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Old August 7th, 2007, 06:56 PM   #1
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Removing HVAC noise?

I didn't notice it while recording, but it is clearly audible on the recording. Sounds like wind noise or a low rumble. I believe it was caused by the HVAC system in the room.

I've tried the various filters. Bandpass seemed to work the best, but reduced the overall sound too much.

I'm using PP 2.0

Thanks!

Last edited by Ming Dong; August 7th, 2007 at 08:29 PM.
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Old August 8th, 2007, 09:19 PM   #2
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using on camera mic? or seperate?
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Old August 9th, 2007, 02:05 AM   #3
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Hi Ming,
The best solution would be to filter the sound in another program (a sound program, like audition, soundforge, etc).
There you can take a sample of the noise and play with the frequencies with a parametric equalizer to see which freq zone/s work/s the best. Then you can try that settings in your sound and make the final adjustements.
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Old August 9th, 2007, 05:19 PM   #4
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I was using an AT897 in a "live" room (bare walls/floor)
Audition seems like overkill for me since I don't do music. Is it that much better than PPro at reducing background noise?
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Old August 9th, 2007, 06:25 PM   #5
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Hi Ming,

You really need a noise reduction plugin to do this right. EQ can help, but it can also remove part of your real sound too.

Check out the Waves and Bias products on this page:
http://www.sweetwater.com/c713--Plug...oise_Reduction

They work by analyzing the room sound (when no one is speaking) and learn the pattern of the noise. They use different techniques, but the idea is that they can remove the room sound without dramatically altering your voice quality.

Another thing to keep in mind is using a bit of eq and then putting some music underneath will mask the sound enough so it might not be a problem. Try cutting the low frequencies from around 75-80Hz and below. That will remove some of the rumble. Depending on your use for this project, the noise might blend into the room it's being shown in. Using fades on both ends of each of the audio clips will help avoid an abrupt start/stop to the noise, which will help cover it up as well..

Eric
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Old August 10th, 2007, 10:03 PM   #6
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Adobe Soundbooth is great for editing out this type of problem with your audio...

go to this Adobe site

http://www.adobe.com/designcenter/video_workshop/

Navigate to the Soundbooth application and chose the tutorial "Cleaning and restoring audio" , then hit the play video button (bottom right side)

The author shows how to eliminate the noise your asking about....
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Old August 11th, 2007, 04:58 PM   #7
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Quote:
Originally Posted by Ray Bell View Post
Adobe Soundbooth is great for editing out this type of problem with your audio...

go to this Adobe site

http://www.adobe.com/designcenter/video_workshop/....
Wow, that link is a great resource

And that video is an impressive "commercial" for Soundbooth. I'm sold!

Thanks!
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Old October 8th, 2007, 01:04 PM   #8
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Sorry... wrong forum...
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Old October 8th, 2007, 01:10 PM   #9
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Hey Kevin, you could try some variation of this search:
http://www.google.com/search?num=100...ac&btnG=Search

That should get you started. If you'd like, I can remove the noise from your audio for you, if it's just a one-time deal, for a fair price.

Eric
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