function countoverzeros()
wavesource=wavread('D:\mymusic\22.wav');%讀取語音信號
wl=length(wavesource);
ml=5000;    %設定截取語音信號的長度
waves=wavesource(fix(wl/2)-ml/2+1:fix(wl/2)+ml/2,2);%截取語音信號
l=100;
s=zeros(ml,1);
for n=l:ml-1
    [s(n)]=countoverzeroing(waves,n,l);%調用計算短時平均過零率的函數
end 
subplot(2,1,1);%畫出原語音信號的波形
plot(waves);
title('畫出原語音信號的波形');
subplot(2,1,2);
n=1:1:ml;
plot(n,s(n));%畫出短時平均過零率的波形
title('畫出短時平均過零率的波形');