%?Pitch?Tracking??
%?
[xfs]=wavread（‘c1_sentence1‘）;
N=600;
OL_rate=0.5;
N_shift=N*（1-OL_rate）;
framenumber=fix（length（x）/N_shift-N/N_shift）+1;
for?i=1:framenumber
?????k=N_shift*（i-1）+1;
?????acf=xcorr（x（k:k+N-1））;
?????[rmax1imax1]=max（acf）;??%??1st?peak?is?at?N
?????[rmin1imin1]=min（acf）;
?????acf（imin1:2*imax1-imin1）=0;
?????[rmax2imax2]=max（acf）;
?????pitch=abs（imax1-imax2）/fs;
?????pm（i）=pitch;
?????
end


clear?all