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Re: [ARSCLIST] Lossy compression losing quality (was Re: [ARSCLIST] Pristine Audio and the Milllennials . . .)



Steven C. Barr(x) wrote:
----- Original Message ----- From: "Howard Friedman" <hsf318@xxxxxxxxxxx>
Mike, you wrote,

3. Copying a digital file either loses nothing or fails; the exceptions
to that are exceedingly rare. That is, if the copy is not perfect then
the transfer will fail, usually due to the dreaded CRC error. There is a
tiny chance of dual failure which would permit copying a file with an
error, but that is negligible in practice.

Does that mean that ripping CDA format files from a CD to MP3 format on my
hard drive loses nothing?
No (or so I would assume!). When Mike said "digital file," he was
apparently referring to the digits that are used in order to play
a CD...not ANY digital representation of that content. Since one
of the reasons for creating an MP3 version of a CD's content is
to decrease the amount of storage room needed to store the file,
the MP3 by definition will not be as accurate in terms of being
a digital equivalent of a given analog source...one can't remove
bytes/bits from a digital entity without removing content (the
applicable question here is whether the content removal will
make an audible difference to human ears/brains...?!)

Already covered, but since that seems rarely to interfere with additional posts here:


There are no files on a redbook CD (CD-DA). Ripping is the term for translting the bits that are on such a disc to a file. In one post, I went through the reasons that a rip to WAV may not be an exact representation of the bits on the CD-DA. In others, the losses from compressing WAV (or equivalent) to a lossy format (such as MP3) were discussed - after taking into account the losses from ripping without compression.

Mike
--
mrichter@xxxxxxx
http://www.mrichter.com/


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