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Subject: Ideas about removing wind noise from long file?
Posted by: D'Anne
Date: 9/16/2013 5:47:26 PM

I have a video clip 30 minutes long with a good amount of wind noise. High level, Very Low Freq, no real harmonics. I can do it manually, one burst at a time, but would like to process the whole 30 minutes at a time. Any ideas? Any way to script this thing?

I was thinking to do a reverse noise reduction process. Use the regular noise reduction process to select all of my real content as noise (it is lower in volume and higher in freq), and after it does that, reverse the phase of both layers to end up with my desired content alone.

Any help? or other ideas?

Subject: RE: Ideas about removing wind noise from long file?
Reply by: D'Anne
Date: 9/16/2013 9:13:24 PM

Removing the low end wind 'rumble' was easy. Just removed everything below 250 Hz. There weren't any really deep bass voices so the quality is still good.

There is some higher frequency wind noise that I will try to tackle next. Will start out using the standard noise reduction technique.

Subject: RE: Ideas about removing wind noise from long file?
Reply by: Sneddy
Date: 9/16/2013 9:13:49 PM

I bought SL (v1) to do this and haven't a clue how to do it. If you find a way, could you post your result? I just bought Waves WNS to tame severe wind and it did a reasonable job. When using laptop speakers, you can't really hear it but if you use bigger speakers it's still there somewhat. If you want to post a mp3 to a website, I'd be please to try WNS on it. Sneddy

Subject: RE: Ideas about removing wind noise from long file?
Reply by: D'Anne
Date: 9/17/2013 11:01:15 PM

Sure, I created a short clip from the original.

https://docs.google.com/file/d/0B8tt3mHgp7sNcUdFYTdsbnliMEU/edit?usp=sharing

And this is the file after removing the bottom 250 Hz. No other processing.

https://docs.google.com/file/d/0B8tt3mHgp7sNVWxOZDVnUHhMVUk/edit?usp=sharing

New Project, import layer.
Reset Y axis to show from 0 to 800 hertz or less.
Create new layer for extraction
Make a Frequency Selection from 0 to 250 Hertz, across the full time width.
Use Extract Area Tool.
Set freq width to 500 Hz.
Select within the region from the far left to the far right. (drag across)
Wait for computer to catch up.
Deselect the selection. (necessary!) ( Press S and select outside the area.)
Deselect the extraction layer and change from '+' to '-'.
Listen to result

Pretty much the standard noise removal process except that I removed all
content below 250 Hz. Yes I can still hear where the wind noise is, but the low frequency rumble is really gone.

Subject: RE: Ideas about removing wind noise from long file?
Reply by: UKharrie
Date: 9/20/2013 7:42:25 PM

Interesting point about "Loud-Speakers"
- OP needs to check what playback is to be used . . .if it's his home, that's much less of an issue, but for some venues it may be difficult to remove the system LF response (although it should be). . . . in which case an analogue filter might be worth considering, - that way any audio that is passed to the "system" will have nearly all the Bass removed.

For similar reasons I am attempting to build a Sub-Bass - I suspect this will be somewhat better than most Movie-Club venues.

My understanding of SL, is that you can draw a shape over the offending noise region and "Cut" - so to do this over a long clip might be easy to do if the timeline can be adjusted so it is all in view. However, whilst SL "might be magic" (my words) the effect of removing substantial bands of audio is bound to be noticed. - OP might need to replace it with something from a "Wild track" - taking special care over wind avoidance.
Surely an interesting Up-date option would be to remove "Signature patterns" - so users can define the signature ( of "Wind" in this instance ), then it can be told to remove anything like that from the whole file. . . . since "faults" are likely to be along the whole file.

What is surprising is that with Sony's Audio and Video heritage, they are not suppliers of wind-proof microphones . . . . there's a thought!!

Message last edited on 9/20/2013 7:44:39 PM by UKharrie.

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