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Reference.org
Angle modulation
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<p>Angle modulation is a class of carrier <a href="/facts/Modulation/aAXPjINv">modulation</a> that is used in <a href="/facts/Telecommunications/vxoj1cxR">telecommunications</a> transmission systems. The class comprises <a href="/facts/Frequency_modulation/qIExDdtv">frequency modulation</a> (FM) and <a href="/facts/Phase_modulation/ws1kz7Y9">phase modulation</a> (PM), and is based on altering the <a href="/facts/Frequency/QUSbPaW8">frequency</a> or the <a href="/facts/Phase_(waves)/cpGtuVll">phase</a>, respectively, of a <a href="/facts/Carrier_signal/ae98pBlY">carrier signal</a> to encode the message signal. This contrasts with varying the <a href="/facts/Amplitude/aEckuXJM">amplitude</a> of the carrier, practiced in <a href="/facts/Amplitude_modulation/3sTxsXk6">amplitude modulation</a> (AM) transmission, the earliest of the major modulation methods used widely in early radio broadcasting. </p>