The Acoustic Bazooka is a 2002 prototype that seems to have dropped out of sight. Whoever created the illustration shown below is an obvious devotee of 1950's sf.
More recently, a device nicknamed the "acoustic bazooka," more formally known as the directed stick radiator... was developed to serve as either a voice-hailing signal device ... The original research effort, however, consisted of equipment development and was not intended to evaluate ... effects on humans. No results of any such testing have been published, to date, in the scientific literature. It has been suggested that the device could "have the capacity to knock people off their feet."
Unfortunately, it appears that the possible dangers of US have been much overrated.
When discussing the practical limitations of technology, however, Altmann suggested that, because of basic physical principles, the development ... is unlikely..."
I think they are missing out on the real potential of super-duper sound energy, anyway. The real use for an Acoustic Bazooka is the removal of obstacles.
Consider the original Acoustic Bazooka - Vavoom from the Felix the Cat cartoon.
MAI-Voice-2 Microsoft Text-To-Speech
'I made disks of my own voice to the number of five hundred very carefully chosen words.' - Nat Schachner, 1937.
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Tactile Skin Supplier Map
'What strange sensitivity! What an amazing development of science was manifested in every move and act and word of this Robot!'
Orb Nomad Zero-Emission Electric Aircraft
'That explains how it was so easy for me to remain motionless in midair or to perch on a flagpole in imitation of a giant bird, even in the windy city of Chicago.'
DIY Robot Scorpion Crushes It
'...it raised its front end off the ground and waved its antennae at them, then raised one armoured claw as if to snip them out of the sky.'