Introduction to Electronic Communication
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Questions and Answers

Which of the following is NOT a method of communication mentioned?

  • Social media (correct)
  • Telegraph
  • Face to face
  • Written word

Noise has no impact on transmitted information.

False (B)

What are the three basic components of a communication system?

Transmitter, channel (or medium), receiver

The main barriers to communication are language and __________.

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

Match the type of communication with its example:

<p>Telegraph = Electrical innovation Telephone = Electrical innovation Radio = Electrical innovation Letters = Written word</p> Signup and view all the answers

Which application is included in the survey of communication applications?

<p>Television (B)</p> Signup and view all the answers

Contemporary society emphasizes the exchange of information more than accumulation.

<p>False (B)</p> Signup and view all the answers

What is the significance of human communication?

<p>Communication is the process of exchanging information.</p> Signup and view all the answers

Which of the following is an example of a digital signal?

<p>Morse code (B)</p> Signup and view all the answers

Digital signals must always remain in digital form during transmission.

<p>False (B)</p> Signup and view all the answers

What device is used to convert analog signals to digital form?

<p>Analog-to-digital (A/D) converter</p> Signup and view all the answers

In ________ transmission, information can be sent directly and unmodified over the medium.

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

Match each type of transmission with its characteristics:

<p>Baseband Transmission = Direct and unmodified signal transmission Broadband Transmission = Uses carrier signals Modulation = Makes information compatible with the medium Multiplexing = Allows multiple signals to be transmitted concurrently</p> Signup and view all the answers

What is the purpose of modulation in electronic communication?

<p>To make the information signal more compatible with the transmission medium (C)</p> Signup and view all the answers

Broadband transmission relies on modulating a high-frequency carrier signal.

<p>True (A)</p> Signup and view all the answers

What type of waves are radio-frequency (RF) waves?

<p>Electromagnetic signals</p> Signup and view all the answers

What is the main function of a transmitter?

<p>To convert electrical signals into a form suitable for transmission (B)</p> Signup and view all the answers

A receiver is responsible for sending the message across the communication channel.

<p>False (B)</p> Signup and view all the answers

Name one example of a transceiver.

<p>Cell phone</p> Signup and view all the answers

Noise in a communication system refers to __________ electronic energy that interferes with the transmitted message.

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

Match the following components with their functions:

<p>Transmitter = Converts electrical signals for transmission Receiver = Converts signals into understandable form Transceiver = Sends and receives signals Noise = Interferes with the transmitted message</p> Signup and view all the answers

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

<p>Mechanical gears (D)</p> Signup and view all the answers

Attenuation of a signal is inversely proportional to the distance between the transmitter and receiver.

<p>False (B)</p> Signup and view all the answers

What electronic components do receivers contain?

<p>Amplifiers, oscillators, mixers, tuned circuits, filters, demodulator</p> Signup and view all the answers

Which frequency range corresponds to Very High Frequencies (VHF)?

<p>30–300 MHz (A)</p> Signup and view all the answers

The optical spectrum includes infrared, visible, and radio waves.

<p>False (B)</p> Signup and view all the answers

What is one application of infrared radiation?

<p>To detect stars in astronomy.</p> Signup and view all the answers

FM radio broadcasting operates in the _____ frequency range.

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

Which of the following is a usage of Extremely High Frequencies (EHF)?

<p>Satellite communication (A)</p> Signup and view all the answers

Match the frequency bands with their respective applications:

<p>Very High Frequencies (VHF) = FM radio broadcasting Ultra High Frequencies (UHF) = Cellular phones Microwaves (SHF) = Microwave ovens Extremely High Frequencies (EHF) = Radar</p> Signup and view all the answers

What are the three types of light waves in the optical spectrum?

<p>Infrared, visible spectrum, ultraviolet</p> Signup and view all the answers

Infrared radiation is only used in remote control devices.

<p>False (B)</p> Signup and view all the answers

Which of the following is NOT a common method of modulation?

<p>Pulse Modulation (PM) (B)</p> Signup and view all the answers

Phase modulation varies the frequency of the carrier signal.

<p>False (B)</p> Signup and view all the answers

What process allows two or more signals to share the same channel?

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

The modulation and demodulation of signals are performed by a ______.

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

Match the types of multiplexing with their descriptions:

<p>Frequency division = Divides the channel into different frequency slots Time division = Assigns individual time slots for each signal Code division = Uses unique codes to differentiate between signals</p> Signup and view all the answers

What does Frequency-shift keying (FSK) convert data into?

<p>Frequency-varying tones (B)</p> Signup and view all the answers

Demodulation occurs at the transmitter when the original signal is extracted.

