Section 5.1 KEY CONCEPT Cells have distinct phases of growth, reproduction, and normal functions.
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5.1
Chapter 5
Analog Transmission
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5.2
5-1 DIGITAL-TO-ANALOG CONVERSION5-1 DIGITAL-TO-ANALOG CONVERSION
Digital-to-analogDigital-to-analog conversion is the process of conversion is the process of changing one of the characteristics of an analog changing one of the characteristics of an analog signal based on the information in digital data. signal based on the information in digital data.
Aspects of Digital-to-Analog ConversionAmplitude Shift KeyingFrequency Shift KeyingPhase Shift KeyingQuadrature Amplitude Modulation
Topics discussed in this section:Topics discussed in this section:
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5.3
Figure 5.1 Digital-to-analog conversion
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5.4
Figure 5.2 Types of digital-to-analog conversion
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5.8
Figure 5.3 Binary amplitude shift keying
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5.13
Figure 5.6 Binary frequency shift keying
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5.18
Figure 5.9 Binary phase shift keying
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5.27
5-2 ANALOG AND DIGITAL5-2 ANALOG AND DIGITAL
Analog-to-analog conversion is the representation of Analog-to-analog conversion is the representation of analog information by an analog signal. One may ask analog information by an analog signal. One may ask why we need to modulate an analog signal; it is why we need to modulate an analog signal; it is already analog. Modulation is needed if the medium is already analog. Modulation is needed if the medium is bandpass in nature or if only a bandpass channel is bandpass in nature or if only a bandpass channel is available to us. available to us.
Amplitude ModulationFrequency ModulationPhase Modulation
Topics discussed in this section:Topics discussed in this section:
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5.28
Figure 5.15 Types of analog-to-analog modulation
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5.29
Figure 5.16 Amplitude modulation
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5.31
Figure 5.17 AM band allocation
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5.33
Figure 5.18 Frequency modulation
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5.34
Figure 5.19 FM band allocation
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5.35
Figure 5.20 Phase modulation