[DC LoCo] /. News: Apple's Lossless Audio Codec (ALAC) Now Open Source

Eric Maag eric.maag at gmail.com
Fri Oct 28 20:19:07 UTC 2011

So how does this compare to say redbook or .wav?


On Fri, Oct 28, 2011 at 2:16 PM, Kevin Cole <dc.loco at gmail.com> wrote:
> And, to belabor the explanation a bit further via analogy rather than
> total accuracy:
> Let's say you have a phrase like "the lazy brown fox did not jump over
> the lazy brown dog's back."  A lossless compression could analyze it
> and note that "the", "lazy" and "brown" occur multiple times.  So it
> recodes as something like "[1=the, 2=lazy, 3=brown]1 2 3 fox did not
> jump over 1 2 3 dog's back."  The part in brackets [...] is the
> encryption key or hash table, and the rest is the encrypted message,
> or hashed message.
> A lossy compression may determine that "the" is "mostly noise" in the
> signal, and can be eliminated entirely or shortened to "a", or that
> "did not" can be contracted to "didn't" without bothering to record
> anywhere that these changes were made to the original.  In the case of
> eliminating or replacing "the" with "a", the listener / reader may
> very well notice the change.  On the other hand, hearing or reading
> "didn't" in place of "did not" is less likely to be noticed by the
> casual listener / reader.
> A crude analogy, but hopefully illustrative.
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