Audio problem - help needed

iggy097

iggy097

Well-known member
I posted this in the C100 section, but maybe it will get more attention here -

Let me preface in stating what a jackass I am by not having my headphones on while recording for the second half of my shoot.
Camera is a Canon C100
So, after sitting down to work and listening to half of my footage from my shoot, I hear this lovely sound.
I have no idea wtf it is, but it's in the background of all of my recording. I'm trying to think of what could have happened, I shot outside, put the camera in the car, drove back to the studio, and everything from back in the studio from that point on as this in the background.
Yes, I am a complete jackass and didn't put my headphones back on when I got back in. Why? Well, as stated, I'm a jackass.
Denoiser has gotten rid of the noise, mostly, but I am left with some nice tinny watery dialogue in places. Just awesome.
Any ideas what could have caused this?
The microphone is a Rode NTG-2 and it is recording fine now, in fact, the last 2 segments are fine.
Not sure what it could have been, nothing is loose, and the camera was moved, turned off and on, and a battery changed throughout that.
I had it recording to both channels - and both channels are affected.
The only thing I can possibly think is that the AA battery in the Rode went bad? But I had it sent to phantom power.
Any ideas what this noise is?

View attachment Wtf.zip
 
I believe I managed to duplicate it this morning just now, I didn't hear the beeping but a slight hiss when wiggling the XLR input into the C100.
Perhaps the XLR input was loose or became jostled on the way back from the outdoor scene.
 
So the file you posted averages around -32 dB. I'm assuming this is the offending sound isolated from your original track? Best to post a straight-out-of-the-camera WAV, without and processing at all. But good on you for posting anything at all, most do not.
 
That is the audio on the track, not isolated. That part was while no one was talking, a quiet shot of the room.
 
Well I must be feeling saucy this morning because there are much more knowledgeable audio minds on this board. I chimed in because I have a NTG-2 as well and they really need a healthy amount of input gain as their output is low. Even worse with a battery, but you said you ran phantom to it. Perhaps the phantom power got switched off by accident?

Then there is that beeping. I was sitting here trying to discern what it was, feeling like Jodie Foster in Contact, pressing my headphones into my head. Nothing to add on that I'm afraid.

Craig
 
well the buzzing is electronic. It sounds like a preamp when the batteries are going out (consumer gear). The beeping seems to be at a one second interval so I'm guessing it's some clock. But could be a smart phone checking in, though that usually is less often and more like an old modem handshake sound. I would bet both are RF you are picking up from? because of a dodgy connection.

If you had a bad or dirty connection in your mic chain then it can at times act like an antenna and pick up all kinds of junk. I had a mic that was very RF sensitive for some reason. Normally it was fine, BUT at the edge of the bay when the Navy was in it could "hear" the raydar. I would get this whoosh, whoosh sound and it was synchronized with the rotating radar array on one of the ships. That mic also picked up the underground antenna array the Navy uses to talk to Subs. You could follow the route with the mic sounding like a geiger counter.

If your connectors are not all shiny and clean then they probably have oxides on them. The oxides can act as crystal radio receivers. If you have an intermittent connection (maybe a broken wire that only touches when the cable is bent just so) that also can act as an antenna.

I would swap out the cable with a new one and see if that helps. Also you might want to get some Caig Labs "deoxit" contact cleaner and give your connections some TLC.
 
The Rode was actually mounted on the camera, shotgun style. I "think" it was caused by the connection being jarred a little off where the XLR inputs are on the camera. When I had it in the car it rolled onto it's side, I bet that where the problem is.
 
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