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<p>a <a href="page.php?w=diffraction">diffraction</a>, <a href="page.php?w=Interference_%28wave_propagation%29">interference</a> or a <a href="page.php?w=Reflection_%28physics%29">reflection</a> or a mix of the three. If several <a href="page.php?w=Transmission_medium">media</a> are present, a <a href="page.php?w=refraction">refraction</a> can also occur. Transduction processes are also of special importance to acoustics.</p>

<p><big> Fundamental concepts </big></p>
<p><big> Wave propagation: pressure levels </big></p>
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