Old 03-19-2017, 10:34 PM   #1
DSHODGE
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Default Reaverb Deconvolve Issue

I've been attempting to use reaverb to create my own reverb Impulse Responses. The issue is when I deconvolve the recorded audio, with the test tone used, I end up with a final IR with a sine sweep audible in any audio sent through it. It is what you might expect if you didn't deconvolve the recorded audio. I have searched for hours on end and I haven't found any solutions. I've tried different sample rates, bit depths and test tone lengths, all with similar, but incorrect results. The 30 second sweep ended up with a 30 second IR that had decent early reflections but they were followed by several seconds of sweeping ambience. The 4 second test tone resulted in decent early reflections followed by a 1/2 note delay with 5 or 6 repeats. Not at all what the reverb actually sounds like. Some one please help, am I missing something? It seems like an issue with the deconvolve process. Could this be a bug?

Running Reaper 5.35 64 bit on Windows 10.0.14393 Dell Inspiron 3847 i7 4790 quad core @ 3.6 GHz with 16GB ddr3 RAM and a motu 16A interface with current drivers and software.

Sorry if this isn't the best place for this thread, but I can't figure out how to delete it now.

Thanks for any help

Last edited by DSHODGE; 03-20-2017 at 12:22 AM. Reason: More info added
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Old 07-12-2017, 08:26 AM   #2
farjedi
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Can't help as I'm looking for information on this subject, but I got bizarre results using it, couldn't hear a sweep just what sounds like a digital synth guitar feeding back. My sound design brain thinks it could be fun to mess around with that. But it's not behaving as it should and I got the same as you, whatever length test tone is the length of the de-convolved IR, which obviously isn't right.

Normally I would just use a spike to make pretty decent IR's but this thing I'm sampling the noise floor is a bit too high so I just wanted to see if a sine sweep deconvolution would help.

There doesn't seem to be much call for deconvolution software, voxengo is the only one I can think of and it's Windows only.
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Old 07-12-2017, 09:02 AM   #3
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TBH-the module just does not seem to work right-whichever way I've gone about it.Inconsistant results-and a severe lack of decent documentation or video tutorials on basic/complex uses.
It works,but it's just strange in practice.
Could do with a massive update {imo} and a decent reainspection from those 'in the know'.
May be put to better use here then I guess...
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Old 11-02-2017, 09:06 AM   #4
DSHODGE
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Default Any luck?

Thanks for the replies, I was wondering if either of you have solved this issue or tried again more recently? I'm going to try again, hopefully it's been addressed in the last few updates. If I have any different results, I'll post them here.
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Old 11-02-2017, 09:11 AM   #5
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I didn't know that ReaVerb can deconvolve. Yes you have to properly deconvovle, I use the one from Voxengo and it can be picky to get it to deconvolve just right - then I loaded that result into ReaVerb.
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Old 11-02-2017, 09:23 AM   #6
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I got it working at first try here, are you guys sure you are doing the whole process right? (Of course the thing that the impulse response is supposed to be coming from has to be unmodulated and not adding any new harmonic content into the sound etc..But those are well known limitations of convolution.)
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Old 11-02-2017, 09:32 AM   #7
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What is the process for deconvolving in Reaper - Too lazy to go searching if you guys have a link.
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Old 11-02-2017, 09:52 AM   #8
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Quote:
Originally Posted by karbomusic View Post
What is the process for deconvolving in Reaper - Too lazy to go searching if you guys have a link.
1) Generate test tone with ReaVerb. (The test tone and deconvolve features are in ReaVerb's File module.) Optionally you can have the test tone generated elsewhere.
2) Play and record/render the generated test tone through the device you want the IR from. (The recording/rendering probably should not have any of the dry signal from the test tone present.)
3) Invoke the Deconvolve option in ReaVerb. It will ask you for 3 files : The original test tone you generated in step 1, the file you got from step 2 and finally the IR file you want to save as.
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Old 11-02-2017, 09:57 AM   #9
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Thanks man - wish I had realized that before buying Voxengos.
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