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Izotope Rx “Denoise” workflow issue
Hi,
I am using Izotope RX “Denoise” to remove background noise from interviewees speech. The interviews happened in offices and common background comes from air conditioner and lights that emit continuous sounds, plus the “electronic hiss” from the lav mic + recorder.
My “Denoise” workflow:
Preset: “highest quality, slow”
Algorithm: “A (real time)”
I select a section that contains only noise and “train/learn”.
I don’t change any parameter because of my lack of knowledge about audio (I am trusting on the preset).
Then, I just “process” the file.
The output is reasonable, but some noise remains.
Then I repeat same process (selection, train/learn, process). After double processing the noise is better removed, but some times the interviewee speech is affected badly. So, this double process not always work. Actually, I am not sure I should execute double processing.My workflow is quite naive! I would appreciate any tip about what should be an appropriate workflow through Izotope RX “Denoise” with most automation as possible. About the algorithm, what should be the best to remove the kink of noise I mentioned?
Thanks in advance,
Cadu -
6 Replies
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Always keep in mind that “less is better”.
In other words, only remove a bit of noise on the first pass (cut your settings in half).
Then try a second pass and maybe a third.
iZotope has several videos for this tool on their YouTube channel that you should check out as they’re very helpful. -
Hi Mike! Thanks for answering.
It seems the double (or even triple) process I was adopting is the way…
=> When saving the file, Rx provides three options (Dither Modes: None (Truncate) / White Noise (TPDF) / MBIT+).
I am processing the audio outside Vegas and then importing into it. Do you recommend/have preference on one of these modes?
Best,
Cadu -
Cadu, it’s been a very long time since I used the Denoise feature and I honestly can’t remember which of those options I used.
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There are tons of detailed tutorials available on
Youtube that you can learn a lot from.Steve Rhoden
(Cow Leader)
Film Editor & Compositor.
Filmex Creative Media.
1-876-832-4956 -
[Carlos Silva] “I don’t change any parameter because of my lack of knowledge about audio (I am trusting on the preset).”
The trick with any denoiser is to use several passes but only apply a little processing on each pass i.e., turn the Noise Reduction (db) down a bit. It’s set to 12dB, back it off to10dB or 8dB but process multiple times.
[Carlos Silva] “After double processing the noise is better removed, but some times the interviewee speech is affected badly. “
Make sure that you use the Output noise only option to check if you hear any of the sound you want to keep. In your case, if you check “output noise only” and you can hear your interviewee talking, back off the Noise Reduction (db) until you can’t hear them anymore. Then uncheck “output noise only” and process the audio. This will make sure that you don’t affect the audio you want to keep.
~jr
http://www.johnrofrano.com
http://www.vasst.com -
Thanks everybody for help on this thread!
I found a useful guide on audio restoration through Izotope RX:
https://izotope.fileburst.com/guides/iZotope_RX_Restoration_Guide_v_1.pdf
Best,
Cadu
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