Spectrogram with Three Signals

[yabby24]

I have three acoustic data sets z1, z2, z3 that are nx1 matrices. I would like to plot them in a spectrogram in Matlab. I am aware of the spectrogram function, but I am new to Matlab and unsure how three signals would work.

 

[aap2]

I think you would want to use the spectrogram command with a 256 window and 128 overlap. Then you use the hold command to plot the spectrums in the same graph.