Podcast
Questions and Answers
What is the main problem faced by several radio stations broadcasting audio baseband signals directly?
What is the main problem faced by several radio stations broadcasting audio baseband signals directly?
- Lack of tunable bandpass filters
- Inability to use modulation
- Insufficient channel bandwidth
- Interference between signals due to overlapping spectra (correct)
What is the purpose of modulation in frequency-division multiplexing (FDM)?
What is the purpose of modulation in frequency-division multiplexing (FDM)?
- To digitize analog signals
- To translate each signal to a different frequency range (correct)
- To reduce noise in the channel
- To increase the channel bandwidth
What is the primary advantage of frequency-division multiplexing (FDM) over direct broadcasting?
What is the primary advantage of frequency-division multiplexing (FDM) over direct broadcasting?
- Improved signal-to-noise ratio
- Efficient use of channel bandwidth by multiple signals (correct)
- Reduced signal processing requirements
- Increased channel bandwidth
What is the function of a tunable bandpass filter in a receiver using frequency-division multiplexing (FDM)?
What is the function of a tunable bandpass filter in a receiver using frequency-division multiplexing (FDM)?
What is the name of the technique that shares the channel bandwidth by transmitting different signals at different time intervals?
What is the name of the technique that shares the channel bandwidth by transmitting different signals at different time intervals?
What is the primary goal of modulation in digital communications?
What is the primary goal of modulation in digital communications?
What is a major limitation of using baseband signals for transmission?
What is a major limitation of using baseband signals for transmission?
What is the primary purpose of modulation in digital communications?
What is the primary purpose of modulation in digital communications?
Why is modulation necessary for the simultaneous transmission of several signals?
Why is modulation necessary for the simultaneous transmission of several signals?
What determines the wavelength of a signal?
What determines the wavelength of a signal?
What is the primary advantage of using digital modulation over analog modulation?
What is the primary advantage of using digital modulation over analog modulation?
What is the relationship between the wavelength of a signal and its antenna requirements?
What is the relationship between the wavelength of a signal and its antenna requirements?
What is the significance of Shannon’s result in communication systems?
What is the significance of Shannon’s result in communication systems?
Why are practical communication systems unable to achieve the Shannon rate?
Why are practical communication systems unable to achieve the Shannon rate?
What is the purpose of modulation in communication systems?
What is the purpose of modulation in communication systems?
What is the process of reversing modulation called?
What is the process of reversing modulation called?
What type of modulation varies the carrier amplitude in proportion to the baseband signal?
What type of modulation varies the carrier amplitude in proportion to the baseband signal?
What is the name of the high-frequency signal used in modulation?
What is the name of the high-frequency signal used in modulation?
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