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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 Bandwidth expansion ： ウィキペディア英語版 Bandwidth expansion Bandwidth expansion is a technique for widening the bandwidth or the resonances in an LPC filter. This is done by moving all the poles towards the origin by a constant factor $\backslash gamma$. The bandwidth-expanded filter $A\text{'}(z)$ can be easily derived from the original filter $A(z)$ by: :$A\text{'}(z)\; =\; A(z/\backslash gamma)$ Let $A(z)$ be expressed as: :$A(z)\; =\; \backslash sum\_^a\_kz^$ The bandwidth-expanded filter can be expressed as: :$A\text{'}(z)\; =\; \backslash sum\_^a\_k\backslash gamma^kz^$ In other words, each coefficient $a\_k$ in the original filter is simply multiplied by $\backslash gamma^k$ in the bandwidth-expanded filter. The simplicity of this transformation makes it attractive, especially in CELP coding of speech, where it is often used for the perceptual noise weighting and/or to stabilize the LPC analysis. However, when it comes to stabilizing the LPC analysis, lag windowing is often preferred to bandwidth expansion. == References == P. Kabal, "Ill-Conditioning and Bandwidth Expansion in Linear Prediction of Speech", ''Proc. IEEE Int. Conf. Acoustics, Speech, Signal Processing'', pp. I-824-I-827, 2003. 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「Bandwidth expansion」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.