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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 Zero-crossing rate ： ウィキペディア英語版 Zero-crossing rate The zero-crossing rate is the rate of sign-changes along a signal, i.e., the rate at which the signal changes from positive to negative or back.〔 * Chen, C. H., Signal processing handbook, Dekker, New York, 1988〕 This feature has been used heavily in both speech recognition and music information retrieval, being a key feature to classify percussive sounds.〔Gouyon F., Pachet F., Delerue O. (2000),(Classifying percussive sounds: a matter of zero-crossing rate? ), in ''Proceedings of the COST G-6 Conference on Digital Audio Effects (DAFX-00), Verona, Italy, December 7–9, 2000''. Accessed 26 April 2011.〕 ZCR is defined formally as :$zcr\; =\; \backslash frac\; \backslash sum\_^\; \backslash right\backslash \}\}$ is 1 if its argument $A$ is true and 0 otherwise. In some cases only the "positive-going" or "negative-going" crossings are counted, rather than all the crossings - since, logically, between a pair of adjacent positive zero-crossings there must be one and only one negative zero-crossing. For monophonic tonal signals, the zero-crossing rate can be used as a primitive pitch detection algorithm. ==Applications== Zero crossing rates are used for Voice activity detection(VAD), i.e., finding whether a segment of speech is voiced or unvoiced. 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「Zero-crossing rate」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.