linuxaudio.org

On 07/26/2012 07:04 PM, Julien Claassen wrote:

quoted text
> 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
> =-=-=-=-=-=-=-=-=-=-=-=-

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