MATLAB —— 信号处理工具箱之 ifft 的简单介绍

mytomorrow · 发表于 2019-12-10 10:07

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本帖最后由 mytomorrow 于 2019-12-10 10:08 编辑

ifft

Syntax

Description

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ifft

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Inverse fast Fourier transform

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Syntax

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X = ifft(Y)

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X = ifft(Y,n)

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X = ifft(Y,n,dim)

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X = ifft(___,symflag)

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Description

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X = ifft(Y)

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X = ifft(Y) computes the inverse discrete Fourier transform of Y using a fast Fourier transform algorithm. X is the same size as Y.

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If Y is a vector, then ifft(Y) returns the inverse transform of the vector. R0 a4 g$ h" V) K

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If Y is a matrix, then ifft(Y) returns the inverse transform of each column of the matrix.
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If Y is a multidimensional array, then ifft(Y) treats the values along the first dimension whose size does not equal 1 as vectors and returns the inverse transform of each vector.
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本想翻译一下的，但是手册里面的英文描述的太清晰了，单词也很简单，所以就这样直接看吧。

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X = ifft(Y,n) returns the n-point inverse Fourier transform of Y by padding Y with trailing zeros to length n.

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X = ifft(Y,n,dim) returns the inverse Fourier transform along the dimension dim. For example, if Y is a matrix, then ifft(Y,n,2) returns the n-point inverse transform of each row.

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X = ifft（Y，n，dim）沿维度dim返回逆傅立叶变换。例如，如果Y是矩阵，则ifft（Y，n，2）返回每行的n点逆变换。

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X = ifft(___,symflag) specifies the symmetry of Y. For example, ifft(Y,'symmetric') treats Y as conjugate symmetric.

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X = ifft（___，symflag）指定Y的对称性。例如，ifft（Y，'symmetric'）将Y视为共轭对称。

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