[linux-audio-dev] cool plugin from Waves

[Jens M Andreasen]

On fre, 2005-02-04 at 22:09 +0100, David Olofson wrote:

[...]
> > I think this method will not catch the mild doppler effect arising
> > from turbolence? (.. nor the *wild* turbolence, if house is on
> > fire!) 
> 
> I guess not, because that's kind of equivalent to the room changing 
> shape all the time, I think - and you can't capture that without a 
> constantly "morphing" impulse response. No idea how you would go 
> about recording something like that, though.

Neither do I .. and I think it would literally take forever. But since
the wigglings and wobblings in the reverb-tail are all slight variations
on a common theme, I might like to try some of the following:

Use a 'wobble-generator' to crossfade between two (or more) samples
taken at different locations.

Cheat and 'Wobble' the input and 'wiggle' the tail slightly.

> 
> I *do* have an idea about what kind of problems that would pull in, 
> though: It would be like looping a sampled waveform, except each 
> sample is an impulse response... So, you need a nice, click free, non 
> repetitive sounding loop. :-)

Good thinking!

Click free loop can be automated.
Quantifying 'nice' is harder ... 

Non repetitive ... Say we morph between two 'nice' loops:

 Loop A is 2.00 seconds
 Loop B is 2.71 seconds 
 Crossfade 3.14 seconds (full circle)

... then we would get in the right ballpark for a simulation of the
sameness, though everchanging sound of complex sustained notes. 

This is for the sustained part though, and might not translate verbatim
to the decay of a room?

[...]

> This is a well known way to "cheat" to save cycles.

Or perhaps it is:

A simplified model of a rooms characteristic decay combined with a
simplified model of the turbolence, sounds better than without the
simplified turbolence.


In a parallel universe it could argued that, a speech-synthesizer
singing 'Lieder' is much more convincing if you have the appropiate
Bontempi Piano to go along with it.


-- 

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  c[]  //  Jens M Andreasen