When two people are on a call, how does one mobile phone block the system/app sounds from the phone (but not the caller’s voice)?

Question

When two people are on a call, how does one mobile phone block the system/app sounds from the phone (but not the caller’s voice)?

In: Technology

Answer 1

Most phones nowadays have multiple mics

Let’s say.
mic 1 picks up your voice + background noise.

Mic 2 picks up background noise only

Your phone now knows to do mic 1 noise minus mic 2 noise = clearer voice