Dictionary:Parseval’s theorem

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Warning: Display title "Dictionary:Parseval’s theorem" overrides earlier display title "帕赛瓦尔定理". 有两个非周期函数h1(t)与h2(t), 其傅里叶变换分别为H1(f)和 H2(f):


这样, 互相关的零延迟值12(0) (左边的两个值) 等于叉积谱的积分; 同样, 零频率的互功率谱振幅Φ12(0) (右边的两项) 等于时间域的互能量. 参照图F-22. 由法国数学家Marc-Antoinne Parseval des Chenes (1755–1836)命名.


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