quoted 11 lines I know mp3's are of lower quality than cd audio due to compression, but
>
> I know mp3's are of lower quality than cd audio due to compression, but
> why does converting mp3's back into cd format destroy even more quality?
> What exactly are you losing? More of the dynamic range? And would it
> make a difference, say, if you converted mp3s into wav's first, like in
> Sound Forge, versus letting a burning program like Nero do the
> conversions for you? I just had never thought about this before. But I
> suppose it could be similar to digital photography and the more you
> re-save a file in different formats the more quality you lose (which
> primarily has to do with each file types compression algorithm, I
> believe).
converting mp3s back to audio CD forrmat (16bit PCM stereo) will not
destroy more quality. however, MiniDisks are not audio CDs, they use a
compression similar to MP3. converting between these formats looses
some more quality because the encoded files can not be transcoded
(AFAIK) but have to decoded and re-encoded. (even if transcoding is
possible some quality will most likely be lost in the process).
about converting MP3s back to 'CD' format: if the decoder used is of
recent release date (lets say in the last two years) you should be on
save side. AFAIK Nero uses the Fraunhofer decoder as does SoundForge.
your comparison to digital imaging is correct, mp3 compression can
very roughly be compared to the JPG compression: the sampled
information is converted into another domain (frequency domain for
MP3, cosine domain (if that the right word) for JPG) then the
information is reduced (quantized, this is where the quality is lost)
and entropy encoded/compressed (something like ZIP or RAR, no
information is lost here).
the way the information is reduced (quantized) decides about the loss
of quality and for which purpose the format is suitable.
I hope that was not too boring :)
quoted 10 lines -----Original Message-----
> -----Original Message-----
> From: cerebral.ap0plexy@gmx.net [mailto:cerebral.ap0plexy@gmx.net]
> Sent: September 16, 2003 1:32 AM
> To: idm@hyperreal.org
> Subject: Re: [idm] OT: MP3 player-suggestions?
>
> .....my recommendation is a portable CD player that supports MP3
> playing.
> that way you dont have convert your mp3s (which destroys some more
> of the little quality left anyway).....
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