function [Xk] = dfs(xn,N) %computes discrete fourier series coefficients %--------------------------------------------- %[Xk] = dfs(xn,N) %Xk = DFS coeff. array over 0<= k<=N-1 %xn = one period of periodic signal over 0<= n<= N-1 % N = Fundamental period of xn % n = [0:1:N-1]; %时间矢量量 k = [0:1:N-1]; %频率矢量 每隔基本频率会发生重复 WN = exp(-j*2*pi/N); %w = e^((-j*2*pi*k/N)*n) nk = n'*k; % 向左k递增 向下 n递增 WNnk = WN .^ nk; % dfs矩阵 Xk = xn * WNnk; %不同的n值相加 成为单行矩阵 只留下k参数
离散傅里叶级数的matlab实例
发布时间 2023-12-17 15:21:24作者: listjjjclove