Patent ID: 7458939

Claim:
A procedure used for extracting murmur information, characterised in that it comprises the following steps: obtaining a digital representation of heart sound for a predetermined number of seconds, identifying the time of occurrence of the first and second heart sounds in each cycle, windowing the parts of heart sounds falling between the first and second heart sounds, and second and first heart sounds, respectively decomposition of the signals into a predetermined first number n 1 of frequency bands, each band being decomposed into a predetermined second number n 2 of time-slices obtaining a systole (SP) and a diastole (DP) power vector consisting of the sum of n 1 powers measured in each of the n 2 time slices for each combination of a frequency band and a time slice, the power values from the different systoles are compared, and the median value is chosen to be the standard value for a power vector obtaining a systole (SMF) and a diastole (DMF) mean frequency vector by weighting the power value for each of n 1 frequency bands with the mean frequency of the corresponding band, summing the results and dividing the sum by the corresponding element in the respective systole or diastole power vector while using the time of occurrence of the intensity vectors of the various classes for classifying the time distribution of murmurs.