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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 Quadrature filter ： ウィキペディア英語版 Quadrature filter In signal processing, a quadrature filter $q(t)$ is the analytic representation of the impulse response $f(t)$ of a real-valued filter: :$$ q(t) = f_(t) = \left(\delta(t) + \right) * f(t) If the quadrature filter $q(t)$ is applied to a signal $s(t)$, the result is :$$ h(t) = (q * s)(t) = \left(\delta(t) + \right) * f(t) * s(t) which implies that $h(t)$ is the analytic representation of $(f$ * s)(t). Since $q$ is an analytic signal, it is either zero or complex-valued. In practice, therefore, $q$ is often implemented as two real-valued filters, which correspond to the real and imaginary parts of the filter, respectively. An ideal quadrature filter cannot have a finite support, but by choosing the function $f(t)$ carefully, it is possible to design quadrature filters which are localized such that they can be approximated reasonably well by means of functions of finite support. ==Applications== 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「Quadrature filter」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.