figure;
waveFile='sunday.wav';
au=myAudioRead(waveFile); y=au.signal; fs=au.fs; nbits=au.nbits;
y=y*2^nbits/2;
subplot(2,1,1)
time=(1:length(y))/fs;
plot(time, y); axis([min(time), max(time), -2^nbits/2, 2^nbits/2]);
xlabel('Time (seconds)'); ylabel('Amplitude'); title('Waveforms of "sunday"');

frameSize=512;
index1=0.606*fs;
index2=index1+frameSize-1;
line(time(index1)*[1, 1], 2^nbits/2*[-1 1], 'color', 'r'); 
line(time(index2)*[1, 1], 2^nbits/2*[-1 1], 'color', 'r');
subplot(2,1,2);
time2=time(index1:index2);
y2=y(index1:index2);
plot(time2, y2, '.-'); axis([min(time2), max(time2), -2^nbits/2, 2^nbits/2]);
xlabel('Time (seconds)'); ylabel('Amplitude'); title('Waveforms of the voiced "ay" in "sunday"');