互譜密度函式(cross-spectral density function)是互相關函式的傅立葉變換。互譜密度函式一般與互相關函式具有同樣的套用,但它提供的結果是頻率的函式而不是時間的函式。這—事實大大開拓了使用範圍,因此在可以套用相關分析的工程問題中大大增加了互譜方法的套用。互譜密度函式是有重要用途的,頻譜分析中能用互譜的測量結果來識別動力系統的特性以及計算頻響函式的振幅比和相位角。
基本介紹
- 中文名:互譜密度函式
- 外文名:cross-spectral density function
- 所屬學科:數理科學
- 簡介:互相關函式的傅立葉變換
互譜密度函式的定義
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互譜密度函式的性質
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