clear?all;
close?all;
clc;
[YFsbits]=wavread（‘DSP（09）_DF.wav‘）;%?read?the?sound?file
L=length（Y）;
nT=（0:1/Fs:（L-1）/Fs）;%set?sample?frequency
subplot（311）;
plot（nTY）;%produce?the?image?of?time?domain
title（‘time?domain‘）;
xlabel（‘time（sec）‘）;
ylabel（‘amplitude（V）‘）;

b=fft（YL）;%compute?DFT
nF=（0:Fs/L:（Fs-Fs/L））;
c=abs（b）;%?compute?the?DFT‘s?magnitude
d=20*log10（c）;
subplot（312）;
plot（nFd）;
title（‘frequency?domain‘）;
xlabel（‘frequency（hz）‘）;
ylabel（‘magnitude（u）‘）;

subplot（313）
specgram（Y[]Fs）;%?make?the?mixed?time-frequency?domain?specgram
colorbar;
title（‘mixed?time-frequency?domain‘）;
xlabel（‘time（sec）‘）;
ylabel（‘frequency（hz）‘）;

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件???????1329??2010-03-15?11:34??compare.m

?????文件?????154060??2010-01-09?12:06??DSP（09）_DF.wav

?????文件???????1077??2010-03-15?11:05??filter.m

?????文件????????679??2010-03-15?08:55??analysis.m

-----------?---------??----------?-----??----

???????????????157145????????????????????4