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<p><a href="page.php?w=Process_control">Process control</a> a variety of signals are used, including the industry standard <a href="page.php?w=4-20%26nbsp%3BmA_current_loop">4-20&nbsp;mA current loop</a><br/>
* <a href="page.php?w=Seismology">Seismology</a><br/>
* <a href="page.php?w=Feature_extraction">Feature extraction</a>, such as <a href="page.php?w=image_understanding">image understanding</a>, <a href="page.php?w=semantic_audio">semantic audio</a> and <a href="page.php?w=speech_recognition">speech recognition</a>.<br/>
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