How do they ensure that during a remote TV interview you can’t hear the interviewer speak through the speakers of the interviewed one?

Question

Even when they talk over each other, we still only hear the interviewer and the guest talk. We don’t hear the speakers. (As argument against noise cancelling)

I know they could wear something like airpods, but I didn’t see anything in their ears so how is it possible without?

For example look up the Piers Morgan interview with Kanye West, thats an example of what I’m curious about.

In: Technology

Answer 1

Kanye is wearing an earpiece in his right ear. You can see the wire coming up and out.

Piers probably has one too but I didn’t watch enough of this interview to figure it out. But he does have a lapel mic, so that alone could be used along with another mic for an audio system to work out Piers’ voice apart from everything else. He’s probably just got a nicer, smaller, sleeker earpiece, though.