20 Questions
What is the primary purpose of modulation in communication systems?
To move the message signal into a specific frequency band
Which type of communication systems utilize digital modulation?
Second and third generation cellular phone systems
What is the frequency band of the baseband for a telephony system?
0 - 3 kHz
Which type of communication systems does not use modulation?
Baseband communications
What are the advantages of modulation in communication systems?
Ease of RF transmission and frequency division multiplexing
What type of modulation results in amplitude modulation (AM)?
Angle modulation
In baseband communication, why are dedicated user channels assigned to each user for long-distance communications?
To reduce interference between baseband signals
What is the main reason baseband signals cannot be effectively transmitted over radio (wireless) links?
They have significant low-frequency content
Which type of modulation allows utilization of one channel by signals through modulation and shifting of spectra to nonoverlapping bands?
Frequency modulation (FM)
What happens when a sinusoidal signal is modulated by changing the amplitude proportionally to the message signal?
Amplitude modulation (AM)
What type of modulation results in amplitude modulation (AM)?
Pulse code modulation
In baseband communication, why are dedicated user channels assigned to each user for long-distance communications?
To reduce interference between baseband signals
What is the primary purpose of modulation in communication systems?
To shift the frequency spectrum of a signal
What happens when a sinusoidal signal is modulated by changing the amplitude proportionally to the message signal?
Amplitude modulation
Which type of communication systems does not use modulation?
Baseband communication
What is the primary advantage of modulation in communication systems?
Ease of RF transmission and frequency division multiplexing
In which frequency band does baseband communication operate?
0 - 3.5 kHz
What distinguishes carrier communications from baseband communications?
Carrier communications operate at higher frequencies than baseband communications
Which type of communication systems utilize classic analog modulations such as amplitude modulation?
NTSC television signals
What is the function of angle modulation in communication systems?
To shift the spectral content of the message signal to nonoverlapping bands
Test your knowledge on amplitude modulations, demodulations, and the advantages of modulation in traditional and modern communication systems.
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