waveFile='csNthu.wav';
frameSize=256;
overlap=0;
au=myAudioRead(waveFile); y=au.signal; fs=au.fs;
frameMat=enframe(y, frameSize, overlap);
frameNum=size(frameMat, 2);
zcr=frame2zcr(frameMat);
sampleTime=(1:length(y))/fs;
frameTime=frame2sampleIndex(1:frameNum, frameSize, overlap)/fs;
subplot(2,1,1); plot(sampleTime, y); ylabel('Amplitude'); title(waveFile);
subplot(2,1,2); plot(frameTime, zcr, '.-');
xlabel('Time (sec)'); ylabel('Count'); title('ZCR');