[vorbis-dev] vorbis-utils features ;)

[ben at slumber.dhs.org]

Perhaps a solution would be to run a noise gate on audio with "noisy
silence" before it is encoded, if the person encoding it wants absolute
silence in those places (as you said, it's subjective).

But most music I've heard doesn't have enough silence in it for this to
be that big of an issue..

-ben

On Thu, Mar 22, 2001 at 02:02:01AM -0500, Keith Wright wrote:
> > From: xiphmont at xiph.org (Monty)
> > 
> > > Conversely, if it is random, you don't have to model it precisely, 
> > > 
> > > Non-random noise (like the NASA ionosphere sample I posted earlier) 
> > > is trickier, 
> > 
> > You've hit the nail on the head.  How do you distinguish the two?
> > It's an NP-hard problem [at least] in the general case.  If it wasn't,
> > compression would be easy.
> 
> Now you are throwing around precise technical terms where they do
> not apply.  "NP-hard" is a description of computational complexity.
> But the problem is not that it takes a lot of computation to 
> tell good noise from bad noise, even an exponential amount of
> computation would not suffice because _exactly_the_same_
> sequence of samples may be of no interest to one person
> (because it is the sound of tape hiss between movements
> of his suite) but of vital interest to another person
> (because it is a recording of the output of some scientific
> instrument in which he hopes to find a pattern).
> 
> Compression is not computationally complex (in general),
> it is just hard to program.
> After all you hope to do it in linear time or streaming
> is impossible.

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