> This is my point: CD-DA sampling makes the data smaller, and you can get
> the data back with negligible loss (at least that is what most people
> think). By your own definition, CD-DA is a form of compression.
You stripped away my and someone elses original point, modern dat
compression is strictly in the digital sense of the word, Analog data has no
specific size, yes on a 60 min tape exactly 60 mins of audio wil go on, but
if you speed up the tape less will go on, in a digital world no matter how
much you speed up the bitstream still only the same data wil go in n bits.
compression is a technique to fit data in a smaller number of bits.
> | ZIP is merely a bitwise reduction, it takes note of all data and try's
to
> | remove all redundancy, ie merely a bitwise reduction...
>
> Well, no. ZIP transforms redundant data into a code. This is traditional
> data compression. ATRAC and MP3 remove what they perceive to be
> insignificant data. This is bitwise reduction.
But that is compression too... in a matter of fact someones original
statement is true, anything you'll do to make it smaller is a form of
compression as long as you get the same or mostly the same back when you
decode it again... So resampling at a lower rate for instance is not a
compression as you don't get the original data back. ADC is not a
compression as there is no way you can measure the size of a analog
recording in bits. It is a conversion, you get something else back as what
you put in hence ADC, Analog to Digital Conversion.
JPEG is a compression too, and all it does in principle is leave a lot of
color data out of the picture as the human eye is more sensitive to contrast
and brightness then coloring.
ATRAC does the same, but instead of leaving colordata out it leaves masked
audio data out.
Bye, Remko van der Vossen
[EMAIL PROTECTED]
The Black Angel [EMAIL PROTECTED]
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