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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Itakura–Saito distance ： ウィキペディア英語版 Itakura–Saito distance The Itakura–Saito distance (or Itakura–Saito divergence) is a measure of the difference between an original spectrum $P(\backslash omega)$ and an approximation $\backslash hat(\backslash omega)$ of that spectrum. Although it is not a perceptual measure it is intended to reflect perceptual (dis)similarity. It was proposed by Fumitada Itakura and Shuzo Saito in the 1960s while they were with NTT.〔Itakura, F., & Saito, S. (1968). Analysis synthesis telephony based on the maximum likelihood method. In Proc. 6th of the International Congress on Acoustics (pp. C–17–C–20). Los Alamitos, CA: IEEE.〕 The distance is defined as:〔 〕 : $D\_(P(\backslash omega),\backslash hat(\backslash omega))=\backslash frac\backslash int\_^\; \backslash left(\backslash frac-\backslash log\; \backslash frac\; -\; 1\; \backslash right)\; \backslash ,\; d\backslash omega$ The Itakura–Saito distance is a Bregman divergence, but is not a true metric since it is not symmetric〔 〕 and it does not fulfil triangle inequality. In Non-negative matrix factorization the Itakura-Saito divergence can be used as a measure of the quality of the factorization: this implies a meaningful statistical model of the components and can be solved through an iterative method. == See also == * Log-spectral distance 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Itakura–Saito distance」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.