function [ak, bk, wk] = CFS(t,y,period) % 1.输入接口:取周期主值 py = y; idx = union(find(t<0),find(t>=period)); py(idx)=[]; % 2.计算傅里叶双边谱 n = length(py); Fk1 = fft(py,n)/n; % 3.将双边谱转换为单边谱 Fk1 = fftshift(Fk1); Fk2 = conj(Fk1); % 4...
AI检测代码解析 function y = cirshftf(x,m,N) % Circular shift m samples in sequence x over[0:N-1](frequency domain) % ___ % y = cirshftf(x,m,N) % y = output sequence containing circular shift % x = input sequence of length <= N % m = sample shift % N = size of circula...
MATLAB源程序为: function y=mydiffft(x) %本程序对输入序列实现DIF-FFT基2算法,点数取大于等于长度的2的幂次 m=nextpow2(length(x));%求的x长度对应的2的最低幂次m N=2^m; if length(x)<N x=[x,zeros(1,N-length(x))];%若的长度不是2的幂,补0到2的整数幂 end for L=m:-1:1%将DFT...
Otherwise, Matlab function IFFT can be applied to get uniformly re-sampled version of input sequence X. 6. EDFT can run with a limit to the maximum number of iterations (input argument I) or either in non-iterative (I=1) mode or with additional parameters [F,S,f]=edft(X,N,tk,I...
四、设计过程 以上作了原理分析,本课程设计的核心内容是用MATLAB实现DIF-FFT运算,下面是程序实现的大致流程图: 计算x的长度n,不到2的整数幂,补0开始计算x的长度n,不到2的整数幂,补0 开始读入x(n) 补零,使蝶形运算序列倒序输出结束 MATLAB源程序为: function y=mydiffft(x) %本程序对输入序列实现DIF-FFT...
function y = cirshftt(x,m,N) % Circular shift of m samples in sequence x over 0:N-1(time domain) % ___ % y = cirshftt(x,m,N) % y = output sequence containing the circular shift % x = input sequence of length <= N ...
以下是用MATLAB语言编写计算序列x(n)的N点DFT的m函数文件dft.m: functionX=dft(x, N)% Computes the N-point DFT of the sequence x% Inputs:% x: input sequence% N: DFT length% Output:% X: DFT sequencen =0:N-1;% Time indicesk =0:N-1;% Frequency indicesWN =exp(-1j*2*pi/N);%...
functionX=dft(x)% ---% function X = dft(x)% input x - N*1% output X - N*1N=length(x);n=0:N-1;k=0:N-1;X=exp(-j*2*pi/N).^(n'*k)*x; 脚本测试 & 结果 fs=1/0.0001;t=-0.1:1/fs:0.1;x1=1*sin(2*pi*1000*t);x2=2*sin(2*pi*2000*t);x3=4*sin(2*pi*4000*...
i want to avoid using any window function, that is the reason i need DFT. How do i represent an interval of 0:N-1 summation in matlab? I am just experimenting with DFT to see what i get. I want to compare the results with windowing(FFT) and without windowing (DFT). ...
DSP MATLAB上机实验一 班级:学号:姓名: 函数代码:function xn() format long q=0.9+0.3*i; wn=exp(-2*pi*i/32); xn=q.^[0:31] xk1=(1-q^32)./(1-q*wn.^[0:31])%利用公式计算XK的理论值 xk2=fft(xn,32)%运用基二基2时间抽选的FFT算法计算Xk diff=xk1-xk2%两者的差 运行xn()即得...