So how does this work? Is it the same as the kind of phase cancellation that you often see with two speakers playing the same tone, but just with lots of elements (and an ultrasonic source)?
It's a sound laser, or maybe I'm remembering the video in this link wrong on the terminology and the SASER is different? Maybe it's just "sound from ultrasound"
Its quite interesting. The directional ultrasonic array broadcasts a carrier frequency, not unlike am radio. You can read about the function of this sort of device at hackaday.
