At 05:38 PM 8/27/99 +0200, Michel Jullian wrote:
>Thank you Giorgio for offering me such a wide range of options (just kidding,
>you've done a great job Eric, Giorgio et al, and I guess I've just put my big
>foot in it). Since I only discovered this fascinating SAOL concept a few days
>ago I necessarily know very little about it, apart from some quick reading on
>the net and trying out saolc and sfront, so please forgive my enthusiasm.
>
>Only allow me to respectfully submit that MP4-SA _as such_ should not be
>advertised as a lossless compression method as it is currently, for example cf
>figure 2 of :
>
>http://sound.media.mit.edu/mpeg4/sa-tech.html#compression
>
>Fortunately, one implementation, SFront, _is_ lossless (repeatable), as I hope
>many others will be ;-)
>
Probably I've been a little bit too rude...
To be correct, SFront is not an implementation of "compression" but of
"decompression".
Compression is process of building the bitstream, or coding; the other
one, which we are discussing about, is decoding. You cannot say that
MP3 is lossless because the same player always extract the same sound
from the same mp3 file. Anyway I agree that is possible to discuss about
these issues. Is it possible to extract from a recording or live performance
an instrument description and score such that I will not loose any information
when I code in SA ? Or I don't see things correctly ? Ok, SA is about
synthesis and processing...
>
>This I'm afraid I didn't quite get : why should I have low quality non
>normative parts ?
In fact it is not wise.
>Is there something low quality and non normative in
>determinism ? Does SFront have to give up determinism to be in the norm ?
>
Not at all. But I guess it depends a lot on the application. I imagine that a
deterministic video-game has a very poor quality indeed. Not interesting.
What about music ? I don't know, even if I am a (low quality) musician.
But in my list I didn't talk only about determinism (that affect only random
generators). If I remeber well you also mentioned spatialize, filters, etc.
There,
I wouldn't talk of determinism or not, I would talk of quality or not. The same
for interpolation, or effects. Please re-read my answer in this shape and
probably you will get it better.
Best regards (and peace, of course :-))
Giorgio
__________________________________________________________________
Giorgio ZOIA
Integrated Systems Laboratory - DE/LSI - EPFL
CH-1015 Lausanne - SWITZERLAND
Phone: + 41 21 693 69 79 E-mail: Giorgio.Zoia@epfl.ch
Fax: +41 21 693 46 63
__________________________________________________________________
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