IT2311 Communication Systems Basics
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Questions and Answers

What technique do active sonars use to determine the distance and direction of underwater objects?

  • Sound reflection
  • Echo-reflecting (correct)
  • Infrared signals
  • Radar transmission

    • Which component in a receiver is responsible for increasing the input signal?

  • Amplifiers (correct)
  • Mixers
  • Oscillators
  • Filters

    • What is the primary function of tuned circuits in a receiver?

  • To filter out all signals
  • To create a continuous waveform
  • To amplify all frequencies equally
  • To respond to a specific frequency (correct)

    • In the block diagram of communication systems, which block represents the initial source of the message?

    <p>Information Source</p> Signup and view all the answers

    Which component in a receiver combines multiple electronic signals into one output signal?

    <p>Mixers</p> Signup and view all the answers

    What key milestone in electronic communication occurred in 2007?

    <p>Launch of the Apple iPhone</p> Signup and view all the answers

    What is the role of filters in a receiver?

    <p>To isolate specific frequencies while suppressing others</p> Signup and view all the answers

    Which of the following diagrams represents the elements of a communication system in correct order?

    <p>Information Source, Transmitter, Channel, Receiver, Destination</p> Signup and view all the answers

    Who invented the telephone?

    <p>Alexander Graham Bell</p> Signup and view all the answers

    What was the first event to occur in the timeline provided?

    <p>The invention of the telegraph</p> Signup and view all the answers

    Which of the following inventions is associated with Heinrich Hertz?

    <p>Radio waves</p> Signup and view all the answers

    Which company is associated with the first smartphones?

    <p>BlackBerry</p> Signup and view all the answers

    What is significant about the year 2007?

    <p>The development of Apple's iPhone</p> Signup and view all the answers

    What technology did Tim Berners-Lee develop between 1982 and 1990?

    <p>The Internet</p> Signup and view all the answers

    What is the primary function of a transmitter in a communication system?

    <p>To convert messages into electronic form suitable for transmission</p> Signup and view all the answers

    Which of the following is NOT a type of communication channel mentioned?

    <p>Chemical Transmission</p> Signup and view all the answers

    Which of these events happened first in the timeline?

    <p>The first transatlantic radio contact</p> Signup and view all the answers

    Which invention is attributed to Bell Laboratories?

    <p>The transistor</p> Signup and view all the answers

    How does a camera function within a transmitter for television communication?

    <p>It converts light information into video signals</p> Signup and view all the answers

    What role do transducers play in communication systems?

    <p>They convert physical characteristics into electronic signals</p> Signup and view all the answers

    What medium is described as being used for underwater communication in sonar systems?

    <p>Water</p> Signup and view all the answers

    Which statement accurately describes free space as a communication channel?

    <p>It enables point-to-point wireless communication.</p> Signup and view all the answers

    What electronic form is suitable for typing messages in computer systems?

    <p>Binary codes</p> Signup and view all the answers

    Which of the following best defines communication in its simplest form?

    <p>Exchanging messages between a sender and receiver</p> Signup and view all the answers

    What defines simplex communication?

    <p>One-way communication where the receiver cannot respond.</p> Signup and view all the answers

    In the context of simplex communication, what is a simplex uplink?

    <p>Transmission from a ground station to a satellite.</p> Signup and view all the answers

    Which of the following represents full duplex communication?

    <p>A telephone conversation where both parties can talk and listen at the same time.</p> Signup and view all the answers

    What is the key characteristic of half duplex communication?

    <p>Communication can occur in both directions, but not at the same time.</p> Signup and view all the answers

    Which of the following is an example of simplex communication?

    <p>TV broadcasting.</p> Signup and view all the answers

    Which type of communication allows devices to send and receive signals simultaneously?

    <p>Full duplex.</p> Signup and view all the answers

    What type of communication is occurring when a drone's camera transmits video back to the operator?

