MATLAB —— 信号处理工具箱之 ifft 的简单介绍

目录

ifft

Syntax

Description

& d; G' h; w) q6 M. o

3 x: {5 a3 h4 A0 K' M" Z4 y8 S

ifft

' i; w0 K, Q" Z6 Q% K$ W1 u) y) V5 {

Inverse fast Fourier transform

: ?1 n4 k; Y5 j5 {( i

8 d1 d6 D+ x$ O  K7 J4 J

Syntax

! O/ }, Q  l+ x( E

X = ifft(Y)

$ |) n9 ~- U8 A- y  Q

X = ifft(Y,n)

: g/ I2 A; H1 K% w+ r$ Q

X = ifft(Y,n,dim)

3 L& q0 l1 o- n$ t7 B

X = ifft(___,symflag)

8 u* I# ~6 A  c

  W0 h, V9 H2 @& N, ~/ F

Description

+ w" Z% O- f6 F( \& Q2 \

X = ifft(Y)

, Z" D) d6 m' E, O7 o! a4 ^* p6 m# [

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

* R, ^, q0 a* D0 |5 T

• If Y is a vector, then ifft(Y) returns the inverse transform of the vector.! G) ~4 I# ]/ n* \
  

, w, Z$ Y" r0 P7 K4 L

• If Y is a matrix, then ifft(Y) returns the inverse transform of each column of the matrix.
  $ S9 I4 \: z9 ], u  \7 ~9 w  U7 E0 ^

3 \, Y: j1 z! }

• 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.$ s) M$ f: F. c" [8 [9 M, |6 p3 B0 ]; j
  

/ }0 y0 o, ]4 z: L

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。

6 T4 ~: j  H, B9 j1 Z

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

+ r* P1 Z4 M6 u5 r

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.

1 @% g! q: `2 j' o

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。

& R3 J, X# V. L' Z) t% s

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

, {, {/ Q- j! L: |. E

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

% f$ e  x3 q$ a2 m4 h4 G$ K6 e5 h

0 S* S& K3 J4 l6 N( w8 W