IT2311 Communication Systems
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What is the primary purpose of a transmitter in a communication system?

  • To receive and decode the electronic signal
  • To amplify the electronic signal for better clarity
  • To store messages for future use
  • To convert messages into an electronic form suitable for transmission (correct)

    • Which of the following best describes the function of a communication channel?

  • To serve as the medium for transmitting electronic signals from sender to receiver (correct)
  • To convert physical signals into electronic signals
  • To process and edit the received messages
  • To store and retrieve information as needed

    • Which component is NOT typically involved in a communication system?

  • Communication channel
  • Transmitter
  • Receiver
  • Storage device (correct)

    • Which of the following is an example of an optical communication channel?

    <p>Fiber-optic cable</p> Signup and view all the answers

    What type of communication system uses the atmosphere as its medium?

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

    Which device would most likely be used to convert sound waves into an electronic audio signal?

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

    Who was responsible for the invention of the telephone?

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

    In a communication system, what converts physical characteristics like temperature into electronic signals?

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

    What significant event occurred in 1920?

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

    Which communication channel type is most often used for carrying long-distance calls and Internet communications?

    <p>Optical media</p> Signup and view all the answers

    Which inventor is associated with the discovery of radio waves?

    <p>Heinrich Hertz</p> Signup and view all the answers

    What was invented by Bell Laboratories in 1948?

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

    Which year marks the development and first use of the Internet?

    <p>1982-1990</p> Signup and view all the answers

    Who developed the first smartphones between 1996 and 2001?

    <p>BlackBerry, Nokia, and Palm</p> Signup and view all the answers

    What innovation was introduced in 2007?

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

    Which event started in 2019?

    <p>Beginning of 5G cellular service</p> Signup and view all the answers

    What is the primary function of amplifiers in a receiver?

    <p>To increase the strength of the input signal</p> Signup and view all the answers

    Which component in a receiver is responsible for combining different electronic signals?

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

    In the communication system block diagram, which component is responsible for transmitting the message?

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

    What does a tuned circuit primarily consist of?

    <p>An inductor and a capacitor</p> Signup and view all the answers

    Which step comes immediately after the receiver in the communication process?

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

    What is the role of filters in a receiver?

    <p>To amplify specific frequencies while attenuating others</p> Signup and view all the answers

    What fundamental technology underlies active sonars for underwater object detection?

    <p>Echo-reflecting technique</p> Signup and view all the answers

    Which of these milestones in electronic communication occurred first?

    <p>Invention of the telephone by Alexander Graham Bell</p> Signup and view all the answers

    What defines simplex communication?

    <p>Only one device can transmit to another without response</p> Signup and view all the answers

    Which of the following is an example of simplex communication?

    <p>Remote control of a drone</p> Signup and view all the answers

    What is a characteristic of full duplex communication?

    <p>Two parties can communicate simultaneously</p> Signup and view all the answers

    Which communication method allows for some communication but does not permit simultaneous send and receive?

    <p>Half duplex</p> Signup and view all the answers

    In which scenario does simplex downlink communication occur?

    <p>Satellite transmitting TV programming to a home antenna</p> Signup and view all the answers

    What is the role of the uplink in simplex communication?

    <p>To send programming material to a satellite</p> Signup and view all the answers

    Which of the following statements accurately describes duplex communication?

    <p>It can be categorized into full and half duplex</p> Signup and view all the answers

    What type of communication is utilized in a telephone call?

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

    What does a short sine wave duration represent in continuous-wave signals?

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

    Which binary representation corresponds to the capital letter R in Morse code?

    <p>.-.</p> Signup and view all the answers

    What is ASCII commonly used for?

    <p>Representing digital codes</p> Signup and view all the answers

    In the conversion of a letter to binary code, what do 0s represent?

    <p>Starting voltage</p> Signup and view all the answers

    How are Morse code signals represented in continuous-wave (CW) code?

    <p>By turning a sine wave signal on and off</p> Signup and view all the answers

    Which of the following statements is true regarding binary codes?

    <p>Binary codes represent letters, numbers, or symbols.</p> Signup and view all the answers

    What does a long sine wave duration represent in continuous-wave signals?

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

    Which describes the representation of the letter V in binary code?

    <p>01010</p> Signup and view all the answers

    Study Notes

    Basics of Communication Systems

    • Communication involves exchanging messages between senders and receivers, which can be verbal, nonverbal, print, or electronic.
    • In electronics, a communication system comprises a transmitter, communication channel, and receiver.
    • Information is often conveyed as an electronic signal.

    Transmitter

    • Converts messages into electronic forms for transmission.
    • Examples include:
      • Microphones turning sound into audio signals.
      • Cameras converting light to video signals.
      • Keyboards sending binary codes to computers.
      • Transducers converting physical characteristics (temperature, pressure) into electronic signals.

    Communication Channel

    • The medium through which electronic signals travel.
    • Types of channels include:
      • Electrical Conductors: Materials (like metals) that allow electrical flow.
      • Optical Media: Fiber-optic cables and light pipes that carry signals via light waves.
      • Free Space: Used in wireless communication (radio).
      • Water: Utilized in sonar systems for underwater communication.

    Receiver

    • Comprising electronic components that decode transmitted messages.
    • Key components include:
      • Amplifiers: Boost input signals.
      • Oscillators: Generate continuous waveforms.
      • Mixers: Combine multiple signals into fewer outputs.
      • Tuned Circuits: Responsive to specific frequencies.
      • Filters: Allow specific frequency amplification while reducing others.

    Block Diagram of Communication Systems

    • The process involves five blocks:
      • Information Source, Transmitter, Channel, Receiver, Destination.
    • Begins with the origin of the message and ends with processing at the destination.

    History of Communication Systems

    • Important milestones span from the telegraph's invention in 1837 to the rise of smartphones.
    • Key events include:
      • 1837: Telegraph invented by Samuel Morse.
      • 1876: Telephone invented by Alexander Graham Bell.
      • 1887: Radio waves discovered by Heinrich Hertz.
      • 1901: First transatlantic radio contact by Guglielmo Marconi.
      • 1920: First radio broadcast by KDKA in Pittsburgh.
      • 2007: Development of Apple’s iPhone.

    Categories of Electronic Communication

    • Divided into one-way (simplex) and two-way (duplex) transmissions.
    • Simplex Communication: One-way transmission where the receiver cannot respond (e.g., TV broadcast).
    • Duplex Communication:
      • Full Duplex: Simultaneous two-way communication, like a phone call.
      • Half Duplex: Alternating two-way communication (e.g., walkie-talkies).

    Continuous-Wave (CW) Code

    • Represents dots and dashes using on/off sine wave signals.
    • Used in Morse Code, where a short wave is a dot and a long wave is a dash.

    Binary Codes and ASCII

    • Binary codes encode numbers, letters, and symbols for digital communication.
    • The American Standard Code for Information Interchange (ASCII) is widely utilized for representing text in computers.

    Binary and ASCII Code Values

    • Conversion from text to binary code involves mapping characters to defined binary values using ASCII.

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    Quiz Team

    Description

    This quiz covers the basics of communication systems as outlined in Frenzel's 2022 work. It explores the various forms of communication including verbal, nonverbal, and electronic channels. Understand the essential processes and methods used in exchanging messages between senders and receivers.

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