i’ve been struggling with this a bit also. I haven’t necessarily solved it but here are a few things I’ve tried:
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I’m assuming you are running PureOS. If so, make sure you have the latest update. The recent update that updated the kernel to 4.19.0 (or something) made a big difference in my display. It might help with other hardware.
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Then check your Sound settings on the gnome settings. I noticed the default setting was a low mic volume (under Input). When I increased the volume, so people could hear me on a video call, is when I noticed the static kick in. I realized I would have to find a happy balance between static and people being able to hear me.
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I noticed the mic was worse with skype than with MS Teams. So, some apps may have better noise canceling also.
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I mention noise canceling because I do wonder if the noise you are hearing is static or the mic is actually picking up background noise from the fan for instance. So, you might try doing some tests where the machine is in a cooler setting so the fan doesn’t kick in and see if that helps.
Basically, the mic does seem to be a problem on my 15v4 running pureOS. So, it might be the drivers with pureOS, etc.
I haven’t found a true solution yet.