Dictionary:Parseval’s theorem

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This page is a translated version of the page Dictionary:Parseval’s theorem and the translation is 80% complete.

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Warning: Display title "Dictionary:Parseval’s theorem" overrides earlier display title "帕赛瓦尔定理". 有兩個非周期函數h1(t)與h2(t), 其傅里葉變換分別為H1(f)和 H2(f):


這樣, 互相關的零延遲值12(0) (左邊的兩個值) 等於叉積譜的積分; 同樣, 零頻率的互功率譜振幅Φ12(0) (右邊的兩項) 等於時間域的互能量. 參照圖F-22. 由法國數學家Marc-Antoinne Parseval des Chenes (1755–1836)命名.


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