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Using Izotope RX to repair noisy audiofile
Okay if moderators suggest I take this one to the sound section I will race off their immediately. I am posting here since my original postings were about getting help with Noise issues in Vegas.
I am test driving Izotope RX’s demo model. I have an outdoor file with natural bird sounds and a bit of slight breeze. But this is a warm day in Australian desert so real real quiet except for UNWANTED camera hum.. Here is my issue:
When I import this file into Izotope it is such a quiet file that I cant even hear it well enough to demark what is present as far as sound. I didnt notice any kind of volume control at all in Izotope.
Please see below:
So because I am new with the program I found one way to overcome this. In Vegas take the sound clip and use the Switches/Normalized function. Now of course I can hear everything perfectly in Izotope. Please see below:
Of course this creates a couple of questions:
1. I can work with switches normalized in Izotope but when I drop these into Vegas I am going to have to minimize the height of these sound clips or use an audio envelope to adjust or duck them. Will this cause degradation of my audio?2. What do others who use izotope do when they have a very very quiet file but with camera hum that they want to get rid of while using this program? I cant take the hum out if I cant even hear the other sounds in the file! I am prepared to Normalize in switches for all audio files in order to work with them in Izotope but would prefer not to.
Any suggestions would be extremely helpful.
Don Kimball
Polytelis Media -
9 Replies
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Don, you are definitely doing the right thing.
I normalize my audio files in Sound Forge before using RX on them. You can do the same in Vegas. In fact, RX is also a plug-in for Vegas and Sound Forge so you can use it both ways. You’re not degrading the audio at all. You need to first get the audio up to a volume that you will use in the video and then use RX Denoiser to eliminate the noise you don’t want.
Just highlight a small section of the normalized audio that is just noise and use the Train button in the Denoiser to tell RX “this is noise!”. Then move the cursor to the beginning of the file and press the Preview button to hear the reduction in noise. You can adjust the Noise Reduction slider but I wouldn’t push it past 12dB. if you need more than that, run RX several times to get more reduction. When you are happy with the results, render the file and add it as a take to your audio in Vegas.
~jr
http://www.johnrofrano.com
http://www.vasst.com -
John thanks so much for your help and initially izotope looks like a great help. When you render in Vegas do you create MP3 files or what extension do you use before you then open the finished file in Izotope rx? I have been experimenting with .avi files (naturally no video attached) and MP3. Are some extensions better than the other?
I have only a trial version so unfortunately cannot save my work using the programs de-noiser. In the attached file I wanted to get rid of camera hum especially at the beginning of the file. It would be fantastic to be able to save my work and drop it next to the video file to see if this will do a good job. Hearing is one thing marrying it to the video is another. If it does a good job I have lots of audio clean-up I would need to do.
Anyone want to give this one a go and send the de-noise result back to me? Would be much appreciated!
Don
See attached MP3 file.
http://www.polytelismedia.wordpress.com
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Don, you can use RX’s Gain function (Process -> Gain) to change levels of your file.
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When you render in Vegas do you create MP3 files or what extension do you use before you then open the finished file in Izotope rx?
Never use MP3. This is highly compressed and will contain compression artifacts that will add to the noise. Always use WAV files. They are uncompressed and will not loose any quality regardless of how many times you render them.
Here is your audio file with three passes of iZotope RX Denoiser at 12dB:
665_664wacarnabyscleanrx.mp3.zip
~jr
http://www.johnrofrano.com
http://www.vasst.com -
thanks John
I noticed that in the file you sent there is an “underwater gurgling” that happens before the cockatoo cries in the clip. I noticed this as well if I clean up the file to make it squeaky clean and totally free from unwanted hum. Any thoughts on this one?
Thanks!
Don
PS: Thanks for the major heads up on .wav files vs. mp3
http://www.polytelismedia.wordpress.com
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I noticed that in the file you sent there is an “underwater gurgling” that happens before the cockatoo cries in the clip.
Yes, I heard that too after the third pass. This is what happens when you use too much reduction on one pass. I was just processing that quickly before I left for work this morning. I only spent a few minutes on it.
What I would do to eliminate that is to use less noise reduction but take more passes. For example, set the noise reduction at 6 or 8dB and make several passes until you are happy with the quality. Between each pass, take a new noise sample with the train button. There is also several algorithm settings. I just used the real-time A setting but B and C (which is off-line processing) may give better results. You definitely have to experiment a bit.
~jr
http://www.johnrofrano.com
http://www.vasst.com -
Thanks Alexy. Is this in conjunction with what John recommended in dealing with my unwanted noise? Or do you try this instead?
Thanks!
Don
http://www.polytelismedia.wordpress.com
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Hi, I seem to have tried a lot of methods to reduce the noise from an Indian music wave file.
Can I send the file over in any format so that you can hear for yourself and see if thete is something that can be done ? -
You should probably post the file here. There is an upload button (diskette icon) above the message area that will allow you to upload a file.
You also probably should start a new thread when you do so that more people will see it.
~jr
http://www.johnrofrano.com
http://www.vasst.com
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