Orthogonality-Constrained CNMF-Based Noise Reduction with Reduced Degradation of Biological Sound. - Naoto Murakami; Shota Nakashima; Katsuma Fujimoto; Shoya Makihira; Seiji Nishifuji; Keiko Doi; Xianghong Li; Tsunahiko Hirano; Kazuto Matsunaga (Sensors, 2021)