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Author Topic: Izotope RX: Difference between tonal and bandwidth filtering (Denoiser)?  (Read 3249 times)

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I've read through the manual for the denoiser and I've read the descriptions, but I can't quite wrap my head around what the difference between these two are and what situations I'd increase the filtering of one over the other for. Any examples or explanations are appreciated. Thank you.
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Offline DigiGal

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Re: Izotope RX: Difference between tonal and bandwidth filtering (Denoiser)?
« Reply #1 on: January 07, 2011, 05:27:18 PM »
Don't have an answer, sorry, just a comment.

I downloaded a free trial of the new version but haven't given it a workout.  It actually looks like too steep a learning curve to deal with for the short trial period.  I was essentially considering it to use as a plug in for noise elimination.

How do you like it?

No rush but thinking of trying sound soap instead, not as powerful not even really in the same league but appears much easier to use. 
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Re: Izotope RX: Difference between tonal and bandwidth filtering (Denoiser)?
« Reply #2 on: January 07, 2011, 05:34:54 PM »
How do you like it?

Well, just got it last night, so I'm still working through it. What I can say is this:

1) You get VST, AU, and on the mac, a standalone app which is nice since Audacity won't route audio properly.
2) I already had Ozone and loved it so I'm biased.
3) From the above, Ozone doesn't have the resample algo, but this does.

What I can milk out of the simple NR is better then I was getting out of Audacity, but not by much, that's why I went to the advanced tab.
"This is a common practice we have on the bus; debating facts that we could easily find through printed material. It's like, how far is it today? I think it's four hours, and someone else comes in at 11 hours, and well, then we'll... just... talk about it..." - Jeb Puryear

"Nostalgia ain't what it used to be." - Jim Williams

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Re: Izotope RX: Difference between tonal and bandwidth filtering (Denoiser)?
« Reply #3 on: January 08, 2011, 04:04:21 PM »
I'm no expert in RX so I can't really say what the difference is with broadband and tonal filtering. The only thing I do occasionally is unchecking the box "link tonal and broadband controls" and then preview the sound using just tonal or broadband. Tonal doesn't seem to make much of a difference in my type of recordings... (nature recordings)
I have to admit that I haven't really explored it yet, so I'm also interested if someone has some advice to when you should use tonal and when you should use broadband noise reduction.
I do use the envelope curve in advanced tab to "point" the reduction to where I want it most, by setting out the nodes so I don't reduce as much where the interesting sounds/frequencies are.
I'm using RX2 by the way.

To DigiGal: You can use the Simple tab and just highlight a noise area and click "learn" and then just set the amount of reduction you want. Easy and fast.
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Re: Izotope RX: Difference between tonal and bandwidth filtering (Denoiser)?
« Reply #4 on: January 08, 2011, 04:59:49 PM »
I'm no expert in RX so I can't really say what the difference is with broadband and tonal filtering. The only thing I do occasionally is unchecking the box "link tonal and broadband controls" and then preview the sound using just tonal or broadband. Tonal doesn't seem to make much of a difference in my type of recordings... (nature recordings)
I have to admit that I haven't really explored it yet, so I'm also interested if someone has some advice to when you should use tonal and when you should use broadband noise reduction.
I do use the envelope curve in advanced tab to "point" the reduction to where I want it most, by setting out the nodes so I don't reduce as much where the interesting sounds/frequencies are.

In many ways, I'm doing the same (and getting similar results). I favor the curve and then use the broadband NR.  :-\

One thing I did get from re-reading the manual was that broadband is when you have trash across a large swath, so I'm inferring that the tonal is when you are getting like a 200hz hum without resonances that you want to eliminate.
"This is a common practice we have on the bus; debating facts that we could easily find through printed material. It's like, how far is it today? I think it's four hours, and someone else comes in at 11 hours, and well, then we'll... just... talk about it..." - Jeb Puryear

"Nostalgia ain't what it used to be." - Jim Williams

Offline ironbut

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Re: Izotope RX: Difference between tonal and bandwidth filtering (Denoiser)?
« Reply #5 on: January 09, 2011, 05:27:23 AM »
I've been using Rx for a while but I don't really use the Denoiser module that often. If you're trying to quiet crowd noise during quiet sections like at the beginning of a track you're better off adjusting your fade in and then using the Denoiser or Attenuation module in the Spectral Repair. The best thing for this is an adjustable envelope for this if that's included in your DAW/editing software.

The Tonal filtering adjustments are only there if you need it. Most of the time I just tick the broadband setting and if the result has tonal noise as a result of the processing, I try again with tonal noise reduction ticked. Just like the manual says, tonal noise is a watery/chirping sound that needs to be filtered out.
 It's a little confusing (at least it was confusing for me). The tonal noise is the result of the noise reduction or rather it's what's left after the broadband filtering is done. If you try and remove noise that contains too much tonal/musical elements, the software will think that the tonal content is something that you don't want to remove and leave much of it behind. The trick here is to realize that stuff like chatter contains lots of tonal elements. Otherwise, we'd all sound like robots when we talk. So, when you ask Rx to remove nothing but broadband noise, it does it's best to remove just that. Quite often there's going to be some tonal elements there too and after any broadband elements are removed, all that's left sounds like chirping and watery sounds (which are the inflections we add to the words we speak to add emotion or anything else that's remotely musical).
There may be a way to use the Denoiser to remove something like the hundreds of voices of folks chatting before the music gets going but I've never had much luck with it for that sort of thing. What it's really good for is stuff like surface noise of an lp or a constant noise like an air conditioner. What I've found with live concert recordings is that it removes too darn much so the acoustics are lost and the recording sounds dead. But, like I said, I haven't really tried it enough to be certain.
I really love Rx but it has a long learning curve. I've logged a lot of hours on it and sometimes, I still feel like a total beginner.

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Re: Izotope RX: Difference between tonal and bandwidth filtering (Denoiser)?
« Reply #6 on: January 09, 2011, 12:30:05 PM »
Yeah, I agree, its not designed for what most tapers consider noise. Im trying to isolate the vocal off of sbd feed and ditch stuff like the crunchy faux room reverb that the sbd put out. Whats seemed go work best is layers of deconstruction and then denoiser and back to deconstruction. In lower db ratings it seems to appropriately catch what I want to junk, but (expectedly) goes haywire past about 9db of reduction.

The spectral view and magic wand tools are abfab. :)
"This is a common practice we have on the bus; debating facts that we could easily find through printed material. It's like, how far is it today? I think it's four hours, and someone else comes in at 11 hours, and well, then we'll... just... talk about it..." - Jeb Puryear

"Nostalgia ain't what it used to be." - Jim Williams

 

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