% Program 11_3
% Spectrogram of a Speech Signal
%
colordef black;
load mtlb
n = 1:4001;
s1=zeros(1,4001);
figure(1)
plot(n-1,mtlb,'g',n-1,s1,'w');
xlabel('Time index n');ylabel('Amplitude');
figure(2)
nfft = input('Type in the window length = ');
ovlap = input('Type in the desired overlap = ');
specgram(mtlb,nfft,7418,hamming(nfft),ovlap)
B=specgram(mtlb,nfft,7418,hamming(nfft),ovlap)