How can people on the phone not hear themselves when on speaker?

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For example, my car speakers are very loud and i can hear people very clearly, how does none of this sound get transmitted back to them?

In: Technology

Speaking as someone who answers phones for a living, I do hear it. It’s awful when people call me on speakerphone/from their car.

Modern phones use multiple microphones to try to only transmit the caller’s voice (and not yours). I have no idea of the specifics.