audio comparison

Question

How to compare two audio files to see the difference of them

Answer 1

If you are interested in finding out if two audio files sound the same instead of comparing them on a bit level, then the term you are looking for is Acoustic fingerprinting.

There is a good Wikipedia article on acoustic fingerprinting explaining the process and it includes a whole host of resources, including a few free and open projects.

An acoustic fingerprint is a condensed digital summary, deterministically generated from an audio signal, that can be used to identify an audio sample or quickly locate similar items in an audio database.