audacity forum • view topic - create harmonics or something isolate transmission whine

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Create harmonics or something isolate transmissionwhine

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city Forum View topic - Create harmonics or something isolate tr... http://forum.audacityteam.org/viewtopic.php?f=28&t=66832

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Create harmonics or something isolate transmission whine

Posted by van2006ko Wed Jul 18, 2012 4:14 am

I am trying to figure out how to isolate sounds from a audio file from an vehicle (Abus). The sounds which I am trying to isolate are transmission gear whine sounds. So

far depending on the whine, I am having some luck with the equalizer, however, not thebest of luck. I want something that is extremely clean sounding, would it somehow bepossible to generate a harmonic or tone so that it would sound exactly like atransmission gear whine?

van2006ko Posts: 2Joined: Wed Jul 18, 2012 4:06 am

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Re: Create harmonics or something isolate transmission whine

Posted by kozikowski Wed Jul 18, 2012 4:34 am

I thought I had you right up 'till the last sentence. Why would you want to generatetransmission whine?

Anyway, the answer to both questions is no. You can't get rid of a moving target. If youhad one and only one noise or interference -- we use air conditioner whine as anexample -- then you can train the software to search and destroy that character orsound. Unless it moves. Then the software needs to be trained all over again.

If you have a pure interference that sounds like a flute or bell tone, then you have a

fighting chance of sucking it out of your show with the equalizer tool. Along with thatsucking will go all the parts of the show with the same pitch tone, like a singing voice.

But that's not what you have. You have "whine" which by definition has many multipleharmonics and distortion products similar to bad power supply buzz in your musicsystem. You can't get rid of that, either, although you have a better chance with thatbecause it's always the same pitch.


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You will never get to a clean, perfect show. There are too many conditions against you.You violated #4. It's not just the TV. Any moving sound counts.Koz

-- The Four Horsemen of Audio Recording (time tested ways to kill your show)

-- 1. Echoes and room reverberation (Don't shoot the show in your mom's kitchen.)-- 2. Overload and Clipping (Any sound that's too loud is permanently trashed.)-- 3. Compression Damage (Never do production in MP3.)-- 4. Background Sound (Don't leave the TV on in the background.)

kozikowskiForum Staff Posts: 21362Joined: Thu Aug 02, 2007 5:57 pmLocation: Los Angeles

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Posted by kozikowski Wed Jul 18, 2012 4:39 am

Try Effect > Noise Removal. You select part of the show with transmission whine andno voice at all and make that the Profile. Then select a portion of the show with voiceplus transmission and apply the filter. It will try to remove the whine from the show --as long as the bus doesn't change speed at all.

Koz


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Posted by PGA Wed Jul 18, 2012 6:50 am

You could try analyzing the sound with Analyze > Plot Spectrum. If you stretch thePlot window out horizontally, you might then see if there are any "aberrant" spikes in

the plot. You could then try using the Effect > Notch Filter to remove these particularfrequency spikes. This technique (originally explained to me by steve) workedperfectly to eliminate the whine of a heavy duty electric water pump in somerecordings I had made at our local water mill.See here for the original post of mine: viewtopic.php?f=46&t=65965

PGA Posts: 687Joined: Thu Jan 19, 2012 9:16 pm

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Posted by kozikowski Wed Jul 18, 2012 2:51 pm

I want something that is extremely clean sounding

That's the part I bet you don't get, but post back if you do and tell us how you did it.Spectrum tends to fall into the mud if you have noise other than the transmission whinelike rushing air or other traffic noise. Your ears a very good at picking out patterns innoise -- that's how we recognize cellphone voices, but seeing the whole packagearranged on a neat graphic is a whole different situation.

This is one piano note.

http://kozco.com/tech/audacity/piano_G1.jpg

Quick. What do you suppress to get rid of it?

I went back to read the post again. You're not trying to rescue a valuable interview on a


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tourbus are you? You want to create a special effect for a cellphone ring tone.Sometimes it's good to back away from the question and give us the 10,000ft (3048M)view of what you're doing. If your desired sound isn't included in the Generate listingor can't be gotten by modifying one of those, then you're still out of luck. One of theproduction offices on 4West has an award-winning collection of sound effects andtraffic/automotive is in the pile. They're money-based but they're very well done.

Koz


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Posted by van2006ko Wed Jul 18, 2012 11:58 pm

Well actually I have managed to clean up the sound a bit. Now just to give an overallview as to what I am doing. I am trying to recapture engine, transmission and drivetainsounds for a simulator called OMSI Bus Simulator. So far, I have some luck, evenwhen the bus or vehicle is accelerating, I managed to use the time-shift tool slow theentire recording down.

I'm basically aim trying to isolate the whine from the remaining sections of therecording. As far as upshift, downshift sounds, but those sounds are easier.

Here's an example of one recording - http://www.youtube.com/watch?v=NvrCoA3j ...r_embedded

van2006ko Posts: 2Joined: Wed Jul 18, 2012 4:06 am

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Posted by Trebor Thu Jul 19, 2012 2:41 am

This "turntable warp" plugin progressively speeds up or slows down a sound, a bit like

an engine accelerating or decelerating...http://wiki.audacityteam.org/wiki/Nyquist_Effect_Plug-ins#Turntable_Warping_MS

idling-bus, before-after turntable warp.mp3(783.67 KiB) Downloaded 50 times

Not entirely convincing as it changes the pitch and the speed.

Trebor Posts: 1846Joined: Sat Dec 27, 2008 5:22 pm

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