That explains why the voice transmissions in Starwars are always so crap. The must be using Notch's CPUs coupled with crappy sound cards. Between simulating engine noises, turning noises, weapons and explosions, R2D2's beepy crap and whatever else, there's probably not enough bitrate and sound channels left to give a reasonably crisp voice transmission.
Oh, hang on. They explained that with saying it was encrypted. The only thing they seem to encrypt in the entire Starwars bloody universe are absolutely vital-to-understand fighter transmissions, and ensuring that everyone has really shitty video resolution (holocams or whatever) on even unimportant video transmissions. The can't lock doors, anyone can pilot a star-destroyer, no-one has you invented a decent set of security systems, but they encrypt publicly accessible broadcasts, military transmissions, and absolutely nothing else.
I really hope that Notch remembers that a fair bit of SciFi is the fiction part. There's some stuff that you really shouldn't go into or explain too much. You just say, "It's like that. It's in the future. That's what stuff is like in the future." You never try to actually explain stuff. Why would you? You're not going for a doctorate with your scientific explanations, you're writing fiction. Science fiction in fact. Or you may as well start waving your hands and telling them that THAT is the reason it's like that. Because you waved your hands.