In the modulation process, the baseband voice, video, or digital signal modifies
another, higher-frequency signal called the carrier, which is usually a sine wave.
A sine wave carrier can be modified by the intelligence signal through amplitude
modulation, frequency modulation, or phase modulation. The focus of this
chapter is amplitude modulation (AM).
Objectives
After completing this chapter, you will be able to:
■ Calculate the modulation index and percentage of modulation of an AM
signal, given the amplitudes of the carrier and modulating signals.
■ Define overmodulation and explain how to alleviate its effects.
■ Explain how the power in an AM signal is distributed between the carrier
and the sideband, and then compute the carrier and sideband powers,
given the percentage of modulation.
■ Compute sideband frequencies, given carrier and modulating signal
frequencies.
■ Compare time-domain, frequency-domain, and phasor representations of
an AM signal.
■ Explain what is meant by the terms DSB and SSB and state the main
advantages of an SSB signal over a conventional AM signal.
■ Calculate peak envelope power (PEP), given signal voltages and load
impedances….
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