Noisy audio? Wireless mics...

jgaertner's picture
Last seen: 2 years 11 months ago
Joined: 05/26/2010 - 5:23pm

Hello, I just shot two scenes for my next instructional video using a newly purchased wireless mic. When I went to capture it on my computer, I noticed a lot of scratchy noise on the audio track that is not there on footage shot earlier with the exact same camera and set up? I was using photo lights but there were overhead florescent lights on in the studio. Could these be making the noise? I just shot some new video with no wireless mic and no florescent lights and dumped that to my computer and there was no noise. Are there any solutions to this problem? I now I need to check the sound before pressing forward!

Woody Sanford's picture
Last seen: 2 years 8 months ago
Joined: 10/19/2010 - 7:33am

Yes the overhead lights will causenoise. Also depending on what type of wireless you have can be worse in that environment. The FM type will be sctratchy with spikes and be hard to find a channel that is clear. An XLR connected mic will help and also a VHF/UHF type will be more clear under lights.

You might be able to clean/scrub the audio a bit in an audio software like Adobe Audition or Soundbooth but from my experience you will not get it clear enough without effecting the vioce and making it horrible. Best fix is to fix the mic issue and re-shoot. I hate to have to recommend a do-over but it is what it is.

deuce1286's picture
Last seen: 7 years 3 months ago
Joined: 04/29/2010 - 2:58am

To add to what WSanford said, your best bet if possible is to shoot over. Also as you mentioned, definetly get into the habit of checking your audio before you shoot. You'd be suprised what will give you feedback and what types of enviroments will cause problems.

One example, a shoot i was on at a new local hospital clinic was an audio nightmare. The clinic was a new recycled material/eco-building. All the recycled metal's in the building were causing a terrible static hum in every room it was in. Luckily the majority of our shooting was in another location in the building that was fine. But its just one example of why checking ahead can save many headaches! lol

CraftersOfLight's picture
Last seen: 2 years 2 weeks ago
Joined: 02/17/2009 - 5:42am
Plus Member

Just a thought...

Was the "scratchy" noise occuring only when your subject was moving? That could be something as simple as clothing fabric rubbing against the mic.Relocating the mic might solve the problem.

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XTR-91's picture
Last seen: 4 years 3 days ago
Joined: 12/06/2008 - 8:57pm

It may be the adapter: Y-connector

jgaertner's picture
Last seen: 2 years 11 months ago
Joined: 05/26/2010 - 5:23pm

Hello, I did end up re-shooting the 2 parts of the video with the over head lights off. It was a pain because I had to set up a lot more lights. Question is, I am using Compact Flourescents in my light stands? So why are they not creating any noise? Also, Anyone know of a full spectrum screw in light bulb in the 500W range I could use in my fill lights? I was using just regular spots from Lowes, because it was all I had yesterday when I had time to do the shoot again.

Thanks, Cismontguy

XTR-91's picture
Last seen: 4 years 3 days ago
Joined: 12/06/2008 - 8:57pm

Maybe there are just certain lights, designed a certain way where they can contain the electrical hiss, through some sort of capacitance

You can put capacitors on your lights to take it out

NDFilmer's picture
Last seen: 6 years 6 months ago
Joined: 01/14/2011 - 2:49pm

My experience has been that scratchy noises came from the microphone system, loose connection short in the cable, character movement. Electrical interference i.e. fluorescent lighting, usually induced a background hum on the audio.