WorksheetsFundamentals of Analog Communication
Total questions: 20
Worksheet time: 15mins
What is Amplitude Modulation (AM)?
A method of varying the frequency of a carrier wave
Amplitude Modulation (AM) is a method of varying the amplitude of a carrier wave to encode information.
A technique for digital signal processing
A way to increase the bandwidth of a signal
How does Frequency Modulation (FM) differ from AM?
FM differs from AM in that FM varies frequency while AM varies amplitude.
FM varies amplitude while AM varies frequency.
FM and AM both vary frequency in the same way.
FM is used exclusively for digital signals while AM is for analog signals.
What is the principle behind Phase Modulation (PM)?
Varying the frequency of a carrier signal based on the input signal.
The principle behind Phase Modulation (PM) is varying the phase of a carrier signal according to the amplitude of the input signal.
Modulating the carrier signal by altering its bandwidth in response to the input signal.
Changing the amplitude of the carrier signal according to the frequency of the input signal.
Define Signal-to-Noise Ratio (SNR).
The ratio of the signal frequency to the noise frequency.
Signal-to-Noise Ratio (SNR) is the ratio of the power of a signal to the power of background noise, often expressed in decibels (dB).
The measurement of signal duration compared to noise duration.
The difference in amplitude between the signal and noise.
What are the main differences between analog and digital communication?
Analog communication is faster than digital communication.
Analog communication uses continuous signals; digital communication uses discrete signals.
Digital communication uses continuous signals; analog uses discrete signals.
Analog communication is more secure than digital communication.
List three common modulation techniques used in analog communication.
Pulse Code Modulation (PCM)
Amplitude Modulation (AM), Frequency Modulation (FM), Phase Modulation (PM)
Quadrature Amplitude Modulation (QAM)
Amplitude Shift Keying (ASK)
What is the role of a carrier signal in AM?
The carrier signal is used to amplify the audio signal.
The carrier signal modulates frequency to transmit data.
The carrier signal transmits data by changing its phase.
The carrier signal in AM carries the information by varying its amplitude.
Explain the concept of bandwidth in FM.
The bandwidth in FM is approximately 2(Δf + fm), where Δf is the frequency deviation and fm is the maximum modulating frequency.
The bandwidth in FM is determined solely by the carrier frequency.
Bandwidth in FM is equal to the maximum modulating frequency only.
The bandwidth in FM is calculated as 2 times the carrier frequency.
How does noise affect the quality of an analog signal?
Noise has no effect on the quality of an analog signal.
Noise improves the clarity of an analog signal by filtering out unwanted frequencies.
Noise negatively affects the quality of an analog signal by introducing distortion and reducing clarity.
Noise enhances the quality of an analog signal by adding richness.
What is the significance of the modulation index in FM?
The modulation index determines the frequency of the carrier wave.
The modulation index has no impact on signal clarity.
The modulation index is significant as it affects the bandwidth and quality of the FM signal.
The modulation index is only relevant in AM signals.
Describe the process of demodulation in analog communication.
Demodulation involves encoding the original information signal into a new carrier wave.
Demodulation is the process of amplifying the modulated carrier wave.
Demodulation is the process of extracting the original information signal from a modulated carrier wave.
Demodulation is the process of generating a modulated carrier wave from the original signal.
What are the advantages of using FM over AM?
FM is less efficient in bandwidth usage compared to AM.
FM is more susceptible to interference than AM.
FM provides better sound quality, noise resistance, and longer transmission range compared to AM.
FM has a shorter transmission range than AM.
How does phase modulation encode information?
Phase modulation encodes information by varying the phase of a carrier wave.
Phase modulation encodes information by varying the voltage of the signal.
Phase modulation encodes information by changing the amplitude of a carrier wave.
Phase modulation encodes information by altering the frequency of a carrier wave.
What is the impact of SNR on communication systems?
SNR has no effect on communication systems.
SNR impacts communication systems by affecting signal clarity and error rates; higher SNR improves performance, while lower SNR degrades it.
SNR only affects the physical layer of communication.
Lower SNR always improves performance.
Explain the term 'modulation depth' in AM.
Modulation depth is the frequency of the carrier wave.
Modulation depth refers to the duration of the modulating signal.
Modulation depth is the total power of the carrier wave.
Modulation depth is the ratio of the peak amplitude of the modulating signal to the amplitude of the carrier wave, expressed as a percentage.
What are the applications of analog communication systems?
Radio broadcasting, television transmission, telephone systems, audio/video recording, remote sensing, telemetry, industrial control systems.
Fiber optic communication
Digital photography
Satellite navigation
How does the frequency of the carrier affect FM signals?
The carrier frequency has no impact on signal quality.
The carrier frequency only affects the transmission distance.
The frequency of the carrier affects the bandwidth and fidelity of FM signals.
The carrier frequency determines the modulation type used.
What is the difference between narrowband and wideband FM?
Narrowband FM has a smaller bandwidth and frequency deviation compared to wideband FM, which has a larger bandwidth and higher audio quality.
Narrowband FM has a higher bandwidth than wideband FM.
Narrowband FM provides better audio quality than wideband FM.
Wideband FM is used for AM radio broadcasting.
Describe the concept of sidebands in AM.
Sidebands are the main frequency of the carrier wave.
Sidebands do not carry any information from the modulating signal.
Sidebands in AM are the upper and lower frequency components created by modulating a carrier wave, carrying the information of the modulating signal.
Sidebands are only present in frequency modulation (FM).
What factors influence the choice of modulation technique in a communication system?
Factors include bandwidth efficiency, power efficiency, noise resilience, implementation complexity, channel type, and data rate requirements.
Geographical location of users
User interface design
Cost of equipment
