# Amp_Mod-Amplitude modulation

May 1st, 2015
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Amplitude modulation (AM) occurs when the amplitude of a carrier wave is modulated, to correspond to a source signal. In AM, we have an equation that looks like this:We can also see that the phase of this wave is irrelevant, and does not change (so we don't even include it in the equation).

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Amp ModAmplitude modulation (AM) occurs when the amplitude of a carrier wave is modulated, to correspond to a source signal. In AM, we have an equation that looks like this:We can also see that the phase of this wave is irrelevant, and does not change (so we don't even include it in the equation). | AM Radio uses AM modulation|AM Double-Sideband (AM-DSB for short) can be broken into two different, distinct types: Carrier, and Suppressed Carrier varieties (AM-DSB-C and AM-DSB-SC, for short, respectively). This page will talk about both varieties, and will discuss the similarities and differences of each.CharacteristicsModulation IndexAmplitude modulation requires a high frequency constant carrier and a low frequency modulation signal. A sine wave carrier is of the form A sine wave modulation signal is of the form Notice that the amplitude of the high frequency carrier takes on the shape of the lower frequency modulation signal, forming what is called a modulation envelope.The modulation index is defined as the ratio of the modulation signal amplitude to the carrier amplitude. where The overall signal can be described by:More commonly, the carrier amplitude is normalized to one and the am equation is written as:In most literature this expression is simply written as:If the modulation index is zero () the signal is simply a constant amplitude carrier. If the modulation index is 1 (), the resultant waveform has maximum or 100% amplitude modulation.Sideban

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