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Questions and Answers
Which of the following is NOT a method of communication mentioned?
Which of the following is NOT a method of communication mentioned?
Noise has no impact on transmitted information.
Noise has no impact on transmitted information.
False
What are the three basic components of a communication system?
What are the three basic components of a communication system?
Transmitter, channel (or medium), receiver
The main barriers to communication are language and __________.
The main barriers to communication are language and __________.
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Match the type of communication with its example:
Match the type of communication with its example:
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Which application is included in the survey of communication applications?
Which application is included in the survey of communication applications?
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Contemporary society emphasizes the exchange of information more than accumulation.
Contemporary society emphasizes the exchange of information more than accumulation.
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What is the significance of human communication?
What is the significance of human communication?
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Which of the following is an example of a digital signal?
Which of the following is an example of a digital signal?
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Digital signals must always remain in digital form during transmission.
Digital signals must always remain in digital form during transmission.
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What device is used to convert analog signals to digital form?
What device is used to convert analog signals to digital form?
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In ________ transmission, information can be sent directly and unmodified over the medium.
In ________ transmission, information can be sent directly and unmodified over the medium.
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Match each type of transmission with its characteristics:
Match each type of transmission with its characteristics:
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What is the purpose of modulation in electronic communication?
What is the purpose of modulation in electronic communication?
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Broadband transmission relies on modulating a high-frequency carrier signal.
Broadband transmission relies on modulating a high-frequency carrier signal.
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What type of waves are radio-frequency (RF) waves?
What type of waves are radio-frequency (RF) waves?
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What is the main function of a transmitter?
What is the main function of a transmitter?
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A receiver is responsible for sending the message across the communication channel.
A receiver is responsible for sending the message across the communication channel.
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Name one example of a transceiver.
Name one example of a transceiver.
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Noise in a communication system refers to __________ electronic energy that interferes with the transmitted message.
Noise in a communication system refers to __________ electronic energy that interferes with the transmitted message.
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Match the following components with their functions:
Match the following components with their functions:
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Which of the following is NOT a type of communication channel medium?
Which of the following is NOT a type of communication channel medium?
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Attenuation of a signal is inversely proportional to the distance between the transmitter and receiver.
Attenuation of a signal is inversely proportional to the distance between the transmitter and receiver.
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What electronic components do receivers contain?
What electronic components do receivers contain?
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Which frequency range corresponds to Very High Frequencies (VHF)?
Which frequency range corresponds to Very High Frequencies (VHF)?
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The optical spectrum includes infrared, visible, and radio waves.
The optical spectrum includes infrared, visible, and radio waves.
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What is one application of infrared radiation?
What is one application of infrared radiation?
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FM radio broadcasting operates in the _____ frequency range.
FM radio broadcasting operates in the _____ frequency range.
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Which of the following is a usage of Extremely High Frequencies (EHF)?
Which of the following is a usage of Extremely High Frequencies (EHF)?
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Match the frequency bands with their respective applications:
Match the frequency bands with their respective applications:
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What are the three types of light waves in the optical spectrum?
What are the three types of light waves in the optical spectrum?
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Infrared radiation is only used in remote control devices.
Infrared radiation is only used in remote control devices.
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Which of the following is NOT a common method of modulation?
Which of the following is NOT a common method of modulation?
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Phase modulation varies the frequency of the carrier signal.
Phase modulation varies the frequency of the carrier signal.
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What process allows two or more signals to share the same channel?
What process allows two or more signals to share the same channel?
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The modulation and demodulation of signals are performed by a ______.
The modulation and demodulation of signals are performed by a ______.
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Match the types of multiplexing with their descriptions:
Match the types of multiplexing with their descriptions:
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What does Frequency-shift keying (FSK) convert data into?
What does Frequency-shift keying (FSK) convert data into?
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Demodulation occurs at the transmitter when the original signal is extracted.
Demodulation occurs at the transmitter when the original signal is extracted.
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What is the range of electromagnetic signals encompassing all frequencies called?
What is the range of electromagnetic signals encompassing all frequencies called?
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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.
