カテゴリ: 論文誌(論文単位)グループ名: 【C】電子・情報・システム部門発行日: 2018/04/01タイトル(英語): A Phase Vocoder without Requiring Phase Unwrapping著者名: 米口 遼一（明治大学大学院理工学研究科電気工学専攻），村上 隆啓（明治大学理工学部電気電子生命学科）著者名(英語): Ryoichi Yoneguchi (Electrical Engineering Program, Graduate School of Science and Technology, Meiji University), Takahiro Murakami (Department of Electronics and Bioinformatics, School of Science and Technology, Meiji University)キーワード: Phase Vocoder，話速変換，音高変換，位相アンラップ問題 Phase Vocoder，time scale modification，pitch scale modification，phase unwrapping problem要約(英語): In recent years, a number of algorithms for controlling parameters of an acoustic signal have been realized according as hardware technologies have been developed. A phase vocoder is one of the widely known methods for time scale modification (TSM) and pitch scale modification (PSM). The phase vocoder converts the length and the pitch of the acoustic signal by increasing or decreasing an instantaneous angular frequency. However, due to the phase unwrapping problem that occurs when the instantaneous angular frequency is estimated, the phase vocoder distorts the waveform of the modified signal. In order to alleviate this problem, we present a new algorithm for the phase vocoder. Our method does not encounter the phase unwrapping problem since we directly use the difference of phases between adjacent analysis frames to avoid estimating the instantaneous angular frequency. Moreover, our approach is effective even when the characteristics of the acoustic signal, e.g., a frequency and amplitude, change rapidly.本誌: 電気学会論文誌C（電子・情報・システム部門誌） Vol.138 No.4 （2018） 特集：信号処理と制御の融合に基づく新領域の創出本誌掲載ページ: 352-359 p原稿種別: 論文／日本語電子版へのリンク: https://www.jstage.jst.go.jp/article/ieejeiss/138/4/138_352/_article/-char/ja/
