings using recurrence time statistics and nonlinear prediction , 2005, IEEE Signal Processing Letters.

[7]  Paul R. White,et al.  Analysis of the second heart sound for diagnosis of paediatric heart disease , 1998 .

[8]  Stavros M. Panas,et al.  A wavelet-based reduction of heart sound noise from lung sounds , 1998, Int. J. Medical Informatics.

[9]  Nathan Intrator,et al.  Respiratory modulation of heart sound morphology. , 2009, American journal of physiology. Heart and circulatory physiology.

[10]  Z. Moussavi,et al.  Heart sound cancellation from lung sound recordings using time-frequency filtering , 2006, Medical and Biological Engineering and Computing.

[11]  P. A. Ramamoorthy,et al.  Reduction of Heart Sounds from Lung Sounds by Adaptive Filterng , 1986, IEEE Transactions on Biomedical Engineering.