这个方法是以富氏变换为基础。

All this method is based on Fourier transform.

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求变数的离散富氏变换用固定点数的FFT，节省了计算时间。

The discrete Fourier Transform of the variables is computed with the FFT of fixed points.

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以有限富氏变换为基础，研究多输入-多输出频响函数估计的一般原理。

The theory of multiple input-output frequency response functions estimation is studied based on the finite Fourier transform.

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