Rockbox Development > Feature Ideas

[IDEA] (stereo) convolver

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cpu98:
Very basic signal processing all you know. ;)
EQ, reverb, hrtf, crossfeed, custom effect, and so on...

load two wav impulse files and then
l_out = (l_in * left impulse file's left ch) + (r_in * right impulse file's left ch)
r_out = (r_in * right impulse file's right ch) + (l_in * left impulse file's right ch)
(I could have messed up description above....)

May we see it in the future.

http://people.bu.edu/edlarson/stereoconv.html
that's foobar's stereo convolver plugin for reference.

or http://convolver.sourceforge.net
multichannel convolver for complex operation.

BdN3504:
You are aware of this feature, no?

cpu98:
Yes. I'm using that intensively since 2007.
If I had learned C, I would start something....

I'm dreaming of using kemar diffuse field equalized impulse that works great on the pc.
Would fft burden cpus much?

isanggon:
I think stereo convolver is very useful, too. If it applied to rockbox, it's one more reason to love rockbox!
But I think a lot of rockbox hardware have not enough processing power or memory to use that feature. :-\

raudonkepuraite:
"on a 300MHz Pentium II, the reported cpu hit is about 30% when convolving with such a filter." ::)
But i like the idea.

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