A novel heart sound activity detection framework for automated heart sound analysis
Heart sound activity detector (HSAD) is presented based on instantaneous phase waveform of the envelope of a filtered PCG signal. Total variation filter provides better noise-reduction while preserving components of heart sounds and murmurs. Envelope extractor achieves better nonlinear peak amplification and reduces effect of magnitude of residual noise components. Boundaries of heart sounds (S1, S2, S3, S4) and murmurs are automatically determined using instantaneous phase waveform of the envelope. HSAD accurately determines the boundaries of low-amplitude heart sounds and murmurs even under low SNR conditions.
heart sound analysis phonocardiogram heart sound segmentation cardiac signal monitoring audio-visual stethoscope