How to repair audio?

[kwyjibo99]

I have a audio file, wich seems to be canned (I don't know the exact technic term, because I'm Spanish, the effect is like to hear the sound trough a metallic tube)

Any idea of how to eliminate it? (I know how to do it if there was noise)

[jorel]

kwyjibo99,
you forgot to post the file type!
is wave,mp3,mp2...? (seems mp3 at low bitrate,don't?)

[kwyjibo99]

Well, it's a 128 Kbps MP3 file, but I think this is not important...

[jorel]

yes,is important!

i only got this problems with mp3 a long time ago
and was needed to confirm the source!
i think that you can't repair it,was encoded in wrong way(only my opinion),and i never see this type of problem with good restauration.
!

[kwyjibo99]

I think it's a consequence of reducing the noise level on the file...