Why the playing audio will be recorded into the mic?

[Михаил Новоселов]

22.05.2024 15:14, 赵成义 пишет:
> Hi guys,
>
> >>When the Ubuntu system plays audio, the volume is set to above 90%, 
> >>and there is no external playback. The audio will not be collected 
> >>by the mic, but the played audio will be recorded into the mic. Why? 
> >>I can confirm that loopback is set to false state.
>
> >Hello, maybe have a look at https://gitlab.com/mikhailnov/pulsejoin 
> I mean I don't need to record played audio, but it is recored into the mic.
> I can confirm that ALSA loopback is set to false state, and the sink monitor
> is not used.
You probably need echo cancellation
>
> I think this issue exists in all linux systems that use ALSA. 
> Has anyone found this problem before?
>
> Thanks,
>
> Chengyi
>
>