<p>False (B)</p> Signup and view all the answers

What is the range of electromagnetic signals encompassing all frequencies called?

<p>Electromagnetic spectrum</p> Signup and view all the answers

Flashcards

Communication Process

The exchange of information between individuals or systems.

Communication Barriers

Obstacles that prevent effective communication, often language or distance.

Communication Methods

Different ways of exchanging information, like face-to-face, signals, writing, and electrical innovations.

Transmitter

Part of a communication system that sends information.

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Communication Channel

The medium used to transmit information between sender and receiver.

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Receiver

Part of a communication system that receives and interprets information.

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Noise

Interference that degrades or distorts transmitted information.

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Analog Signal

A continuous signal that varies over time.

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Digital Signal

A signal that uses discrete values to represent information.

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Modulation

A process that makes the signal suitable for transmission by changing its characteristics.

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Multiplexing

A technique to transmit multiple signals over a single channel simultaneously.

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Electromagnetic Spectrum

Range of all possible frequencies of electromagnetic radiation.

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High Frequency (HF)

Radio waves with frequencies between 3 and 30 MHz.

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Very High Frequency (VHF)

Radio waves with frequencies between 30 and 300 MHz, used for FM radio and TV.

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Ultra High Frequency (UHF)

Radio waves with frequencies between 300 and 3000 MHz, used in TV and cellular.

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Microwaves

High-frequency radio waves used for satellite, radar and wireless applications.

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Infrared Radiation

Electromagnetic radiation with longer wavelengths than visible light.

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Visible Spectrum

Electromagnetic radiation that can be seen by the human eye.

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Optical Spectrum

The range of electromagnetic radiation encompassing infrared, visible and ultraviolet waves.

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Study Notes

Introduction to Electronic Communication

  • Communication is the process of exchanging information.
  • Main barriers are language and distance.
  • Contemporary society’s emphasis is now the accumulation, packaging, and exchange of information.
  • Methods of communication include:
    • Face to face
    • Signals
    • Written word (letters)
    • Electrical innovations:
      • Telegraph
      • Telephone
      • Radio
      • Television
      • Internet (computer)

Communication Systems

  • Components of a communication system:
    • Transmitter
    • Channel or medium
    • Receiver
  • Noise degrades or interferes with transmitted information.

Types of Electronic Communication

  • Many transmissions are of signals that originate in digital form but must be converted to analog form to match the transmission medium.
  • Digital data is transmitted over the telephone network.
  • Analog signals are first digitized with an analog-to-digital (A/D) converter.
  • The data can then be transmitted and processed by computers and other digital circuits.

Modulation and Multiplexing

  • Modulation and multiplexing are electronic techniques for transmitting information efficiently.
  • Modulation makes the information signal more compatible with the medium.
  • Multiplexing allows more than one signal to be transmitted concurrently over a single medium.

The Electromagnetic Spectrum

  • The electromagnetic spectrum encompasses all frequencies.

Electromagnetic Spectrum Frequencies

  • High Frequencies (HF) 3–30 MHz
    • short waves; VOA, BBC
    • broadcasts; government and
    • military two-way communication
    • amateur radio, CB
  • Very High Frequencies (VHF) 30–300 MHz
    • FM radio broadcasting (88–108 MHz)
    • television channels 2–13
  • Ultra High Frequencies (UHF) 300–3000 MHz
    • TV channels 14–67,
    • cellular phones
    • military communication
  • Microwaves and Super High 1–30 GHz
    • Frequencies (SHF)
    • Satellite communication
    • radar
    • wireless LANs
    • microwave ovens
  • Extremely High Frequencies (EHF) 30–300 GHz
    • Satellite communication
    • computer data
    • radar

Optical Spectrum

  • The optical spectrum exists directly above the millimeter wave region.
  • Three types of light waves are:
    • Infrared
    • Visible spectrum
    • Ultraviolet

Infrared Radiation

  • Infrared radiation is produced by any physical equipment that generates heat, including our bodies.
  • Infrared is used:
    • In astronomy, to detect stars and other physical bodies in the universe
    • For guidance in weapons systems where the heat radiated from airplanes or missiles can be detected and used to guide missiles to targets
    • In most new TV remote-control units, where special coded signals are transmitted by an infrared LED to the TV receiver to change channels, set the volume, and perform other functions
    • In some of the newer wireless LANs and all fiber-optic communication.

Visible Spectrum

  • The visible spectrum we refer to as light is just above the infrared region.

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Description

This quiz explores the fundamentals of electronic communication, focusing on the processes and systems involved in information exchange. It covers the types of communication methods, components of communication systems, and the conversion between digital and analog signals. Test your understanding of how modern technologies facilitate communication in contemporary society.

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