快速傅里叶变换（Fast Fourier Transform，FFT），是离散傅里叶变换的快速算法，也可用于计算离散傅里叶变换的逆变换。快速傅里叶变换有广泛的应用，如数字信号处理、计算大整数乘法、求解偏微分方程等等。本条目只描述各种快速算法

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