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<p>many types of acoustic events, audio waveforms are typically sampled at 44.1&nbsp;kHz (<a href="page.php?w=Compact_Disc_Digital_Audio">CD</a>), 48&nbsp;kHz, 88.2&nbsp;kHz, or 96&nbsp;kHz. The approximately double-rate requirement is a consequence of the <a href="page.php?w=Nyquist_theorem">Nyquist theorem</a>. Sampling rates higher than about 50&nbsp;kHz to 60&nbsp;kHz cannot supply more usable information for human listeners. Early <a href="page.php?w=professional_audio">professional audio</a> equipment manufacturers chose sampling rates in</p><p>
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