So, if I’m in a call with someone, with the speaker on, why does the mic not receive the sound the phone is emitting?
In: Technology
The phone (or computer that’s doing the video/audio conferencing) has software that knows what signals it just sent to the speaker, and uses those signals to cancel out the speaker’s sound that’s coming in through the microphone. The remaining signal picked up from the microphone is your voice, which the software can send to the other end of the call. This is the sophisticated approach to preventing the speaker’s sound from interfering with your voice.
As someone else already pointed out, a simpler approach is to mute the speaker when the phone detects sound is coming in through the microphone. This is a pretty good technique (not a great one), but it’s a lot cheaper to make than the signal analysis and cancelling that’s done in the sophisticated technique.
Latest Answers