Re: Apple Computer changes its name

["mdj" <mdj.mdj@gmail.com>]

bieling@terra.es wrote:
> mdj ha escrito:
>
> > Just? You have to burn the tracks to an audio CD, which in the process
> > loses the metadata (forcing manual re-entry) and causes considerable
> > drop in quality.
>
> I'm not sure about this. I think that the product after
> decompression/decodification (in order to play it) of a compressed (mp3
> or whatever) music file is the same sample rate / bit depth as the AIFF
> you burn into the CD, so where's the drop in quality ?

mp3 (and similar) compression methods use psychoacoustic models to
delete from the original source, information that is supposedly (or
relatively) imperceptible to humans.

Of course, this process is quite subjective, and there is a range of
different mp3 encoders that perform the job to varying levels of
success - although most are designed to perform best at either
relatively high or relatively low bitrates.

In many cases, just the decoding of the original encoded file results
in audible artifacting, and these artifacts are present in the
decompressed data you propose re-encoding.

Taking an audio file like the AAC encoded music on iTunes,
decompressing it, then re-encoding with a different encoder will
produce some "interesting" artifacts in the result.

You can test this yourself by doing a couple of transcode cycles using
(insert arbitrary encoder). The results "speak" for themselves.

Matt