Re: [LAD] Leslie and convolution

On 07/26/2012 07:04 PM, Julien Claassen wrote:
> Hello Flo!
> OK, I'm with you so far. So I suppose, that it is possible to
> process the IR of a time-variant system. The question is: Is it done
> in any library already optimised for the audio domain?
> Thanks and best wishes
> Julien
>

I sense a misunderstanding. With a single constant kernel you can only
model time-invariant systems. A Leslie is NOT time-invariant. I.e. the
response changes with time (the speaker rotates). So what you could do
as a workaround would be to get IRs from the Leslie at various
positions. Then convolve your input signal with each of them and mix the
outputs together with the mixing coefficients being a periodic function
of time.. You could probably get away with calculating only a few of the
convolutions if your mixing coefficients are sparse, i.e. you only
crossfade between two consecutive (in time) output signals.. (keep in
mind the window length of the convolution kernel, though)..

It's of course a tradeoff - You need quite a few IRs to make the
transitions smooth.. But then it's just a matter of hacking some code
around an existing convolution engine..

But this could be done with shelf solutions

Flo

> =-=-=-=-=-=-=-=-=-=-=-=-
> Such Is Life: Very Intensely Adorable;
> Free And Jubilating Amazement Revels, Dancing On - FLOWERS!
>
> ====== Find my music at ======
> http://juliencoder.de/nama/music.html
> .....................................
> "If you live to be 100, I hope I live to be 100 minus 1 day,
> so I never have to live without you." (Winnie the Pooh)

_______________________________________________
Linux-audio-dev mailing list
Linux-audio-dev@email-addr-hidden
http://lists.linuxaudio.org/listinfo/linux-audio-dev
Received on Thu Jul 26 20:15:02 2012