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The ''parametric array'' is a nonlinear transduction mechanism that generates narrow, nearly sidelobe free beams of low frequency sound, through the mixing and interaction of high frequency sound wave waves, effectively overcoming the diffraction limit (a kind of spatial 'uncertainty principle') associated with linear acoustics [http://asa.aip.org/books/nonlinear.html#Preface1].
Practical applications are numerous and include underwater sound (sonar, depth sounding, sub-bottom profiling),medical ultrasound, underground sesimic prospecting, and directional high-fidelity commercial audio systems.
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