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Patent No. 3566347  Psycho-acoustic projector (Flanders, Feb 23, 1971)

Abstract

Broadly, this disclosure is directed to a system for producing aural psychological disturbances and partial deafness of the enemy during combat situations.  Essentially, a high directional beam is radiated from a plurality of distinct transducers and is modulated by a noise, code or speech beat signal.  The invention may utilize various forms and may include movable radiators mounted on a vehicle and oriented to converge at a desired point, independently positioned vehicles with a common frequency modulator, or means employed to modulate the acoustical beam with respect to a fixed frequency.  During combat, friendly forces would be equipped with a reference generator to provide aural demodulation of the projected signal, thereby yielding an intelligible beat signal while enemy personnel would be rendered partially deaf by the projected signal as well as being unable to perceive any intelligence transmitted in the form of a modulated beat signal.

 

Notes:

Satellite Surveillance