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Questions and Answers
What is the main difference between a time-domain plot and a frequency-domain plot?
What is the main difference between a time-domain plot and a frequency-domain plot?
- Time-domain plots are more commonly used in data communications, while frequency-domain plots are more commonly used in audio analysis.
- Frequency-domain plots are only used for periodic signals, while time-domain plots can be used for both periodic and non-periodic signals.
- Time-domain plots show changes in amplitude over time, while frequency-domain plots show the relationship between amplitude and frequency. (correct)
- Time-domain plots show the phase of the signal, while frequency-domain plots do not.
What is the bandwidth of a composite signal?
What is the bandwidth of a composite signal?
- The average frequency of all the frequencies contained in the signal.
- The sum of the amplitudes of all the frequencies contained in the signal.
- The difference between the highest and lowest frequencies contained in the signal. (correct)
- The total number of frequencies contained in the signal.
If a composite signal is non-periodic, what happens during its decomposition?
If a composite signal is non-periodic, what happens during its decomposition?
- The composite signal cannot be decomposed at all, since it is non-periodic.
- The composite signal can be decomposed into a series of simple sine waves with the same frequency, but different amplitudes and phases.
- The composite signal can be decomposed into a combination of sine waves with continuous frequencies. (correct)
- The composite signal can be decomposed into a series of simple sine waves with discrete frequencies.
Which of the following statements about periodic and non-periodic composite signals is true?
Which of the following statements about periodic and non-periodic composite signals is true?
What is the main purpose of using a composite signal in data communications?
What is the main purpose of using a composite signal in data communications?
Which of the following is a characteristic of digital signals?
Which of the following is a characteristic of digital signals?
What is the frequency of a periodic signal with a period of 50 milliseconds?
What is the frequency of a periodic signal with a period of 50 milliseconds?
Which of the following signals is aperiodic?
Which of the following signals is aperiodic?
What is the peak amplitude of a sine wave that varies between -5 and 5 volts?
What is the peak amplitude of a sine wave that varies between -5 and 5 volts?
Which of the following is a characteristic of digital signals?
Which of the following is a characteristic of digital signals?
What is the phase of a cosine wave that starts at its maximum value?
What is the phase of a cosine wave that starts at its maximum value?
If the frequency of a periodic signal is doubled, what happens to its period?
If the frequency of a periodic signal is doubled, what happens to its period?
What is the frequency of a signal with a period of 100ms?
What is the frequency of a signal with a period of 100ms?
Which of the following best describes an aperiodic analog signal?
Which of the following best describes an aperiodic analog signal?
What is a digital signal?
What is a digital signal?
Which of the following is an example of a periodic digital signal?
Which of the following is an example of a periodic digital signal?
How are digital signals categorized?
How are digital signals categorized?
What is the key difference between an analog aperiodic signal and a digital aperiodic signal?
What is the key difference between an analog aperiodic signal and a digital aperiodic signal?
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