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<p>of the sine wave, while a low density of 1s occurs at the troughs of the sine wave.</p>

<p><big>Analog-to-digital conversion</big></p>
<p>A PDM bitstream is <a href="page.php?w=Code">encode</a>d from an analog signal through the process of a 1-bit <a href="page.php?w=delta-sigma_modulation">delta-sigma modulation</a>. This process uses a one-bit <a href="page.php?w=quantizer">quantizer</a> that produces either a 1 or 0 depending on the amplitude of the analog signal. A 1 or 0 corresponds to a signal that is all the way up or all the way down, respectively.</p><p>
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