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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]]s, effectively overcoming the [[diffraction limit]] (a kind of spatial 'uncertainty principle') associated with linear acoustics [http://asa.aip.org/books/nonlinear.html#Preface1]. Parametric arrays can be formed in water, air, and earth materials/rock [http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JASMAN000091000004002350000003&idtype=cvips&gifs=yes.]
Practical applications are numerous and include underwater sound ([[sonar]], depth sounding, sub-bottom profiling),medical [[ultrasound]] [http://adsabs.harvard.edu/abs/2001PMB....46.2967K], underground sesimic prospecting [http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JASMAN0000760000S1000S78000002&idtype=cvips&gifs=yes], active noise control [http://www.mecheng.adelaide.edu.au/anvc/abstract.php?abstract=378], and directional high-fidelity commercial audio systems ([[Sound from ultrasound]].
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