#### Phasor

It is common terminology to call the complex sinusoid's*phasor*, and its

*carrier wave*.

For a *real* sinusoid,

*phasor magnitude*is the

*amplitude*of the sinusoid. The

*phasor angle*is the

*phase*of the sinusoid.

When working with complex sinusoids, as in Eq.(4.11), the phasor
representation
of a sinusoid can be thought of as simply the
*complex amplitude* of the sinusoid. *I.e.*,
it is the complex constant that multiplies the carrier term
.

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Why Phasors are Important

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FM Spectra