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Humming Noise

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Cody Walters
Humming Noise
on Mar 29, 2013 at 4:05:18 pm

Hello,

I wanted to ask this question out of curiosity. I am a wedding videographer and for receptions I get a master feed from the DJ or band to capture toasts, music during dancing, ect, usually direction from the mix off of the record out or tape audio. Unfortunately about 40% of the time I get good audio because of the feed being too hot or an unclean feed in general. An example I run into often is the constant humming in the audio. You can hear this through the speakers when nothing is being played. It is that sound you hear when you have a loose cable and you touch the tip of it with your finger.

What is the cause of this type of noise? Anything I can suggest to these guys to improve their audio source?

Cody Walters
Houston Video Production
Houston Wedding Videographer

Final Cut Studio 3
Adobe CS6 Master Suite
Panasonic HVX-200
Canon 7D, 60D



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Peter Groom
Re: Humming Noise
on Mar 29, 2013 at 9:16:12 pm

It'll be mains hum caused by you unbalancing a balanced feed, or it being unbalanced in the 1st place.
Rule 1 in tv - never trust anyone else for anything.
They know even less, probably.
Sound s way trickier than pictures.
What type of feed do you get. Xlr or jack and is it balanced jacks?

Why not put your own mics on speech makers as I would do. 4 speeches 4 mics
Peter

Post Production Dubbing Mixer


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Ty Ford
Re: Humming Noise
on Mar 29, 2013 at 10:14:18 pm

Hello Cody and welcome to the Cow Audio Forum.

There are many possible origins for hum.

If your gear and the sound board are both running on AC and plugged into different outlets, that can result in hum. Even if you are on batteries and the house is on AC, you can still get hum. Google "ground loop" and read up on that.

Bad connections can cause hum.

Lighting systems can cause hum.

If you can hear the hum in the PA, and the board is feeding the PA, you're probably going to get hum from the board.

The levels will be all over the place depending on which console output you use.

Dealing with a house sound feed is always a challenge.

Regards,

Ty Ford
Cow Audio Forum Leader

Want better production audio?: Ty Ford's Audio Bootcamp Field Guide
Ty Ford Blog: Ty Ford's Blog


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