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IT300-HW2 | Questions and Answers 2024
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IT300-HW2 | Questions and Answers 20241. Select the correct statement(s) regarding the difference between analog and digital signals.
Answers:
a. analog signals are comprised of an infinite number of amplitudes and time slices
b. digital signals are only represented by discrete values of "0s" and "1s", and therefore can
never convey analog information
c. digital signals are more accurate than analog signals; this is why digital music sounds
much better
d. analog networks easily fit into the OSI Reference Model: Selected Answer:
a. analog signals are comprised of an infinite number of amplitudes and time slices
2. A dataword consisting or four bits can be mapped (i.e., encoded) to 16 different symbols.
Answers:
True
False: Selected Answer:
True
3. Select the correct statement(s) regarding frequency division multiplexing (FDM).
Answers:
a. FDM can aggregate either analog or digital channels
b. FDM produces a broadband signal consisting of combined modulated channels
separated by guard channels that contain no information
c. The received FDM aggregate goes through a demultiplexing process that recovers the
separate modulated channels at the receiver
d. all statements are correct: Selected Answer:
d. all statements are correct
4. Select the correct statement regarding modulation/demodulation.
Answers:
a. the passband signal is combined with the carrier wave to produce a base- band which
operates at a higher frequency
b. the carrier signal is combined with the passband wave to produce a base- band which
operates at a higher frequency
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, IT300-HW2 | Questions and Answers 2024
c. the passband signal is combined with the baseband wave to produce a carrier which
operates at a higher frequency
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, IT300-HW2 | Questions and Answers 2024
d. the baseband signal is combined with the carrier wave to produce a pass- band which
operates at a higher frequency: Selected Answer:
d. the baseband signal is combined with the carrier wave to produce a passband which operates at a
higher frequency
5. It is useful to observe an information signal in both the time and frequency domains. The time
domain gives us information about the signal's amplitude over time, while the frequency domain
gives us information regarding signal frequency and bandwidth.
Answers:
True
False: Selected Answer:
True
6. A carrier is a periodic wave that can be represented by either a sine or cosine wave. Once the
carrier is combined with a message (i.e., information) wave, the modulated carrier (i.e., passband
or modulated signal wave) will have a frequency bandwidth that can be viewed in the frequency
domain.
Answers:
True
False: Selected Answer:
True
7. Which carrier signal variables are used to represent baseband message/in- formation in the
modulation process?
Answers:
a. amplitude, bandwidth, time
b. amplitude, frequency, temperature
c. frequency, logical encoding variables, timing
d. amplitude, frequency, phase angle: Selected Answer:
d. amplitude, frequency, phase angle
8. A carrier wave has an amplitude of 2 volts, a frequency of 120 kHz, and -À/2 radian phase
angle. Select the correct carrier wave equation.
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