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 Plot Spectrum 
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Post Plot Spectrum
Hello

Can someone explain me a bit what you need to know if an mp3 you own is of high quality (320) by using the plot spectrum in Audacity?

I have various mp3s bought through different stores but some of them sound like they are from a lesser quality.

thanks!

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Sun Mar 14, 2010 3:07 pm
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Post Re: Plot Spectrum
if you have windows, you can just right click the file, select properties (eigenschappen), select details and you can read the it there (bitverwerkingssnelheid)

if that is what you mean

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Mon Mar 15, 2010 4:23 pm
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Post Re: Plot Spectrum
I've noticed it along time ago. Now, what is an mp3? 0100000110000101100001110001010100 001111000110010011101010110100100001..... It is written in 0's and 1's, wich says that it is a coded tune. Wich can only be translated and played by an mp3 codec. The tunes are from the "highest" (for now) quality you can buy on itunes, beatport. etc... 320 kb of written bit-information per second. Now how big or small is that spectrum? Does it reach an higher or lower volume (dB). That is written in the mp3. Why you have to gain more or less. The quality is in some sort of the same unless it wasn't mastered so well (bad eq'ing, distortion). And probably not every producer uses the same mp3 converter.

How can you rewrite it? too difficult. If you are using traktor and or serato you can set and save the gain at right volume? I don't know, never didn't find how to do it... But traktor normally sets the volume of the mp3's at the same levels automatically. But doesn't work so good with dnb.
I rather have vinyl then mp3's because of this. I think it is more crap but cheaper and it still works. Mostly the largest group doesn't even notice only experienced listeners.

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Last edited by SerialT on Tue Mar 16, 2010 1:29 am, edited 1 time in total.



Tue Mar 16, 2010 12:44 am
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Post Re: Plot Spectrum
Image[/quote]

The frequency goes from left (low tone) to right (high tone). I can see a lower tone reach a higher volume (dB). This is only pure physics.

I don't know how to explain it but if you look how the spectrum is build up. You can see it is from good quality. Because of the smooth build up (you can still see the angles of the beams). And if you lower the bitcount per second, it would have got less and wider beams. And then you would have a lesser quality. And mathematically you can raise the quality eternally (adding more and smaller beams in the same space). But that would raise the bit-info per time-unit. Wich is unnecessary cause it is impossible to hear the difference.

Those beams are coördinated (frequency,volume). This data needs to be stored. The more beams, the more data, the bigger the file, the better the quality.

(Als je daar niet aan uitkomt. leg ik het volgende uit in het Nederlands. Uw y-coordinaten bepalen het totaal geluidsvolume van dat spectrum. Dit will zeggen wanneer uw oppervlakte van het spectrum kleiner word, uw geluidsvolume omlaag gaat. Dus elke frequency heeft een hoeveelheid geluid en het volledig spectrum, een totaal geluid. Dit hangt NIET samen met de kwaliteit van het liedje.)

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Tue Mar 16, 2010 1:22 am
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Post Re: Plot Spectrum
Clears up a bit but i think that image (which i randomly picked from the internet) is a sample or a recording from a instrument.

Going to educate myself in this one, crappy mp3s comparing with wavs or so.

Thanks for the good direction!

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Tue Mar 16, 2010 1:31 pm
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Post Re: Plot Spectrum
:lol:

(this is lolling is not refering to the question ;) )

For as far I know it's not too clear from the spectrum if it's good or bad quality (for sure you can't tell it by being smooth or things like that.. well at least that's what _I_ think)

Maybe you can compare the freq analysis from a crappy (64 bit) with a 320 one (same song) and find out what's different..

And the volume is no worthy parameter to tell if an mp3 is good or bad quality

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Tue Mar 16, 2010 4:42 pm
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Tue Mar 16, 2010 5:46 pm
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Post Re: Plot Spectrum
I think you're indeed confusing soundquality with sound volume (which is somewhere understandable), I've also noticed soundlevel differences in 320 mp3 files but just adjust it with the gains, then it should normaly sound quite equal without boosting your eq's, think for dj use this is a bit muggenziften :D

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