The lore has it iirc that suits are equipped (like ships) with some kind of devices that gathers information and produces an audio que. Audio masking is a counter measure to the suit picking up shooting.
It only works outdoors. For indoor work, you want noise suppression, but do you need it for non atmospheric planets? After all, no atmosphere means no sound, right? Cheers.
Of no consequence, but I had thought of it like it masked interference caused when shooting; but I like that other idea how it jams the safety signal. Yeah