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FORUMS Post Processing, Marketing & Presenting Photos Video and Sound Editing 
Thread started 12 Feb 2018 (Monday) 13:53
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What is causing this noise?

 
Scottboarding
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Feb 12, 2018 13:53 |  #1

I filmed some skateboarding with my friends the other night, and I noticed this feedback that was in every clip. I'm using a Rode Videomic Go, and this was never a problem on my Canon 7D. Any idea what would be causing this? The mic was fully plugged in, and I kept checking it throughout the night to make sure, but the noise was present the whole time.





Thanks!


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BigAl007
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Feb 14, 2018 10:32 |  #2

I don't really hear any audio feedback as such. I just sounds like the gain is really high, so that every little click of the wheels is very audible. It also seems to be picking up a fair bit of high frequency too, so that it sounds as if you have a bit too much "treble" in the audio. At least the sound isn't really noisy, and the clicks, much like specular highlights won't really be too adversely affected by pulling the levels down in post.

Actually I have read in some articles that you want to record the sound levels at the point where the loudest sound is just reaching the clipping point. Just like shooting Expose To The Right for photography, and for the same reason, to maximise the DR. AS with ETTR you then have to pull the levels down to match the correct level of ambient sound that you want to hear on the final cut.

If your camera has manual gain controls, and you want to have ready to use video, without the requirement to post process, then I would suggest turning the levels down in camera. I generally expect to have to do some post processing, so I would try to record high, and pull the levels in post, but then I always shoot RAW and use ETTR too.

Alan


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MalVeauX
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Feb 14, 2018 10:38 |  #3

I hear the feedback plainly when I listen to it with near field speakers, and it's very obvious in headphones.

Sounds like electrical feedback to me, not something physical. To reduce this stuff, you increase gain on the microphone so that it records it at a higher level and the peaks of the sound you want to keep will be higher dB, then in post, you lower the sound level and the noise floor drops to nothing, but you end up keeping the amplified peaks. This is why the microphones have a +10db or similar switch on them, for this very purpose, to remove backround/noisefloors, but you do it in post. By the way, every +5db doubles audible apparent volume, so +10 and +15 db on these microphones is 2 and 4 times louder. This is why you record it so loud, so you can then, in post, lower the sound level and the noise floor goes with it.

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Spacemunkie
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Post edited 4 months ago by Spacemunkie. (2 edits in all)
     
Feb 14, 2018 20:50 |  #4

Mobile phone? They play havoc with radio mics.

Turn it off or stick it in flight mode and I suspect your problem will disappear...


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Scottboarding
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Feb 15, 2018 11:28 |  #5

Spacemunkie wrote in post #18564045 (external link)
Mobile phone? They play havoc with radio mics.

Turn it off or stick it in flight mode and I suspect your problem will disappear...

Nope, it's an Olympus E-M1. I don't have a zoom lens so I couldn't do anything to fancy with the filming.

Alan and MalVeauX got it for me, thank you! I pulled the audio down in post and the noise went away, but I could still hear the skateboarder.

Thanks everyone!


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Spacemunkie
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Feb 18, 2018 07:04 |  #6

I was talking about mobile network interference - not suggesting that the camera you were using was a mobile phone :rolleyes:

Pulling levels is fine (where you have headroom for it), but it doesn't address the cause of the interference. Try turning off your phone (and the wi-fi in the camera) next time you're filming!


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Scottboarding
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Feb 19, 2018 17:23 |  #7

Spacemunkie wrote in post #18566582 (external link)
I was talking about mobile network interference - not suggesting that the camera you were using was a mobile phone :rolleyes:

Pulling levels is fine (where you have headroom for it), but it doesn't address the cause of the interference. Try turning off your phone (and the wi-fi in the camera) next time you're filming!

Oh I see! Sorry for the misunderstanding; I have very little knowledge when it comes to audio so that went right over my head. I'll give it a shot, thanks!


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Spacemunkie
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Feb 21, 2018 19:16 |  #8

Just coming back to this...

I was recording yesterday and experienced exactly the same sound. Was definitely EMI and did seem to be related to my phone. I switched it off but still got the interference when I touched the phone in my pocket. I ended up having to put the damn thing in another room! iPhone SE for what it's worth.

Wondering whether it's worth putting clip on ferrite filters on all my cables now...


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Nogo
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Feb 21, 2018 20:12 |  #9

When you switched it "off" what do you mean? Technically if the phone is able to receive text or calls it is sporadically transmitting. A phone is not truly off unless it is shut down.

As mentioned above airplane mode may be fine to stop the RFI. I am just mentioning this to say if you only turned the phone off as in the screen went blank, for this purpose the phone is not off at all.


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Spacemunkie
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Feb 25, 2018 18:32 |  #10

Off...


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Choderboy
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Feb 26, 2018 01:08 |  #11

Why not ask Rode?
http://www.rode.com/co​ntact (external link)

Tech support is available in your region!
The quickest way to get assistance with repairs and spare parts is to contact your local RØDE support & service agent. We have authorised support & service agents all over the world! Use the drop down menu below to find one near you.


http://www.rode.com …en-recording-on-my-camera (external link)

Why do I get a low level noise sound when recording on my camera?
This is usually caused by the function of "Automatic Gain Control" or "AGC" on the camera.
Basically, when the camera cannot sense an audio input signal it automatically increases the gain of the input. It is increased so much that the noise floor in the camera microphone amplifier becomes audible .
The AGC can be disabled on some cameras and it is worth checking with you camera manufacturer for information on this, which can sometimes require a firmware update to the camera.
RØDE have created the VideoMic Pro to help combat this issue, the VideoMic Pro contains a 20dB pre amplifier, boosting the mic signal so that the camera will see a good signal level and not engage its AGC.
We recommend setting your audio levels manually to achieve an optimum signal to noise ratio and disabling the AGC of the camera.


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MBR
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Mar 25, 2018 07:44 |  #12

Scottboarding wrote in post #18562182 (external link)
I filmed some skateboarding with my friends the other night, and I noticed this feedback that was in every clip. I'm using a Rode Videomic Go, and this was never a problem on my Canon 7D. Any idea what would be causing this? The mic was fully plugged in, and I kept checking it throughout the night to make sure, but the noise was present the whole time.





Thanks!

Transmitter in your cell phone, since you cannot truly shut that type of phone off get as much distance between it and your microphone, or stow it in the trunk of your car.




  
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What is causing this noise?
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