I've had issues on PopOs 20.04 and 20.10 with microphones connected through the audio jack. Connecting through a cheap jack-to-USB converter eliminated the background noise. There were proposed fixes although none of them worked.
Jack-to-USB converters are apparently not recommended[1] due to wildly varying quality though.
On PopOs 20.10 I'm currently getting good audio from a ModMic USB. This[2] review is what made me buy the ModMic USB, although I know next to nothing about audio and audio quality.
The Audio Technica ATGM2[3] was also considered, but the mounting options for the ModMic USB as well as lower cost in my area won me over.
For me a headset mounted mic was a requirement due to space considerations and slightly lower cost, although next time I'm probably buying a very high quality free standing microphone.
On PopOs 20.10 I'm currently getting good audio from a ModMic USB. This[2] review is what made me buy the ModMic USB, although I know next to nothing about audio and audio quality.
The Audio Technica ATGM2[3] was also considered, but the mounting options for the ModMic USB as well as lower cost in my area won me over.
For me a headset mounted mic was a requirement due to space considerations and slightly lower cost, although next time I'm probably buying a very high quality free standing microphone.
[1]: https://www.youtube.com/watch?v=J1v1jtHz4C0 [2]: https://www.youtube.com/watch?v=Qquo2GpSQo4 [3]: https://www.youtube.com/watch?v=wIeJMdv5jxs