On a MacBook, I can be in a Zoom Meeting and speak into the MacBook Mic, while also listening to the meeting via the MacBook speakers. How is it possible for the mic to only receive my voice (and not also the sound of the meeting coming out of the speakers)?
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Going off the other replies, when 2 people on a call are watching the same livestream (and both are using speakers), the laptop will naturally cancel out the sound of the speakers. However, when there’s another source of audio being picked up on top of the speakers (such as someone talking),the frequencies of the speaker audio tend to slip through the cracks and you can hear little bits.
That’s why on virtual meetings you can hear someone’s laptop speakers only when they’re speaking
TL; DR
Laptop cancels out the audio, but it has trouble cancelling the sound of your speakers if there is another source of sound in the room, like you speaking.
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