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<p>(specifically, not having high frequencies) or passed through a <a href="page.php?w=low-pass_filter">low-pass filter</a>; this is the <a href="page.php?w=frequency_domain">frequency domain</a> description. In terms of the <a href="page.php?w=time_domain">time domain</a>, the cause of this type of ringing is the ripples in the <a href="page.php?w=sinc_function">sinc function</a>, which is the <a href="page.php?w=impulse_response">impulse response</a> (time domain representation) of a perfect low-pass filter. Mathematically, this is called the</p><p>
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