Don Capps wrote:
> Ummmm...you lost me there Larry. ATRAC is indeed lossy compression. A great
> deal of data is "thrown away" in order to fit it onto those tiny little
> discs.
ATRAC involves loss. But is it not compression per say. To really have done
ATRAC correctly, it should have been variable. That is some "files" will
contain more inaudible data than others.
A perfect ATRAC scheme would not predict the total amount of music that each MD
could hold. It would depend upon what was not needed.
This type of situation is really not that uncommon. A CDR claims to hold 650 MB
of data (minus that used for formatting). However if you use your CDR to back
up files using data compression, there is no way of knowing in advance how much
you can fit on a disc.
It will vary from disc to disc depending upon the compressibility of each file.
But ATRAC is bit wise reduction, not compression. It relies on the theory that
80% of the data on a CD is not needed to reproduce the music. By using an exact
ratio, they are not taking into account the variables of different music.
For example something recorded which does not have a significant difference
between the loudest passage and the quietest should be easiest to process with
the least amount of detectable difference between the original and the digital
copy.
These discussions can only be applied to digital transfers since. Analog
creates a much more complex number of variables.
Larry
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