Why the playing audio will be recorded into the mic?

[Sergei Steshenko]

"The output audio is not sent to the speakers, but from the headphones, 
and the mic cannot pick up the played audio from the air" - actually, it 
can. I recently tested a USB audio interface with connected to it XLR 
microphone, and I was wearing circumaural headphones. With high enough 
gain I managed to obtain oscillations because of the acoustic feedback.

--Sergei.

On 5/23/24 05:39, 赵成义 wrote:
> Hi guys,
>
> >>  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
>
> The output audio is not sent to the speakers, but from the headphones,
> and the mic cannot pick up the played audio from the air,
> so I don't think it's an echo issue.
>
> I am using a four-section headset, and the input and output are on the 
> same audio port.
> Is it possible that there is signal interference in the input and output?
>
> Thanks,
>
> Chengyi
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