Noise Redux again

Steve Mann wrote on 12/18/2005, 2:03 PM
I have Vegas 6, Sound Forge and Noise Reducer plug-in.

I've seen DSE isolate noise in a Vegas track, and in twelve and a half seconds, he's isolated and applied the noise reduction on the vegas soundtrack. By the time I've written down step one, he is on step thirty-five.

Can someone provide the workflow for this? I have a stage production with a bad mic that has a simple 60 Hz hum. I could just notch 60 Hz and the viewer probably wouldn't notice the hole, but isn't this the kind of noise that SF+NR are best at?

Thanks

Steve

Comments

JJKizak wrote on 12/18/2005, 2:40 PM
If your in Forge, do this:
1...Find a small area on the track that is just noise and highlight just a little bit. that's all you need. Open noise reduction pluggin and use defaults.
2...Click capture block on the lower left then click noiseprint block which is next to it.
3...Click preview block at center right to hear the difference then click select block at lower right.
4...Another menu pops up. Then select "all " which is the first selection. This selection determines how much of the track will be affected.
5...Click OK on the selection menu then click OK on the noise reduction menu and you are done.
6. If you use the redo noise reduction again in the edit pulldown menu make sure you remove the highlighted area from before prior as it will only reduce noise in the highlighted area.
JJK
TorS wrote on 12/18/2005, 2:46 PM
If it is as simple as that, the result using NR or the stacked filters you suggested might not be so different.
I do not recall the workflow in detail, and I usually employ NR in Sound Forge. But if you have several clips on the timeline and they are all affected by the same noise, you should do it in Vegas, applying NR as a track effect. The principle would be to add the effect once, feed NR a sample of the noise (a short stretch of the audio containing nothing but the noise - i.e. "silence"), and then apply the effect. You set it to record noise sample and click preview - having selected a short stretch for the purpose. Remember to change the selection to all audio (in NR) before you apply the effect. If the noise were more complex you would then add the effect again, take a new sample of the noise (after the effect of the first installment) and repeat procedures. You could go on, but you'd soon discover that the resulting audio is sounding not so good. The way to add NR several times is to use it sparingly every time; set it at a low dB reduction (like 8 instead of the default 12). Then the effect on the "good" audio will be less noticable. But you can not take away and take away forever and expect the remains to be unchanged.
Spot|DSE wrote on 12/18/2005, 3:16 PM
N19093, are you using Vegas or Forge? The workflow is slightly different.
JJKizak has given a flow for Sound Forge. In Vegas:
Apply NR to track. (you can also do non-realtime this same way, but I don't like to)
Select small area of just noise
open noise reduction, hit "automatic capture timeout"
This will select the noise area.
Now adjust the amount of reduction. As mentioned by others, use multiple passes, or rather, put the plug on the track more than once with various locations of noise selection. Remember to grab smaller, not larger selections.
Additionally, if you're de-noising dialog on particular, you'll want to likely use mode 3. Depending on the type of noise, you may find that sampling on a peak vs average works well too.
Steve Mann wrote on 12/20/2005, 1:12 AM
Vegas or Forge?

I was referring to the clip of the old guy on a porch that you applied noise isolation and reduction to from inside Vegas. I understood that the process was only available with Sound Forge and the Noise Redux plug-in for SF.

You say to "open noise reduction". Where do I find this? Did I miss something when I installed Vegas and Sound Forge?

Thanks
Steve
Spot|DSE wrote on 12/20/2005, 1:29 AM
Noise Reduction doesn't come with Vegas or Forge, unless you bought one of the Forge bundle deals that they had for a little while. If you have it, NR can be used in any application that supports DirectX audio plugins.
farss wrote on 12/20/2005, 1:34 AM
Best done in SF as you have it.
Ah but I see your problem, it's not a native SF thing so you have to look under... DX Favourites->All from memory.
I've got it and a few others configured as favourites so I don't quite remember the how to on a virgin install, suggest reading manual.
There's an aweful lot of power in SF and you do need to spend time with the manual to not only find all its tools but also to grasp its workflow.
Bob.
trock wrote on 12/21/2005, 5:43 PM
If it's a simple 60hz hum, a notch at 60 and a smaller one at 120 and smaller one yet at 240 (the harmonics) would usually remove the hum very effectively.