Lossy after pitch correction

[Luap]

Hello everyone here.
I got one track (Holidays by the Beach Boys) from a bootleg. The pitch was off so I applied pitch correction in Sound Forge. When checking these files in Audiochecker, the original track checks out as CDDA sourced, but the pitch corrected track as MPEG sourced!
How can this be? Does the pitch correction really alter the quality of the audio, or is this a 'bug' in Audiochecker?
Thanks,
Paul

[jameskg]

It absoluetly alters it. That may be triggering the check to show positive - or you may have unknowingly re-encoded it when you saved it.

For sure, though, those auto-checkers are wrong all the time, so take it with a grain of salt.

[anazgnos]

I think you've posted a couple times about false positives in audiochecker, and it can only lead me to conclude that audiochecker is entirely unreliable about guessing whether a track is actually lossy. Better to check this stuff out yourself with a spectral analyzer.

Of course pitch correction will "alter" the audio in a file but there's no reason why it should cause it to "lose" any high frequency information.

[jameskg]

I think you've posted a couple times about false positives in audiochecker, and it can only lead me to conclude that audiochecker is entirely unreliable about guessing whether a track is actually lossy. Better to check this stuff out yourself with a spectral analyzer.

Of course pitch correction will "alter" the audio in a file but there's no reason why it should cause it to "lose" any high frequency information.

The lossy data compression has nothing to do with high frequencies. Some algorithms for making MP3s, etc, also apply a low-pass roll-off, but not all. iTunes, for example, has a fantastic MP3 encoding process, when set correctly, that doesn't roll off (well, maybe a hair below 20k).. you can still tell it is lossy by the abrupt chunks missing from the spectrum. That is still the best way to tell and I've never seen an automatic method that is fool-proof for that.

[Luap]

OK, thanks everyone for the answers. Audiochecker doesn't seem to be too reliable!
Can you guys recommend some good (free) software with a Spectral Analyzer? (I already searched on the internet but I didn't find a suitable one...)

[jameskg]

don't think there is... some of the stuff people post here using tegh free ones are just awful.. eye candy, not any good for analysis.

the one included with Cool Edit Pro 2.x (Adobe Audition) is great.. best I've seen in consumer software.

[AAR.oner]

Audacity is about the best as far as freeware goes

[PowerWindows]

Audacity is about the best as far as freeware goes

Yes, Audacity will do the trick.

http://audacity.sourceforge.net/

[lordsmurf]

I'd suggest this is one area where Audacity doesn't really excel. Try SoundForge for this exact editing/restoring issue.

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[freezer]

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