t2f.m

来自「这是基于MATLAB的数字调相技术编程,包括对调制解调过程的编程以及其有效性和可」· M 代码 · 共 14 行

function [f,sf]=T2F(t,st)
% this is a function using the FFT function to calculate a signal's fourier
%Translation
%input is the time and the signal vectors,the length of time must greater
% than 2
% output is the frequency and the signal spectrum
dt=t(2)-t(1);
T=t(end);
df=1/T;
N=length(st);

f=-N/2*df:df:N/2*df-df;
sf=fft(st);
sf=T/N*fftshift(sf);