Patent ID: 7458939
Filing Date: 2008-12-02
Classification: A61B

Abstract:
1. 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 obtaining a systole (SP) and a diastole (DP) power vector consisting of the sum of n 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 while using the time of occurrence of the intensity vectors of the various classes for classifying the time distribution of murmurs.