examp56.m

来自「ADSP TOOLBOX: Version 2.0 and gui m-file」· M 代码 · 共 12 行

clc,echo on 
%EXAMPLE 56 
f0=30;S=128;N=256;N1=1024; 
n=0:N-1; f=(0:N1-1)*S/N1;      % DT Index  and frequency axis (Hz)
x=cos(2*pi*f0*n/S);            % Signal
X=abs(fft(x,N1))/N1;           % Normalized FFT for rectangular (no) window
xa=x.*window('hamm',N);        % Hamming windowed signal 
XA=abs(fft(xa,N1))/N1;         % Normalized FFT of Hamming windowed signal
plot(f,X)
echo off %end of example