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foo_convolve - Impulse response convolver, 'Mother of all effects' plugin
kode54
post Jun 30 2003, 09:17
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Correction for previous request, I have no idea how the hell this would work, if at all.

Of course, I can see the relevance of summing stereo impulses of individual channels, perhaps for processing each channel with its own HRTF impulse. Of course, that'd be doubly slow for plain stereo... double again for 4.0...
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paradynamic
post Jul 9 2003, 00:25
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How does one go about converting Sound Forge impulse files (.sfi) to .wav format for loading in FB2K?
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kode54
post Jul 9 2003, 02:41
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Feed that unitpulse2k.wav through it. You can trim it down to the single pulse sample first, as the output will be extended to the full length of the impulse.
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Melomane
post Jul 19 2003, 14:29
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MIX ADJUST not work fine here.

Load impulse file, for exemple unitpulse2k
(because problem is very clear)

put slider to 0 %
play
sound isn't different from sound without convolver (fortunately...).

put slider to 100 %
sound no change (logically!)

put slider to 50 %
I can not explain in English what I hears but it is catastrophic!

same problem with all impulses files
foobar 0.667 and 0.7 b22

please, can you confirme if it is a bug or if i have a problem in my system?


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Messer
post Jul 19 2003, 15:20
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Melomane, read whole thread - I had the same "problem". Unitpulse is not really unitpulse (Dirac delta) but unitpulse plus const., so it works as delay filter.
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Melomane
post Jul 19 2003, 15:53
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Thank you Messer, now i understand.
i have use file from convolve.zip (0.6 foobar) and all are wrong.


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Messer
post Jul 19 2003, 16:13
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QUOTE (Garf @ Jun 27 2003, 09:14 PM)
I don't care what design mistakes other people made. You can do it by editing the impulse. There is no point to including it in the component.

Garf, just wondering...
If the impulse contains response that comes _before_ actual pulse (some pre-echoes etc.), then there's no way to compensate delay by editing impulse file only...
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kode54
post Jul 20 2003, 01:05
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There is also no way to compensate for that on output, unless you want to cut off the pre-echo of the first few samples.
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Garf
post Jul 20 2003, 14:26
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kode54 is correct. It's also reason why the included unitpulse2k is not a true dirac pulse, so effects that influence before the impulse have some 'room'. I noticed that otherwhise most effects aren't able to work well.

If you have an effect with delay and want to have a delayed wet/dry mix, work with the impulse in an external wave editor.
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Messer
post Jul 20 2003, 15:20
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Nah, that's not really a whining, I was just "thinking aloud" about possible situations where adjustable delay could be handy smile.gif Not that it's worth the hassle...
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tigre
post Dec 1 2003, 09:20
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Garf, in case you need some more whining as motivation wink.gif

Could you please, pretty please, look into adding crossmixing?


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Let's suppose that rain washes out a picnic. Who is feeling negative? The rain? Or YOU? What's causing the negative feeling? The rain or your reaction? - Anthony De Mello
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WaldoMonster
post Dec 29 2003, 00:23
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Where can I download the latest foo_convolve plugin?


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http://www.netjukebox.nl
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tigre
post Dec 29 2003, 01:24
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QUOTE (WaldoMonster @ Dec 29 2003, 01:23 AM)
Where can I download the latest foo_convolve plugin?

It's included in the special installer from Case's site or available at official fb2k components site.


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Let's suppose that rain washes out a picnic. Who is feeling negative? The rain? Or YOU? What's causing the negative feeling? The rain or your reaction? - Anthony De Mello
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WaldoMonster
post Dec 29 2003, 10:45
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QUOTE (tigre @ Dec 29 2003, 01:24 AM)
QUOTE (WaldoMonster @ Dec 29 2003, 01:23 AM)
Where can I download the latest foo_convolve plugin?

It's included in the special installer from Case's site or available at official fb2k components site.

Thanks for the links.
I couldn’t find it on http://fb2k-plugins.hydrogenaudio.org/


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tacitus10
post Jan 18 2004, 13:51
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I was wondering the processing pipeline of FooConvolver?

Is it:-

Impulse converts to 64 bit float and then is processed with what is in the playlist (which is also converted to 64 bit float).

ie:- 64 bit float x 64 bit float regardless of format the originals were in.

all processed using 64 bit float precision?

