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Signal Processing and Communication Systems

Description: This quiz covers fundamental concepts and techniques used in Signal Processing and Communication Systems.
Number of Questions: 14
Created by:
Tags: signal processing communication systems fourier analysis modulation sampling
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Which of the following is not a type of signal processing filter: low-pass, high-pass, band-pass, or all-pass?

  1. Low-pass

  2. High-pass

  3. Band-pass

  4. All-pass

Show answer
Correct Option: D
Explanation:

All-pass filters are not a type of signal processing filter because they do not attenuate or amplify any frequency components of the input signal.

In the context of communication systems, what is the purpose of modulation?

  1. To increase the signal-to-noise ratio

  2. To reduce the bandwidth required for transmission

  3. To improve the security of the transmitted data

  4. To enable multiplexing of multiple signals

Show answer
Correct Option: B
Explanation:

Modulation is used to reduce the bandwidth required for transmission by shifting the signal to a higher frequency range.

What is the Nyquist sampling rate?

  1. Twice the highest frequency component of the signal

  2. Half the highest frequency component of the signal

  3. The same as the highest frequency component of the signal

  4. Four times the highest frequency component of the signal

Show answer
Correct Option: A
Explanation:

The Nyquist sampling rate is twice the highest frequency component of the signal, which ensures that the signal can be reconstructed without distortion.

Which of the following is not a type of modulation: amplitude modulation (AM), frequency modulation (FM), phase modulation (PM), or single-sideband modulation (SSB)?

  1. Amplitude modulation (AM)

  2. Frequency modulation (FM)

  3. Phase modulation (PM)

  4. Single-sideband modulation (SSB)

Show answer
Correct Option: D
Explanation:

Single-sideband modulation (SSB) is not a type of modulation, but rather a technique used in AM and FM to reduce the bandwidth required for transmission.

What is the purpose of a Fourier transform in signal processing?

  1. To convert a signal from the time domain to the frequency domain

  2. To convert a signal from the frequency domain to the time domain

  3. To remove noise from a signal

  4. To compress a signal

Show answer
Correct Option: A
Explanation:

The Fourier transform is used to convert a signal from the time domain to the frequency domain, which allows for the analysis of the signal's frequency components.

In a communication system, what is the role of a receiver?

  1. To generate the carrier signal

  2. To modulate the signal

  3. To demodulate the signal

  4. To amplify the signal

Show answer
Correct Option: C
Explanation:

The receiver in a communication system demodulates the received signal to extract the original information.

What is the difference between analog and digital signals?

  1. Analog signals are continuous in time and amplitude, while digital signals are discrete in time and amplitude

  2. Analog signals are discrete in time and amplitude, while digital signals are continuous in time and amplitude

  3. Analog signals are continuous in time but discrete in amplitude, while digital signals are discrete in time but continuous in amplitude

  4. Analog signals are both continuous in time and amplitude, while digital signals are both discrete in time and amplitude

Show answer
Correct Option: A
Explanation:

Analog signals are continuous in both time and amplitude, while digital signals are discrete in both time and amplitude.

Which of the following is not a type of noise in communication systems: white noise, pink noise, brown noise, or blue noise?

  1. White noise

  2. Pink noise

  3. Brown noise

  4. Blue noise

Show answer
Correct Option: D
Explanation:

Blue noise is not a type of noise in communication systems. White noise, pink noise, and brown noise are all types of noise with different spectral characteristics.

What is the purpose of a multiplexer in a communication system?

  1. To combine multiple signals into a single signal for transmission

  2. To separate multiple signals from a single signal at the receiver

  3. To amplify the signal

  4. To modulate the signal

Show answer
Correct Option: A
Explanation:

A multiplexer is used to combine multiple signals into a single signal for transmission over a single channel.

Which of the following is not a type of error control coding: block codes, convolutional codes, turbo codes, or Hamming codes?

  1. Block codes

  2. Convolutional codes

  3. Turbo codes

  4. Hamming codes

Show answer
Correct Option: C
Explanation:

Turbo codes are not a type of error control coding. Block codes, convolutional codes, and Hamming codes are all types of error control coding.

What is the purpose of a guard interval in an OFDM system?

  1. To prevent inter-symbol interference

  2. To reduce the bandwidth required for transmission

  3. To improve the signal-to-noise ratio

  4. To enable multiplexing of multiple signals

Show answer
Correct Option: A
Explanation:

A guard interval in an OFDM system is used to prevent inter-symbol interference caused by the overlapping of adjacent symbols.

Which of the following is not a type of spread spectrum modulation: direct sequence spread spectrum (DSSS), frequency hopping spread spectrum (FHSS), or time hopping spread spectrum (THSS)?

  1. Direct sequence spread spectrum (DSSS)

  2. Frequency hopping spread spectrum (FHSS)

  3. Time hopping spread spectrum (THSS)

Show answer
Correct Option: C
Explanation:

Time hopping spread spectrum (THSS) is not a type of spread spectrum modulation. Direct sequence spread spectrum (DSSS) and frequency hopping spread spectrum (FHSS) are both types of spread spectrum modulation.

What is the purpose of a Viterbi decoder in a communication system?

  1. To decode convolutional codes

  2. To decode block codes

  3. To decode turbo codes

  4. To decode Hamming codes

Show answer
Correct Option: A
Explanation:

A Viterbi decoder is used to decode convolutional codes, which are a type of error control coding.

Which of the following is not a type of digital modulation: amplitude shift keying (ASK), frequency shift keying (FSK), phase shift keying (PSK), or quadrature amplitude modulation (QAM)?

  1. Amplitude shift keying (ASK)

  2. Frequency shift keying (FSK)

  3. Phase shift keying (PSK)

  4. Quadrature amplitude modulation (QAM)

Show answer
Correct Option: D
Explanation:

Quadrature amplitude modulation (QAM) is not a type of digital modulation. Amplitude shift keying (ASK), frequency shift keying (FSK), and phase shift keying (PSK) are all types of digital modulation.

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