----- Original Message -----
From: "Sampo A Syreeni" <ssyreeni@cc.helsinki.fi>
To: "Michael" <saoluser@rhodesiscool.netscapeonline.co.uk>
Cc: <saol-users@media.mit.edu>
Sent: Monday, April 24, 2000 12:29 PM
Subject: Re: MPEG 4-SA for audio compression?
> On Fri, 21 Apr 2000, Michael wrote:
>
> >I am really not an expert in programming, so I couldn't do this
programming
> >you're talking about.
> >But basically I just want to find out what is the current state of
> >development.I need to find out about these things for my disseration.
>
> You should remember that automatic compression of arbitrary audio signals
is
> not likely to result in structured audio but AAC/TwinVQ in MPEG-4.
>
Is this already part of the MPEG4 standard?
> >As well I've seen some mpeg4 codecs out, at least for the MS Media
Player.
> >Is SA already part of this, or are these just video codecs?
>
> It is unlikely tat SA would be produced since the original data which is
> compressed by these implementations rarely includes anything which could
be
> translated into SA sensibly.
What about future posiblilities? What are your views on the paper
"Generalized Audio Coding with MPEG 4 Structured Audio" by Eric Scheirer and
Youngmoo Kim? Couldn't that be part of a MPEG4 codec in the future?
> SA is the generative part of MPEG-4 audio so it
> needs something like modular synthesis, tracker modules, MIDI files and
the
> related synthesis architecture they are meant to be played on or the
output
> of a dedicated, SA capable composing environment to produce. PCM audio
> should be coded with the wide band coding toolkit, which is a separate
part
> of MPEG-4.
So SA was really never meant to be used for PCM audio coding?
Thank you for your help!
Michael Koderisch
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