A boundary modification method for heart sound segmentation algorithm

In this paper an improved algorithm for segmentation of phonocardiographic signal has been proposed. The algorithm is based on the use of spectrogram, which is calculated from the high-pass filtered phonocardiogram. The spectrogram is quantified to two values and projected to time axis to have the boundaries of heart events. In conclusion, more exact segmentation boundaries of the heart sound signal could be achieved and the performance of further analysis is improved.