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?
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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.
There’s some techniques for preventing this. Here’s a few:
* The application uses noise cancellation, essentially trying to detect the sounds it’s making and ignoring them. This is not always perfect.
* Reducing transmit sensitivity when playing audio, so when you’re hearing sound the threshold for “send” is higher.
* Using a microphone with good off-axis rejection- meaning the pickup pattern of the microphone makes it only able to effectively pick up sound from specific locations around it- most mics with this can pick up excellently from in front but are essentially deaf to sounds to the side or behind.
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