I’d have to agree that the crew of the Enterprise looks up to talk into the combadge so we can see their smiling faces. Realism aside, what is the alternate camera angle? Riker, neck scrunched up, jowly flat overlapping one eye, lips mashed into an awkward position, cheekbone fused to his shoulder, mouths sweet nothings into a plastic brooch? Um, no. The cast looks much more dynamic, heroic, and active if they look up with firm jaw and steely gaze.
Well, first of all, the pickups on some speakerphones aren’t omnidirectonal. If you don’t point your face at the speakerphone, the person on the other end can’t hear you.
Secondly, “Angel One” was one of the earlier first-season episodes. The cast and tech crew did not yet know their subspace communicators from their black holes, yet, so to speak…
The sound wouldn’t have to come from above - if it’s clear enough that you don’t need to point your head at the communicator, then I wouldn’t be surprised if the natural direction to look is up, simply because looking at someone cues that you’re talking to someone, and up is where there isn’t anyone, so cues that you’re talking to yourself, or someone not visible, etc. Down would work, but it might just look like you’re shy…
I make it my hobby to explain away inconsistancies
This was actually an element in an early episode of the 1979-81 series Buck Rogers in the 25th Century. Buck (Gil Gerard) has gone “undercover” (heh-heh) aboard the Draconian spaceship, ostensibly to nail Princess Ardala (Pamela Hensely). He instead knocks her out with some kind of taser and goes on a search-and-destroy mission. Along the way, he gets advice from Doctor Huer (Tim O’Conner) through a miniaturized communicator, apparantly injected into Buck’s cheek near his ear, and resembling a small pimple.
You will have to forgive me if I feel somewhat conflicted about whether I should shake your hand in congratulations for knowing this obscure tidbit or mock you mercilessly instead.
Another fascinating bit of technology is the Universal Translator. It automatically translates everyone’s conversations into the listener’s native language, allowing a guy from Cleveland, Ohio to communicate with a Klingon, a Ferengi, and a Romulan without any of them needing to know a common language.
So, why do everyone’s lips move like they’re speaking English?
I’m thinking that a conversation betwen Picard and the ambassador from Trell’Zhan IV should look a badly dubbed Godzilla movie.