@techreport{weko_212160_1, author = "峰尾,太陽 and 庄野,逸", title = "NARU: Sign Algorithmの自然勾配法に基づくロスレス音声コーデック", year = "2021", institution = "電気通信大学, 電気通信大学", number = "1", month = "jul" }