sound

how to get a 3D spectrogram plot? in terms of time, frequency,intensity for a audio signal, please someone help me,,, thanks,,,,,,,

Answer 1

[Wayne King]

Just use surf() with your time, frequency, and intensity variables.

   t=0:0.001:2;                    
   x=chirp(t,0,1,150);              
   F = 0:.1:100;
   [y,f,t,p] = spectrogram(x,256,250,F,1E3,'yaxis'); 
   surf(t,f,10*log10(abs(p)),'EdgeColor','none');   
   axis xy; axis tight; colormap(jet);
   xlabel('Time');
   ylabel('Frequency (Hz)');
   view(-21,38);