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Tourist
Posts: 4

How do I avoid over driving external microphone with the audio adapter?

I purchased a GoPro 7 Black back in the spring from GoPro and I just recently purchased the audio adapter, also directly from GoPro, and added an Edutige ETM-001 mic.  I have the camera mounted on my motorcycle helmet chin guard with an 18" extension cord into the helmet with the mic snug between my cheek and the cheek pad of the helmet with a dead cat mic cover on it near the corner of my mouth.  The quality is fine as long as I speak at a normal volume, or ride at a slow speed with limited ambient noise.  If I speak loudly, or as soon as my speed increases, I get the same crackling, popping, and distortion others have complained about.  I took the camera in my truck today and the audio was fine until I lowered the windows some to increase the ambient noise.  No wind was hitting the mic, just the noise in the cab caused the same issue with the audio quality.  The mic is definitly being over-driven by the noise level.  Is there a way to attenuate the input audio level?  It definitely appears to be a problem with the camera or the mic's inability to handle the ambient noise level from the surrounding wind noise or when I speak loudly.  I can post some examples if that would be helpful.

Tourist
Posts: 4

Re: How do I avoid over driving external microphone with the audio adapter?

I read that some recommended a camera reset.  I did that before the test in my truck today, but it did not correct the issue.

 

Here is a link to a few highlights from the recording I made yesterday.  Notice that when I raise my voice the audio distorts, and then when my speed increases the crackling and popping begins as the the audio is over-driven. When my speed decreases, the audio clears up as the ambient noise level declines.

 

https://youtu.be/1SPLPAvF7Ow

Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube.
Nomad
Posts: 1,104

Re: How do I avoid over driving external microphone with the audio adapter?

You're using an omni directional condensor microphone that's designed for Vlogging, picking up audio during meetings, face to face conversations.  It's not designed for close up (by the mouth) microphone work or for motor video's.  The microphone has a sensativity of -23DB so it's not surprising that you're overdriving it.

 

If you're trying to make a professional looking (and sounding) motor video, you have to realize that you're going to need a multi-microphone setup.  One for recording your voice, one for recording motor sounds.  

 

In this case, there may be an even simpler workaround.  Buy a cheap digital audio recorder.  Run your microphone through the audio input on the recorder.  Most recorders have a peak indicator and a gain adjustment.  You can then run the audio output into your GoPro.  This way you can use the automatic gain control on the audio recorder or use a manual adjustment to stop the overdriving.  

 

However in this case, you really are using the wrong microphone for the job and that's what's causing all of this audio distortion.

Tourist
Posts: 4

Re: How do I avoid over driving external microphone with the audio adapter?

[ Edited ]

Thank you so much for the reply and information @irishmanpdx.  I've read that some GoPro 7 Black users are having good success with the Purple Panda Lavalier mic inside a motorcycle helmet.  Are you familiar with that mic and whether are not I can expect better results with it?  I certainly will look into your suggestion, but would rather keep it a bit more simple and streamlined.  That's why I tried the Edutige ETM-001 mic, because so many of the lav mics have such long cords.  With the ETM I was able to use an 18" TRS extension cord from the mic through my cheekpad, out the bottom of my helmet and then easily into the GoPro audio adapter input mounted on the front of my chin guard.

 

A quick search for digital audio recorders that accept an external mic input revealed these 2.  They both have a headphone output that I am assuming is what I would connect to the GoPro.  Any opinion or guidance?

https://www.amazon.com/dp/B07L8CLVY7/ref=cm_sw_em_r_mt_dp_U_SygxDbK55QB0Y

https://www.amazon.com/dp/B01LLO251A/ref=cm_sw_em_r_mt_dp_U_zLgxDb59EJ6XK

 

Thanks