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<p>of frequency (for <a href="page.php?w=root-power">root-power</a> quantities), the same positive slope as a 1 order <a href="page.php?w=high-pass_filter">high-pass filter</a>'s <a href="page.php?w=stopband">stopband</a>, although a differentiator does not have a <a href="page.php?w=cutoff_frequency">cutoff frequency</a> or a flat <a href="page.php?w=passband">passband</a>. A n-order high-pass filter approximately applies the n time derivative of <a href="page.php?w=signals">signals</a> whose frequency band is significantly lower than the filter's</p><p>
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