MATLAB —— 信号处理工具箱之 ifft 的简单介绍

mytomorrow

( E, g6 ]% v, v

目录

ifft

Syntax

Description

) g, m/ [  i3 k% j3 P: Y

1 D# }7 @  a7 \' P3 U

ifft

. x5 f5 h3 t7 G2 x. {

Inverse fast Fourier transform

5 s8 z; E+ u$ @. e

3 K  l3 T; g$ E8 w2 R9 x

Syntax

+ Z% U0 k$ w4 f/ s

X = ifft(Y)

X = ifft(Y,n)

8 b0 Q6 j9 f: a7 x! t

X = ifft(Y,n,dim)

9 r  L2 `$ o3 R: h  a& |  A

X = ifft(___,symflag)

1 S1 @8 Y) h+ [% R5 z/ f

Description

. K7 m4 H$ }2 S& F0 F* \5 E9 H6 a: d

X = ifft(Y)

. ^& M; I& [8 y, }; B

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

! A& T0 |7 s" d0 X6 D2 J

• If Y is a vector, then ifft(Y) returns the inverse transform of the vector.
  

• If Y is a matrix, then ifft(Y) returns the inverse transform of each column of the matrix.
  

1 v! O$ F  j1 G) b# C9 A. X* S8 h4 H, O

• 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.
  % g+ I2 \' o* h( z

: N" v9 i" A. X2 Y6 H: v4 L+ A

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。

2 p7 ^$ q( m6 {& i

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

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.

, w% S0 N9 s1 g: G/ A/ ^

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。

" X6 u( n2 g& S; R% m

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

4 R3 J- I% b+ @$ P7 V2 Q+ b8 s; _8 O

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

, g# C. ^4 Z. h7 o1 {% U6 S% |' `

% s9 N' b# r5 L5 u* `! E1 M

Neken

学习了