Denoising of Fetal Phonocardiogram Signal by Wavelet Transformation Irmalia Suryani Faradisa, Ananda Ananda, Tri Arief Sardjono and Mauridhi Hery Purnomo E3S Web Conf., 188 (2020) 00013 Published online: 08 September 2020 DOI: 10.1051/e3sconf/202018800013