Most sound editors allow you to display FFT's and othe transforms either 
as Spectra or 2d sonograms.

Messy audio looks totally different to the original when you performa a 
frequency analysis - the Bass and the high end are Boosted by a huge amount.
When you look at the spectra it's amazing how most people have trouble 
telling the difference... I guess modern culture is used to overly 
compressed audio from teh radio ;-)

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On Mon, 25 Oct 1999, Leonardo Stern wrote:

> > It would be nice if such a program existed.  If it really could tell
> > which format sounded the best, it would in effect contain a perfect
> > psycho-acoustic model.  In reality, there is no perfect psy-model,
> > so if you find such a test program, it will only tell you which codec is
> > using a psy-model closest to the one used to measure quality in the
> > test program.
> > 
> > Mark
> > 
> 
> Let me explain what I want isn't a program that compares 2 codecs
> I want a program that analize the frequency response of a wav (ripped
> from cd) and a mp3 or other and display both response graphics
> 
> My mp3 x wma tests sadly say that wma is better quality in lower
> bitrates
> But I not have any kind of frequency analizer, I used a external
> equalizer and some people to help me
> 
> I encoded 4 types of music and always the wma sounds better even in 96
> kbps. But I want to do more tests with different coputers, comparing
> methods, musics, etc.
> 
> > --
> > MP3 ENCODER mailing list ( http://geek.rcc.se/mp3encoder/ )
> --
> MP3 ENCODER mailing list ( http://geek.rcc.se/mp3encoder/ )
> 

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