... j n n X e x n e (2.2.1) 为序列x(n)的离散时间傅里叶变换(DTFT,Discrete Time Fourier Transform) 。
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本文证明了时间域内的平稳相关序列经离散傅里叶变换之后,听得到的是频域内的正交随机序列。
This paper proved that a frequency stochastic sequence obtained from a stationarily correlated time series by using discrete Fourier transform is orthogonal.
本文首先对傅立叶变换的性质做了详细介绍,其中包括离散傅里叶变换,快速傅立叶变换(FFT)以及基-2按时间抽取(DIT)的FFT算法;
Firstly , the properties of Fourier Transform, including discrete Fourier Transform, FFT and based-2 DIT FFT, are introduced in this paper;
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