DENOISING OF HEART SOUND SIGNAL USING WAVELET TRANSFORM

Abstract

This paper presents a novel wavelet-based denoising method using coefficient thresholding technique.The proposed method uses the adaptive thresholding which overcome the shortcomings of discontinuous function in hard-thresholding and also can eliminate the permanent bias in soft-thresholding.The qualitative evaluation of the denoising performance has shown that the proposed method cancels noises more effectively than the other examined techniques.The introduced method can be used as preprocessor stage in all fields of phonocardiography, including the recording of fetal heart sounds on the maternal abdominal surface.