problem with wavelet transform of voice signal
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i have taken a realtime voice signal as an input and trying to perform wavelet transform of it.... i can get the individual plotting of each increment of sampling fequency but i cant plot all the spectrum in a single 3d image Can you help me how can i get the image? i have attached my code below
play(rec);
a = getaudiodata(rec);
plot(a); L=length(a);
init_freq=0.05; final_freq=.250;
freq_inc=0.05; freq_step=(final_freq-init_freq)/freq_inc;
S_STFT=tVWFT(a,init_freq,freq_inc,final_freq); % Windowed Fourier transorm
%%%%%%%%%%%%%%%%%%%%%%%%%%% code for the function%%%%%%%%%%%%%%%%%%%%%%%%%%
function Y=tVWFT(x,wxl,wxi,wxh)
f=fopen('STFT_V.txt','w'); L=length(x);
Y=[];
for wxt=wxl: wxi: wxh
wxt=0.7;
if(wxt~=0.0)
hwl=floor(3.0/abs(wxt));
else
hwl=floor(3.0/abs(0.01*wxi));
end
wl=2*hwl+1;
win_cor=-hwl:hwl;
if L<wl
z=wl-L;
x=[x,zeros(1,z)];
end
win=exp(-win_cor.^2/2.0/wl/wl);
wave=win.*exp(i*wxt*2.0*pi*win_cor);
Y1=conv(x,wave);
Y2=Y1((hwl+1):(L+hwl));
figure;
plot(abs(Y2));
for iii=1:L
fprintf(f,'%0.2f\t',abs(Y2(iii)));
end
fprintf(f,'\n');
Y=[Y;Y2];
end
fclose(f);
figure;
imagesc(abs(Y));
end
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