Nonlinear transient chirp signal modeling of the aortic and pulmonary components of the second heart sound

Authors: Sun, Jingping; Durand, Louis-Gilles; Pibarot, Philippe
Abstract: Describes a new approach based on the time-frequency representation of transient nonlinear chirp signals for modeling the aortic (A2) and the pulmonary (P2) components of the second heart sound (S2). It is demonstrated that each component is a narrow-band signal with decreasing instantaneous frequency defined by its instantaneous amplitude and its instantaneous phase. Each component Is also a polynomial phase signal, the instantaneous phase of which can be accurately represented by a polynomial having an order of thirty. A dechirping approach is used to obtain the instantaneous amplitude of each component while reducing the effect of the background noise. The analysis-synthesis procedure is applied to 32 isolated A2 and 32 isolated P2 components recorded in four pigs with pulmonary hypertension. The mean /spl plusmn/ standard deviation of the normalized root-mean-squared error (NRMSE) and the correlation coefficient (/spl rho/) between the original and the synthesized signal components were: NRMSE=2.1/spl plusmn/0.3% and /spl rho/=0.97/spl plusmn/0.02 for A2 and NRMSE=2.52/spl plusmn/0.5% and /spl rho/=0.96/spl plusmn/0.02 for P2. These results confirm that each component can be modeled as mono-component nonlinear chirp signals of short duration with energy distributions concentrated along its decreasing instantaneous frequency.
Document Type: Article de recherche
Issue Date: 1 October 2000
Open Access Date: Restricted access
Document version: VoR
This document was published in: IEEE Transactions on Biomedical Engineering, Vol. 47 (10), 1328–1335 (2000)
Institute of Electrical and Electronics Engineers
Alternative version: 10.1109/10.871405
Collection:Articles publiés dans des revues avec comité de lecture

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