From: "David W. Tamkin" <[EMAIL PROTECTED]>
> You aren't recompressing compressed data; you are compressing the
decompressed output of a previous compression. The various codecs have
overlap in what they consider expendable; they are not orthogonal to one
another.
David, I'm not sure exactly what you mean by the statement : "You aren't
recompressing compressed data; you are compressing the decompressed output
of a previous compression." As I understand it, in MP3 compression (as in MD
compression) data is thrown away...ie: lost forever. Hence the term "lossy
compression". The data thrown away in the compression process is gone, never
to be recovered again.
Now, I am aware that converting an MP3 back into a .wav file produces a VERY
large file similar in size, if not exactly the same size as the original
.wav file. But I was under the impression that this was accomplished by use
of an interpolative filter which essentially "guesses" how the file should
look when reconstructed. Am I wrong about this?
Now, as to what degree of compression occurs when that file is then rencoded
to MD, here I will have to confess complete ignorance. But I venture to say
that at least SOME additional data is lost, thereby compromising fidelity
that much further.
Don C.
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