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Figure 18: Amplitude and phase modulation in the ‘phasor’ picture. The upper plots a) illustrate
how a phasor diagram can be used to describe phase modulation, while the lower plots b) do the
same for amplitude modulation. In both cases the left hand plot shows the carrier in blue and the
modulation sidebands in green as snapshots at certain time intervals. One can see clearly that the
upper sideband ( |