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Questions and Answers
What occurs when the level of the message signal is equal to the level of the carrier signal?
What occurs when the level of the message signal is equal to the level of the carrier signal?
- The carrier signal is completely suppressed.
- The modulation is at 50%.
- The carrier signal is said to be distorted.
- The carrier is said to be fully modulated. (correct)
What characterizes the time domain presentation of an amplitude-modulated wave?
What characterizes the time domain presentation of an amplitude-modulated wave?
- It displays the modulation percentage of the carrier signal.
- It shows constant wave amplitude with varying frequency.
- It depicts the wave amplitude changing in accordance with the message signal. (correct)
- It represents the energy levels of the modulated signals.
How does the relationship between $E_{max}$ and $E_{min}$ affect the modulated wave?
How does the relationship between $E_{max}$ and $E_{min}$ affect the modulated wave?
- They have no impact on the modulation process.
- They determine the frequency of the carrier signal.
- They are mirror images of each other. (correct)
- They are dramatically different, leading to distortion.
At what total amplitude does 100% modulation occur during the amplitude modulation process?
At what total amplitude does 100% modulation occur during the amplitude modulation process?
What best describes the frequency relationship between the carrier signal and the message signal in amplitude modulation?
What best describes the frequency relationship between the carrier signal and the message signal in amplitude modulation?
Flashcards
Mirror Image Symmetry in AM
Mirror Image Symmetry in AM
The highest and lowest points of an amplitude-modulated wave are symmetrical around the carrier signal level. This means they are mirror images of each other.
Amplitude at E_max and E_min
Amplitude at E_max and E_min
When the modulated wave reaches its maximum amplitude (E_max), the amplitude is twice the carrier signal amplitude (E_c). When the wave reaches its minimum amplitude (E_min), the amplitude is zero.
100% Modulation
100% Modulation
The carrier signal is completely controlled by the message signal. The amplitude of the modulated wave fluctuates between twice the carrier amplitude (E_max) and zero (E_min).
Time Domain Presentation
Time Domain Presentation
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Carrier and Message Frequency in AM
Carrier and Message Frequency in AM
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Study Notes
Amplitude Modulation Principles
- Amplitude modulation (AM) reduces the carrier wave by the message signal.
- Positive and negative peaks of the modulated wave mirror each other.
- 100% modulation occurs when the message signal equals the carrier signal.
- At 100% modulation, the total amplitude is 2E.
- The time domain display (Figure 1.1) shows a plot of wave amplitude over time.
- The carrier frequency remains constant.
- The amplitude changes according to the message signal's size and frequency.
- The carrier frequency is notably higher than the message signal frequency.
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Description
Explore the principles of amplitude modulation (AM) in this quiz. Understand how the carrier wave is altered by the message signal, learn about 100% modulation, and examine the time domain display of wave amplitude over time. This quiz will enhance your understanding of AM in communication systems.
