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Questions and Answers
What is the primary reason for modulating an analog signal?
What is the primary reason for modulating an analog signal?
How is the bandwidth required for Amplitude Modulation (AM) calculated?
How is the bandwidth required for Amplitude Modulation (AM) calculated?
What does Frequency Modulation (FM) primarily change in the carrier signal?
What does Frequency Modulation (FM) primarily change in the carrier signal?
What is the typical bandwidth requirement for Frequency Modulation (FM)?
What is the typical bandwidth requirement for Frequency Modulation (FM)?
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Which of the following statements about Phase Modulation (PM) is true?
Which of the following statements about Phase Modulation (PM) is true?
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Study Notes
Analog-to-Analog Conversion
- Represents analog information using an analog signal.
- Modulation is necessary if the transmission medium is bandpass or only a bandpass channel is available.
- Includes Amplitude Modulation (AM), Frequency Modulation (FM), and Phase Modulation (PM).
Amplitude Modulation (AM)
- Modulates only the amplitude of the carrier signal.
- The modulating signal forms the carrier's envelope.
- Requires a bandwidth of 2B, where B is the modulating signal's bandwidth.
- Due to spectral symmetry around the carrier frequency (fc), half the bandwidth can be discarded, reducing transmission bandwidth.
Frequency Modulation (FM)
- The modulating signal alters the carrier signal's frequency (fc).
- Has a significantly higher bandwidth than AM.
- Bandwidth is approximately 10 times the signal frequency.
- Total bandwidth: BFM = 2(1 + β)B, where β is typically 4.
Phase Modulation (PM)
- The modulating signal changes only the phase of the carrier signal.
- This phase change indirectly affects frequency, with instantaneous frequency change proportional to the modulating signal's amplitude derivative.
- Bandwidth is higher than AM.
- Total bandwidth: BPM = 2(1 + β)B, where β is often 2.
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Description
This quiz covers the fundamentals of analog-to-analog conversion, including modulation techniques such as Amplitude Modulation (AM), Frequency Modulation (FM), and Phase Modulation (PM). Learn about the characteristics and bandwidth requirements of each method. Test your knowledge of how these modulation techniques represent analog information.
