Why can’t the receiving end of calls hear themselves if they’re on speaker?

Question

I have no clue as to how this works on phones and computers. If noise making noise, why noise not go through to other side?

In: 0

Answer 1

it would be hugely inconvenient, so every phone has a system to avoid it. The phone detects sound waves from the microphone, and cancels them from the speaker.

It still happens sometimes, but that is when somebody else on the call has echo, so their phone send your sound back to you, because lag in digital voice systems is too long for automatic cancellation.