Also what happens when the samplerates do not match?
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Garf
post Jan 18 2004, 15:41
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QUOTE (tacitus10 @ Jan 18 2004, 02:51 PM)
Impulse converts to 64 bit float and then is processed with what is in the playlist (which is also converted to 64 bit float).

ie:- 64 bit float x 64 bit float regardless of format the originals were in.

all processed using 64 bit float precision?

Also what happens when the samplerates do not match?

All processing is in 32 bit float precision. (There is no quality advantage in 64 bits and it takes up more memory).

When samplerates don't match the samplerate of the output takes priority, and the impulse is treated as having that samplerate (so basically you want to avoid that unless you want to try to get some funny effects).
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kelesh
post Jan 30 2004, 11:46
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So does anybody have a good impulse for use with Sennheiser HD580's, an audigy 2 using kernel streaming, and pop/rock music? (weezer, red hot chili peppers, beck, cake, radiohead, etc) (and some classical/techno of course).
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Messer
post Jan 30 2004, 12:00
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QUOTE (kelesh @ Jan 30 2004, 12:46 PM)
So does anybody have a good impulse for use with Sennheiser HD580's, an audigy 2 using kernel streaming, and pop/rock music?  (weezer, red hot chili peppers, beck, cake, radiohead, etc)  (and some classical/techno of course).

Try UnitpulseDirac.wav.
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Garf
post Jan 30 2004, 15:17
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QUOTE (Messer @ Jan 30 2004, 01:00 PM)
QUOTE (kelesh @ Jan 30 2004, 12:46 PM)
So does anybody have a good impulse for use with Sennheiser HD580's, an audigy 2 using kernel streaming, and pop/rock music?  (weezer, red hot chili peppers, beck, cake, radiohead, etc)  (and some classical/techno of course).

Try UnitpulseDirac.wav.

Ahaha, touche!

The HD580 is great without equalization or impulses but sometimes the perfect lineariry does get boring. In those cases I kinda like "Tube Amps/Studer +6dB Updated" for a warmer feeling.
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Mhenckel
post Feb 2 2004, 09:04
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QUOTE (Garf @ Jun 25 2003, 03:06 PM)
This is what I tried. I made several restrictions, one that it was restricted to zero phase filters (no complex components), and that any boost was forcedly limited to 30dB (to prevent overamplification of noise). But even reversing simple equalization didn't work all that well. It needs further experimentation.

You need at more sophisticated approach for this.

Try DRC program by Dennis SAbrigion. It can be found at Freashmeat

Morten
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Pio2001
post Apr 24 2004, 14:30
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Is it possible to add support for one impulse response per sample rate ?

I use an impulse response in order to correct the equalization of my speakers, because the equalizer don't have a parametric section. But I have both 44100 Hz and 48000 Hz files in my playlist.

It would be nice if the convolver would use toto44.wav as impulse response when a 44.1 kHz file is played, and switch to toto48.wav when a 48kHz file is played.
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Paranoia
post Apr 24 2004, 17:31
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Exhibited *very* strange behaviour.

Upon first run with it, attempted to go into prefs, and it foobar crashed as soon as I click "foobar2000".

Removed *all* componets, and it worked fine. So i slowly added them all back in, and now it works fine. lol. *shrugs*

Steve


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Garf
post Jul 29 2004, 18:45
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QUOTE (Pio2001 @ Apr 24 2004, 03:30 PM)
Is it possible to add support for one impulse response per sample rate ?

I use an impulse response in order to correct the equalization of my speakers, because the equalizer don't have a parametric section. But I have both 44100 Hz and 48000 Hz files in my playlist.

It would be nice if the convolver would use toto44.wav as impulse response when a 44.1 kHz file is played, and switch to toto48.wav when a 48kHz file is played.
*


Shouldn't correct and easier behaviour be to resample the impulse response instead?
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Pio2001
post Jul 31 2004, 03:32
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I don't know.
If you know as a fact that it works (=produce the desired effect) it would be the easiest solution by far, yes, though some people might prefer having the freedom to choose their own resampler, or to record the impulse again.
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Garf
post Jul 31 2004, 12:09
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QUOTE (Pio2001 @ Jul 31 2004, 04:32 AM)
though some people might prefer having the freedom to choose their own resampler


That will be true to some extent, since I'd just use foobar's resampler services.
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