I'm sitting here at the desk, and there's a faint, quick, "BeBeBeep!"
I am not familiar with this noise. It came from someplace close, as in "on the desk" close. It was very muted.
The eMac is off, and the batteries of the older iPod on the desk in front of me are flatter than Kansas and, besides, the iPod doesn't have any external speaker anyway. It didn't come from the speakers of VFTP Command Central, because it would have been louder, nor did it come from the cordless phone, because it is above my head level, perched atop VFTP Command Central's tower case.
That leaves my phone or my camera, both at my left elbow. It seemed too quiet for the phone, and I'm pretty sure that noise isn't in its repertoire, anyway; I've set all its verbal tics for when it gets updates or email or whatever. Maybe the camera needs charging... (Can anyone explain to my why an electronic device that is almost out of juice would waste its last precious electrons by making beeping noises?)
Note that this entire post would vary from complete science fiction to total gibberish as recently as ten or twenty years ago.