On Fri, 02 Jun 2000 09:05:01 -0700 Dan Frakes <[EMAIL PROTECTED]> wrote:
> >some peices. However..the compression systems are getting better all
> >the time. I think all this only applies to recordings you make yourself
> >though...
>
> Nope, it applies to pre-recorded MDs as well. An MD still has the same
> capacity, whether pre-recorded or "made at home," so it is subject to the
> same limitations. What Sean said about the differences between classical
> an "other" music is for the most part correct, though. It's more
> difficult for MD to compress classical music without losing very audible
> parts of the content.
yeah..I'm only spewing stuff that I've read from other places, so forgive
me if I'm just perpetuating lies LIES here.. erm.. it gives me a misguided
(and incorrect) sense of importance.. ANYway..
Whilst I would have little technical comprehension of how discs could be
coded differently yet still read on the same machines, surely this is what
is happening? I mean, how can manufacturers have different ATRAC systems,
and release different versions of them with new MD models, and yet the
discs can all be read by any MD machine (well..supposedly)? Isn't this
something to do with the way that ATRAC bit allocation assigns varying bits
to blocks depending on the complexity of each..er..part (you can tell I'm
floundering here, yes?)?
I've just picked up this info on this site..
http://www.minidisc.org/minidisc_faq.html#Q5
13.Does ATRAC have "forward compatibility," or is it a static
algorithm? Does the ATRAC version affect the quality of the
recording or the playback?
The encoder (recording) side of ATRAC offers room for improvement
from one generation to the next (specifically, in the decision
about how to allocate encoding bits so as to best match human
psycho-acoustic properties). Thus, MD recordings made on a newer
machine with a better ATRAC encoder will sound better than old
recordings, even when played back on an old machine.
The decoder (playback) side of ATRAC has a fixed structure, and
though ATRAC chips are all generally expected to decode with nearly
the same quality, increases in digital signal processing accuracy
may allow slight audio quality improvements (if those improvements
have not already been made to modern ATRAC chips).
Endofquote
Doesn't this mean that if you recorded some classical music from a CD
(say) using second generation ATRAC, and then you bought a pre-recorded MD
of the same music which had used 3rd generation coding, that the latter
would sound better, regardless of which ATRAC the player had on board?
HELP!
Sean.
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Sean Buckingham
Media Services
Brunel University, UK
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