[vorbis-dev] Difference between compressed & uncompressed audio?

Beni Cherniavsky cben at crosswinds.net
Thu Jan 4 00:24:51 PST 2001

Aleksandar Dovnikovic wrote:
> I would like is someone could give me a few hints on how to
> distinguish whether a WAV file is uncompressed or it was
> created by decompressing mp3 file - I usually could take a
> look at the file through Sound Forge and look if there is a
> freq. cut-off (usually above 16kHz) or if there isn't one -
> then I can easily tell by listening if there are high-frequency
> artifacts (common for mp3). Is there any other way?
If MP3 co/dec cycle was stable enough (I doubt that:) you could check
by encoding and decoding the WAV (i.e. passing it through the psycho-
acoustics again) and check if it changes much.  An original file is
supposed to change much more than an ex-mp3 file (which already has
things masked out).

Beni Cherniavsky <cben at crosswinds.net>
                 (also scben at t2,cben at tx in Technion)

  No, No! You're not thinking; you're just being logical.
                                             - Niels Bohr

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