Microphone noise

[bjornhallberg]

Hey

So I have a couple of cameras (Dahua 4431, real cheap stuff) in an extremely dusty workshop type environment. One of them has started sounding really flaky. Can hardly make out the captured audio. I am of course running without noise cancellation and the audio used to be better at some point. Audio settings in the camera don't seem to matter. The other cameras are fine.

Tried compressed air for cleaning but it didn't seem to have any effect. I have yet to disassemble the unit and check the microphone more closely. Any pointers?

Mp3 sample download:
https://file.io/X53KdM

 

[looney2ns]

Take it apart and check all connections. In the future, don't purchase china region hacked cams.

 

[tangent]

Try vacuuming it lightly.

 

[VorlonFrog]

The microphone is installed behind a pinhole in the face of the camera. Vacuuming from the outside might help clear any impacted debris. The microphone is usually glued inside, so removing it to fully clean the opening is a risky operation.