sonogram vs spectrum

["evertveldhuis" <>]

What are the differences between a sonogram and a spectrum analyse?

If for instance I would like to know if there are inaudible  
frequencies in my soundfile, like below 20 Hz and above 15 kHz.
I would use a spectrumanalyser so that I can see the frequency and 
the amplitude of the whole signal.

I haven't used a sonogram yet, but from what I have read I had the 
feeling it is some kind of fingerprint from a soundfile, but what 
does it show, energy, amplitude? And how does it relate to a spectrum 
analysis, what are the pros and cons?

Regards Evert



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