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Hum on Audio from boom mic

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Samantha Hatton
Hum on Audio from boom mic
on Oct 24, 2011 at 12:37:04 pm

Hi All,

I am having real trouble with some Audio and wondered if anyone could help!

We Filmed a one person monologue using a boom mic, once the footage was digitized in we found that the audio had a hum all over it.

Is there any solution to this problem. I am using FCP and have sound track pro. I have tried using the noise reduction in sound track pro but it did not work.

All advice on this would be great Thanks

Sam

http://www.vimeo.com/claremakesfilms


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Jerry Hofmann
Re: Hum on Audio from boom mic
on Oct 24, 2011 at 5:34:21 pm

Try the Hum remover or the DC Notch filter in FCP with the audio...

Jerry

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Samantha Hatton
Re: Hum on Audio from boom mic
on Oct 24, 2011 at 6:44:07 pm

Hi Jerry

I will try that Thanks

Sam

http://www.vimeo.com/claremakesfilms


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Michael Gissing
Re: Hum on Audio from boom mic
on Oct 25, 2011 at 1:38:04 am

A parametric EQ with narrow notch EQ can be used to identify the hum. Set a narrow Q value (higher number) and add gain. Sweep the frequency to find the hum and then reduce the gain. You should be able to pull a lot of EQ level out of a low frquency like 50 or 60hz without adversely affecting voice. You can alo put a High pss filter on and shelve off below 80 hz to remove rumble or handling noise if that is also an issue.

Usually hum is based on line frequency so in 110 volt countries it is usually 60 hz. In 240 volt countries it is usually 50kz so start with those frequencies.

If the mic was mounted on the camera then try 150 hz which is a common hum from HDV transports.


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Andrew Rendell
Re: Hum on Audio from boom mic
on Oct 25, 2011 at 3:14:56 pm

+1 to what Michael says, but in addition if it's mains related you can get harmonics, so an additional very narrow notch at 100Hz or 120Hz as well as one at 50Hz or 60Hz (depending on where you are)can be helpful (and a couple of very narrow notches will have much less effect on your programme sound than one wider-Q one).

Also check the cabling from your boom mic before you use it again - balanced cable should not hum, that's precisely what it's designed to avoid. You might have lost continuity on one of the wires (although you'd have a bigger problem than just hum if you'd lost one of the signal +/- wires), or it might have shorted (become unbalanced) somewhere.


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