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<p><b>Automatic gain control</b> (<b>AGC</b>), sometimes <b>Automatic volume control</b> (<b>AVC</b>)  is a closed-loop <a href="page.php?w=feedback">feedback</a> regulating circuit in an <a href="page.php?w=amplifier">amplifier</a> or chain of amplifiers, the purpose of which is to maintain a suitable signal amplitude at its output, despite variation of the signal amplitude at the input. The average or peak output signal level is used to dynamically adjust the <a href="page.php?w=gain_%28electronics%29">gain</a> of the amplifiers, enabling the</p><p>
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