m0720.m

matlab的经典讲义

b=0.4*sinc(0.4*(-25:25));  %加矩形窗
b=b.*hamming(51)';          %加hamming窗
[H,w]=freqz(b,1,512,2);
plot(w,abs(H));
grid on
title('加hamming窗的sinc低通滤波器')