Removing Audio Hum
I'm using Vegas 8.0c. I've recorded some SD video, with a consistent background hum. Could have been gain level. What built in noise removal in Vegas might I try? Other options?
Jeff |
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If you can isolate the frequencies of your hum, try the parametric equalizer. The easiest is to export the audio and use a spectrum analyzer with a lot of bins (65000+). Find a section of room noise, or even just some silence in your conversation. Then, dial in the settings with a very high Q and at least -20dB of reduction. Another tedious and less accurate way is to use a parametric equalizer to find the hum. Set it's Q to 2 (low) which provides a wide response. Set the gain to at least +20 dB. Then, while monitoring,sweep the frequency around until you hear the hum get loud. Hone in on the frequency by progressively narrowing the Q . Usually, there will be more than one hum. Auto Gain control is bad in that it typically distorts the start of every loud sound after a period of amplified room hum. If you really want, add it in Post. |
I was hoping for something much simpler. In Camtasia for example, you choose a few seconds of the isolated noise, it analyzes it, and removes it from the entire timeline. So there are no noise reduction add-ins in Vegas that could do similar?
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The Sony Noise Reduction plugin does exactly what you said. However, it's a separate product. I believe it may come included with the current versions of Sound Forge, though. There are other addins that will do this. Do a search for izotope to see another option. |
Jeff, grab Audacity as it has a Noise Removal tool built into it.
It's not up to the quality of Sound Forge or Izotope but it is free. |
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Honestsly, I don't like the noise reduction for simple hums. The main problem is that a hum attenuation of -20 dB isn't enough to completely remove major hums and the coloration of the rest of the sound is quite audible. Yes, -20dB is an appreciable reduction, but I think that is just a parameter and not the actual reduction. Even though I have the noise reduction available, I much prefer the EQ method I described above. I removed a nice 120Hz hum from a recording last night that way. The noise reduction package is better for slowly changing hums with multiple frequencies. |
Sony's noise reduction plugin does not come with Vegas. As I mentioned, I believe is it now included with Sound Forge.
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The absolute best "forensic audio" program is Izotope RX. It has a number of truly excellent audio restoration tools. More often than not, the results from this program are nothing short of a miracle. iZotope RX - Complete Audio Restoration: Declipping, Declicker, Hum Removal, Denoiser, Spectral Repair, Restore, Remaster, Download |
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ALL GUIs should be this easy, AND they have this truly voodoo like approach to N.Redux. You can actually SEE the noise you want to remove. Grazie |
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Grazie |
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