audio comparison

How to compare two a开发者_运维问答udio files to see the difference of them

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.

Load audio files with Audacity and you will see differences between audio signals:

Also in audacity you can do Frequency analysis of signals and compare spectrum of those two signals (menu - Analyze/Plot Spectrum...). You will get something like that:

Existing app :

http://technofriends.in/2009/03/06/audio-files-audio-comparer-helps-you-compare-audio-files/

Audio Comparer is a Windows desktop application for MP3, MP2, MP1, WMA, AIF, WAV and OGG audio files comparison. The program’s main goal is to find duplicate audio files and sort them in whatever way you want.

But maybe it's code libraries you are after?

If you just want to determine whether the two files are different, take an MD5 hash of the file data from each file and if the hashes are the same, the files are the same.