am modulation - Chapter Three Amplitude Modulation...

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Chapter Three: Amplitude Modulation
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Introduction Amplitude Modulation is the simplest and earliest form of transmitters AM applications include broadcasting in medium- and high-frequency applications, CB radio, and aircraft communications
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Basic Amplitude Modulation The information signal varies the instantaneous amplitude of the carrier
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AM Characteristics AM is a nonlinear process Sum and difference frequencies are created that carry the information
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Full-Carrier AM: Time Domain Modulation Index - The ratio between the amplitudes between the amplitudes of the modulating signal and carrier, expressed by the equation: c m E E m =
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Overmodulation When the modulation index is greater than 1, overmodulation is present
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Modulation Index for Multiple Modulating Frequencies Two or more sine waves of different, uncorrelated frequencies modulating a single carrier is calculated by the equation: m = m 1 2 + m 2 2 + ••
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Measurement of Modulation Index
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am modulation - Chapter Three Amplitude Modulation...

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