FFT Phase Vocoder crackling

BLAIR · 2022-01-27T00:28:42+00:00

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Hey guys,

Trying to morph two sounds by taking the FFT amplitudes of one and combining it with the Phases of another. I'm using the FFT Macros by Robin Davies and am using the phase vocoder within the EzFFT as a reference. The sound is there, however, there are very distinct crackles everywhere.

https://soundcloud.com/freedownloadsofsongsyeah/problem

Second half is what it sounds like in ezfft's phase vocoder

The bits in red are where it crackles

I've tried changing the FFT Size, duplicating the modules and adding 180 degrees of phase to duplicate version, swapping the hamming windows to hanning, but to no avail.

When I change PartB a to PartA a, (red circle) I only hear sound A, but there is no crackles, vice versa when changing PartA ph to Part B ph. So the problem seems to do with the different phase and amplitudes. So you'd think it would relate to windowing, but from what I tried, nothing worked.

Any ideas?

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Tr97

tremolo artefact.ens

this is not an acurat simulation but just to get an idea what this sounds like

ANDREW221231

https://community.native-instruments.com/discussion/comment/5659#Comment_5659

haha simple yet effective demonstration. i would assume that using basically a rectangular window at 4x overlap would present its own set inverse set of troubles.. but in practice it works surprisingly well for partial tracking, seemingly making the tracking less likely to 'jump around', almost like it is adding some redundancy?? not quite sure how to think about that

Studiowaves

I used the slew limiter to prevent crackles from switching between waveforms with different phase relationships. It works ok by setting the slew time a bit slower during the transistion and ramp the slew time back to 0 afterwards.

Studiowaves

https://community.native-instruments.com/discussion/comment/3396#Comment_3396

Regarding the merge that was removed, it looks like an initialization thing. I believe it's a set 0 on startup. So if you have clicks or problems during initialization you may need to put it back.

BLAIR

https://community.native-instruments.com/discussion/comment/6243#Comment_6243

It's all working good now :))

Studiowaves

https://community.native-instruments.com/discussion/comment/6259#Comment_6259

Cool, working with events is tough sometimes. Everything can work fine then that one event doesn't take and all hell breaks loose. I had a problem that was so erratic I said screw it and used an audio input instead of an event input. For some reason the event input only worked 95 percent of the time. Maybe the computer gets an interrupt request or something.

BLAIR

https://community.native-instruments.com/discussion/comment/6418#Comment_6418

Made a meme the other day which I think you will like about this ahaha

colB

haha, it's funny because it is true... (except when it's not... then it's definitely not funny ;-))

Studiowaves

https://community.native-instruments.com/discussion/comment/6493#Comment_6493

Pretty funny.

Studiowaves

https://community.native-instruments.com/discussion/comment/6500#Comment_6500

No kidding, things can get out of sync if your not careful. Have you ever tried passing a clock into a main macro from a core cell, I haven't but it may give you trouble.

BLAIR

https://community.native-instruments.com/discussion/comment/3329#Comment_3329

Hey, what do you mean by intel files btw? Is that the .dll? Because that's the only file I get when I click DL from here https://www.jezwells.org/Computer_music_tools.html

KoaN

https://community.native-instruments.com/discussion/comment/9982#Comment_9982

On the page above the plugins you have "Other Vst plugins" and "Before you can use any of the plugins you need to install the files contained in this zip file in to the windowssystem32 folder of your computer"

These are the intel files.

So as i said on a 64 bit windows you copy those to "Windows/SysWOW64"

BLAIR

Thanks dude!

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