    <p>Duplex communication.</p> Signup and view all the answers

    Which of the following statements about electronic communication is false?

    <p>Simplex communication allows for feedback from the receiver.</p> Signup and view all the answers

    What defines a half-duplex communication?

    <p>Participants take turns transmitting and receiving.</p> Signup and view all the answers

    Which of the following is an example of an analog signal?

    <p>Voice</p> Signup and view all the answers

    Which characteristic distinguishes digital signals from analog signals?

    <p>Digital signals vary in discrete increments.</p> Signup and view all the answers

    In Morse code, what is the space between letters measured in?

    <p>Three units</p> Signup and view all the answers

    Which of the following describes the length of a dash in Morse code?

    <p>Three units</p> Signup and view all the answers

    What type of communication device is an example of half-duplex communication?

    <p>Walkie-talkie</p> Signup and view all the answers

    Which of the following best represents an analog signal?

    <p>Changing temperature reading</p> Signup and view all the answers

    What is a common application of half-duplex communication?

    <p>Marine radio transmissions</p> Signup and view all the answers

    Study Notes

    Basics of Communication Systems

    • Communication is the exchange of messages between a sender and receiver, including verbal and nonverbal forms.
    • Electronic communication systems involve a transmitter, communication channel, and receiver using electronic signals.
    • Information or intelligence signals are transformed into electronic formats for transmission, such as sound to audio signals or typed text to binary codes.

    Transmitter

    • Converts various forms of information (audio, video, data) into electronic signals.
    • Common devices include microphones (for audio), cameras (for video), and keyboards (for data input).
    • Physical characteristics (temperature, pressure) are converted into electronic signals via transducers.

    Communication Channel

    • Acts as the medium for transmitting signals from sender to receiver.
    • Types include:
      • Electrical Conductors: Materials like wires transporting electrical signals.
      • Optical Media: Fiber-optic cables transmitting signals via light waves.
      • Free Space: Used in radio communications, facilitating wireless transmission.
      • Special Channels: Such as sonar, utilizing water for underwater signals.

    Receiver

    • Comprises components that accept transmitted signals and convert them back into understandable forms.
    • Key components include:
      • Amplifiers: Enhance input signals.
      • Oscillators: Generate continuous waveforms.
      • Mixers: Combine signals.
      • Tuned Circuits: Respond to specific frequencies.
      • Filters: Amplify certain frequencies while reducing others.

    Block Diagram of Communication Systems

    • The system includes five blocks: Information Source, Transmitter, Channel, Receiver, and Destination.
    • Begins with information sourcing and ends with the destination processing the received message.

    History of Communication Systems

    • Significant milestones include:
      • 1837: Telegraph by Samuel Morse.
      • 1876: Telephone by Alexander Graham Bell.
      • 1887: Discovery of radio waves by Heinrich Hertz.
      • 1920: First radio broadcast (KDKA, Pittsburgh).
      • 2007: Development of Apple’s iPhone, marking the rise of smartphones.

    Categories of Electronic Communication

    • Classifications based on transmission types:
      • Simplex Communication: One-way communication like TV broadcasting (e.g., satellite downlink).
      • Duplex Communication: Two-way communication, further divided into:
        • Full Duplex: Simultaneous transmission and reception (e.g., telephone conversations).
        • Half Duplex: Alternating transmission (e.g., walkie-talkies).

    Analog Signal

    • Represents information in continuously varying forms, including sine waves and voice signals.
    • Common in physical measurements (temperature, light) detected by sensors.

    Digital Signal

    • Characterized by discrete variations rather than continuous changes.
    • Includes coded communications such as Morse code or binary representations.
    • Morse code uses short (dots) and long (dashes) signals, with specific timing conventions for spacing between dots, letters, and words.

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    Description

    Explore the fundamentals of communication systems with this quiz. Learn about the exchange of messages between senders and receivers, including both verbal and nonverbal communication. Delve into various channels like smartphones and computers that facilitate communication.

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