Matt Wall wrote:
> there would be a loss of quality, however in that
> "perfect" world where =
> it was all digital and no attenuation or any other
> interference at all, =
> going from your recorder/player to your other identical md =
> recorder/player since the ATRAC systems should be
> identical and should =
> attempt to compress the audio the same in all the same
> places the =
> recording's should not have a generational loss.
In the digital domain, it IS possible to make a perfect copy, but this is
not the issue. When the original audio PCM data is ATRAC'd, 80% of the data
is discarded, so the decompressed audio PCM coming out can be quite
different to what went in, but will sound quite similar. If this data is
then ATRAC'd again, the hardware does not *know* that it is dealing with an
already processed data stream, and tries to reproduce the data as if it were
an original full-spectrum signal, and this is the reason for the
generational loss. It could be possible to design an algorithm which always
reconsituted a compressed data set the same way, preventing generational
loss, but my guess is that it would sound worse than ATRAC, and most of us
would prefer to have better sounding first generation copies at the expense
of worse multi-generations.
simon
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