Patent ID: 8152731
Filing Date: 2012-04-10
Classification: A61B

Abstract:
1. A wavelet transform method for analyzing a subject's heart sounds for the purpose of aiding in assessing the condition of the subject's heart, said method comprising employing a heart sound detector utilizing a first defined sampling rate, obtaining heart-sound-relevant acoustic data from the subject, and processing obtained acoustic data including (a) computing the maximum-overlap discrete wavelet transform (MODWT) for a preselected number of wavelet frequency-band scales having coefficients, (b) determining, and locating the peaks in time of, the absolute values of the MODWT coefficients respecting each frequency-band scale, and (c), for each wavelet frequency-band scale, (1) interpolating between the located peaks, and (2) subsampling the result of said interpolating at another defined sampling rate which is both specific to the relevant frequency-band scale, and no greater than the mentioned first defined sampling rate.