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<p>such as <a href="page.php?w=modem">modem</a>s, <a href="page.php?w=X10_%28industry_standard%29">X10</a> <a href="page.php?w=home_automation">home automation</a> <a href="page.php?w=control_system">control system</a>s, and <a href="page.php?w=Digital_Command_Control">Digital Command Control</a> type systems for <a href="page.php?w=Lionel_Corporation">Lionel</a> and other AC <a href="page.php?w=model_train">model train</a>s.</p>

<p>Counting zero-crossings is also a method used in <a href="page.php?w=speech_processing">speech processing</a> to</p><p>
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