图4-2-9典型窗函数的归一化幅频对数特性.txt

典型窗函数的归一化幅频对数特性

%图4-2-6窗函数的时域波形

%Nomalized frequency (/pi)

%Magnitude

%%%%%%%%%%%%%%%%%显示频谱
%图4-2-6窗函数的频谱波形
clear;
N=64;
w = boxcar(N);
[h,f] = freqz(w/sum(w),1,512,2);
subplot(3,2,1);
plot(f,20*log10(abs(h)),'k');
title('boxcar');

w = triang(N);
[h,f] = freqz(w/sum(w),1,512,2);
subplot(3,2,2);
plot(f,20*log10(abs(h)),'k');
title('triang');

w = hanning(N);
[h,f] = freqz(w/sum(w),1,512,2);
subplot(3,2,3);
plot(f,20*log10(abs(h)),'k');
title('hanning');

w = hamming(N);
[h,f] = freqz(w/sum(w),1,512,2);
subplot(3,2,4);
plot(f,20*log10(abs(h)),'k');
title('hamming');

w = blackman(N);
[h,f] = freqz(w/sum(w),1,512,2);
subplot(3,2,5);
plot(f,20*log10(abs(h)),'k');
title('blackman');