function[xn]=idft(Xk,N) n=[0:1:N-1]; k=[0:1:N-1]; WN=exp(-j*2*pi/N); nk=n'*k; WNnk=WN.^(-nk); xn=(Xk*WNnk)/N;
IDFT 源代码
逆离散傅里叶变换(IDFT)是数字信号处理中的核心算法之一,广泛应用于音频处理、图像重建及通信系统等领域。通过将频域信号转换回时域,IDFT技术在实现高质量信号恢复与合成方面发挥着不可替代的作用。深入理解IDFT原理及其高效实现方法对于提升工程师在信号处理领域的专业技能至关重要。…
/*****************************************************************************/ /* FIle Name : idft64.c …
% Program 3_3 % Illustration of IDFT Computation % % Read in the length K of the DFT and the desired % length N of the IDFT …
M=40;N=64;n=0:M; xa=[0:floor(M/2)];xb=ceil(M/2)-1:-1:0; xn=[xa,xb] %产生长度为M=40的三角波序列x(n) Xk=fft(x…
% Program 3_3 % Illustration of IDFT Computation % % Read in the length K of the DFT and the desired % length N of the IDFT K…
function [xn]=idft(xk,N) %this program computes Inverse Discrete Fourier Transform %its format is %xn= IDFT(Xk,N) %N is length…
function [xk]=dft(xn,N) %this program computes Discrete Fourier Transform %its format is %xk= IDFT(xn,N) %N is length of IDFT …
% Program 5_2 % Illustration of IDFT Computation % % Read in the length K of the DFT and the desired % length N of the IDFT K…
N=12;%序列长度 n=0:N-1; k=0:N-1; wn=exp(-j*2*pi/N); nk=n'*k; wnnk=wn.^(-nk); xn=(xk*wnnk)/N;%计算IDFT figure(1)%画图 stem(k,abs(xk…
% Program 3_3 % Illustration of IDFT Computation % % Read in the length K of the DFT and the desired % length N of the IDFT …