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汕头大学海洋科学接受调剂
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wypward:谢谢参与 2010-07-02 15:37:34
moonlove(金币+5, 翻译EPI+1):谢谢 2010-07-03 22:51:44
For a stochastic process, the power spectral density function PSD is used to express its average spectral charateristcs. The PSD and the autocorrelation function are a pair of Fourier functions. The definition is as following,
Assume an interval with length T from x(t) is expressed as xT(t). If its Fourier transform is XT(t), then the PSD of X(t) is,
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