Questions and Answers
What is the function of a transmitter in a communication system?
To convert the electrical signal to a signal suitable for transmission over a communication medium.
What does a receiver do in a communication system?
It accepts the transmitted message from the channel and converts it back to a form understandable by humans.
Which of the following are components of a communication system? (Select all that apply)
Attenuation is inevitable in communication systems.
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How is noise expressed in communication systems?
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What type of communication is defined as one-way communication?
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Which of the following signals vary continuously?
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Full-duplex communication allows for both parties to communicate simultaneously.
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_____ transmission directly puts the original signals into the medium.
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What are the two most common methods of modulation?
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Which modulation technique varies the amplitude of the carrier signal?
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In frequency modulation (FM), the baseband information signal varies the _____ of the higher-frequency carrier signal.
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What device is used to convert data for transmission over communication channels?
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Study Notes
Communication Systems Overview
- Transmitter: Converts electrical signals into suitable signals for transmission using oscillators, amplifiers, and modulators.
- Communication Channel: The medium (e.g., wire, fiber optics, sonar) through which signals are transmitted from transmitter to receiver.
- Receiver: Accepts transmitted messages and converts them back for human interpretation, using demodulators and amplifiers.
- Transceivers: Combined transmitter and receiver in one device that can send and receive signals, typically sharing power supply and circuit components.
- Attenuation: The reduction of signal strength over distance, proportional to the square of the distance.
- Noise: Undesired electrical signals affecting communication, measured by signal-to-noise ratio (SNR) in Decibels (dB).
Types of Electronic Communications
- Simplex: One-way communication.
- Duplex: Two-way communication, but not simultaneous.
- Full-Duplex: Two-way communication that occurs simultaneously.
Signal Types
- Analog Signals: Continuous varying signals representing information, such as voice and video waves.
- Digital Signals: Discrete signals that switch in steps, typically using binary codes.
Modulation and Multiplexing
- Purpose: Enhance compatibility of signals with communication mediums and allow multiple signals to share one medium.
- Baseband Transmission: Direct transmission of original signals (voice/video) over mediums like twisted-pair cables without modification.
- Broadband Transmission: Baseband signals modify a higher-frequency carrier signal for transmission.
- Common Modulation Techniques:
- Amplitude Modulation (AM): Varies the amplitude of the carrier signal.
- Frequency Modulation (FM): Varies the frequency of the carrier signal.
- Phase Modulation (PM): Varies the phase angle of the carrier signal and resembles FM.
- Frequency Shift Keying (FSK): Converts data into varying frequency tones.
- Phase Shift Keying (PSK): Implements a 180° phase shift to encode data.
Summary
- Understanding modulation and multiplexing is fundamental to grasping modern communication systems. Mastery of these concepts enables comprehension of how diverse communication technology operates effectively.
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Description
This quiz covers essential concepts in communication systems, including types of electronic communication, modulation, multiplexing, and noise analysis. Designed for students of electrical and computer engineering, it aims to enhance understanding of how signals are transmitted effectively over various media.
