[ILUG] SDMI initiative
Niall O Broin
niall at magicgoeshere.com
Thu Sep 28 07:49:23 IST 2000
On Thu, Sep 28, 2000 at 01:01:46AM +0100, Fergal Daly wrote:
> Not quite, a ripped CD track hasn't been compressed already. It wouldn't
> make a difference if the compression was lossless, but each time you
> uncompress and recompress you get further away from the original and could
> get artifacts coming through.
Good point - though as Colm pointed out it's a different kind of
compression, using psycho-acoustic models. However, JPEG uses a similar kind
of compression (psycho-visual model ?), discarding information that the eye
doesn't take much account of, but you will surely see the effects of
repeated compression/decompression with JPEG.
> It's the same as when you make a copy of a copy of ... with VHS tapes.
Not quite as bad - not so many analog steps involved.
> hassle for the mp3 algorithm. There's something called Macrovision which
> does this for video signals, it makes them virtually untapable, even though
Macrovision is about as secure as a plastic padlock - I imagine SDMI will be
a little tighter.
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