how do microphones in a phone not pick up any audio that the speakers put out? if I put a call on speaker mode, how do people on the other end not hear themselves?
In: Technology
They use software which cancels the speaker noise from the microphone. Many also use input from a rear microphone to cancel ambient noise as well.
Sometimes it doesn’t work perfectly, and due to the half-second or so of lag in digital telephony, you can sometimes hear yourself speaking a half-second later from the other end.
On the whole it works pretty well, though. People have been improving it for about twenty years.
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