292 Chapter 5
Concepts
Analog Modulation Concepts
Figure 5-5 AM for Various Depths
Figure 5-6 on page 292 illustrates an AM signal with an asymmetrical baseband
source. The first definition of modulation index still applies here. For it, m = 46%.
The second definition, however, does not apply since P − A is not equal to A − T.
The Measuring Receiver detects a different value for r if the positive peak of the
recovered signal is detected than if the negative peak is detected. Thus a different
modulation index is measured for PEAK+ than for PEAK−.
Figure 5-6 AM with an Asymmetrical Baseband Signal
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