2020-11-29T06:26:02Zhttps://ipsj.ixsq.nii.ac.jp/ej/?action=repository_oaipmhoai:ipsj.ixsq.nii.ac.jp:000626222020-04-01T00:33:29Z01164:05064:05629:05692
Spectrogram consistency and its application to phase reconstructionSpectrogram consistency and its application to phase reconstructioneng音楽音響信号処理（２）http://id.nii.ac.jp/1001/00062622/Technical Reporthttps://ipsj.ixsq.nii.ac.jp/ej/?action=repository_action_common_download&item_id=62622&item_no=1&attribute_id=1&file_no=1Copyright (c) 2009 by the Information Processing Society of JapanNTTコミュニケーション科学基礎研究所NTTコミュニケーション科学基礎研究所東京大学大学院情報理工学系研究科東京大学大学院情報理工学系研究科JonathanLeRouxHirokazu, KameokaNobutaka, OnoShigeki, SagayamaIn this article, we derive the constraints which a set of complex numbers must verify to be a consistent STFT spectrogram, i.e., to be the STFT spectrogram of an actual real-valued signal, and describe how they lead to an objective function measuring the consistency of a set of complex numbers as a spectrogram. We then present a flexible phase reconstruction algorithm based on a local approximation of the consistency constraints and derive a real-time time-scale modification algorithm.In this article, we derive the constraints which a set of complex numbers must verify to be a consistent STFT spectrogram, i.e., to be the STFT spectrogram of an actual real-valued signal, and describe how they lead to an objective function measuring the consistency of a set of complex numbers as a spectrogram. We then present a flexible phase reconstruction algorithm based on a local approximation of the consistency constraints and derive a real-time time-scale modification algorithm.AN10438388研究報告音楽情報科学（MUS）2009-MUS-818162009-07-222009-08-19