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On Thursday 13 January 2011 19:48:38 Tom Szilagyi wrote:

quoted text
> On 13 January 2011 19:44, Brett McCoy  wrote:

> > Can you explain what the difference is here with 'stereo' and 'True

> > Stereo', as far as convolution reverb goes?

>=20

> Quoting the IR homepage:

>=20

> [...] IR supports so-called 'True Stereo' impulses. These are four

> channel impulses that describe a full convolution matrix (the four

> channels contain, in order, the convolution paths L->L, L->R, R->L,

> R->R).

Hm, that would then represent a stereo source in a virtual room recorded to=

 a=20

stereo sink. Nice.     Not.

What kind of purpose has this??? When I want reverb, I want to place the=20

source in a certain position (via pan for example) and get the reverb for t=

he=20

room with the source "at that position", not the reverb of a stereo-

reproduction of that source at another position, put into the virtual room =

and=20

recorded in stereo again...
The only places where convolution-reverbs make sense imho:

 1) Place all sources in short distance to each other compared to the virtu=

al=20

room. Then you have a mono-to-stereo (when you mix to stereo). This will=20

actually give good results.

 2) Use an impuls-response-package with several inputs for several position=

s=20

with each the stereo-output of the listening position. And the route your=20

signals to the different source-inputs depending on the position in the roo=

m=20

you want to give them. Gives better results then #1 but requires better=20

reverbs.

 3) Fold the ambient of your stereo-song played on a stereo system in the=20

virtual room and record it at another position. Sounds like fun, but works=

=20

reliable only when you use head-phones for listening. And is not worth the=

=20

computation time for music that is to be played on any system from high-end=

=20

stereos to mp3-players and mobile phones.
Have fun,
Arnold
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