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What can I know from the spectrogram of mp3 and wav file

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Star Rats
Star Rats 2019-11-5
回答： Daniel M 2019-11-5
I have plotted the spectrogram for an audio in mp3 and wav file as shown in Figure 1 and 2 respectively.
Does it means that wav file has higher audible frequency range which is in brighter color while mp3 is in dark blue which has lower frequency?
Figure 1: mp3 spectrogram
Figure 1: mp3 spectrogram
wav spectrogram
Figure 2: wav spectrogram
Thank you.

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Daniel M
Daniel M 2019-11-5
It's difficult to say given that they are plotted with two different colorbar axes limits. Set them to be the same and you can verify it easier visually. Try
colorbar;
caxis([-200 0])
Do that for each plot.

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