QUOTE(yogi @ May 27 2006, 05:13 PM) [snapback]52463[/snapback]
@mario_a
I dont want to identify any file - I want to check whether the wave file is indeed a wave file, or it has been converted to a wave file from an mp3. I think there should be some kind of a spectrum analyzer to watch the low frequencies which wont exist if the source is an mp3.
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I would look towards the high end frequencies actually since thats one of the few areas what mp3 optimises, in other words it removes frequences that the human hear would not normally percieve, if you dont see stuff after 18khz range chances are it may derive from an mp3. But this is highly dependent on what kind of
music you listen to also the year the music came out. Reasons being a lot of pop music is
compressed to sound louder on el cheapo systems as some marketing exec thinks they will sell better that way. This reduces the frequency spectrum somewhat compared to older recordings pre-90s for example. You would need to rip a CD for the smae label form approximately the same epoch in time and compare your known wav to the one you downloaded to get any idea whether its compressed or not and even then it would be 50-50.
Bottom line, get your stuff from trustworthy sources
🙂
Tools to do this, steinberg's wavlab is one, but that ain't free. Maybe cooledit or audacity have frequency analysis spectrum displays.