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<p><b>Quadrature amplitude modulation</b> (<b>QAM</b>) is the name of a family of <a href="page.php?w=signal_modulation">signal modulation</a> methods widely used in modern <a href="page.php?w=telecommunications">telecommunications</a> to transmit information. At its core, it conveys two independent analog signals by changing (modulating) the <a href="page.php?w=amplitude">amplitude</a>s of two differently phased versions of a single <a href="page.php?w=carrier_wave">carrier wave</a> using <a href="page.php?w=amplitude_modulation">amplitude modulation</a>.</p><p>
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