Electronic Communication Overview

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Questions and Answers

Which type of electronic communication allows for simultaneous talking and listening?

Half Duplex

Simplex

Full Duplex (correct)

Analog

What is an example of simplex communication?

Two-way radio

Telephone

Family radio

Radio (correct)

Which statement best describes half duplex communication?

One party transmits while the other listens.

Both parties can talk simultaneously.

It only transmits analog signals.

It is a two-way communication method. (correct)

What is a characteristic of analog signals?

Smooth and continuous variations Signup and view all the answers

Which of the following is NOT an example of half duplex communication?

Telephone Signup and view all the answers

What is the primary difference between analog and digital signals?

Digital signals use binary or two-state codes. Signup and view all the answers

Which method of communication involves only one party transmitting at a time?

Half Duplex Signup and view all the answers

Which of the following is an example of digital signals?

Binary code Signup and view all the answers

What defines electronic communication?

Transfer of signs, signals, writing, and data using electronic means. Signup and view all the answers

Which is NOT an example of electronic communication?

Face-to-face conversation Signup and view all the answers

What are the basic components of a communication system?

Transmitter, channel, receiver. Signup and view all the answers

Which component converts the electrical signal into a suitable transmission signal?

Transmitter Signup and view all the answers

What factor can degrade or interfere with transmitted information?

Noise Signup and view all the answers

Which method of communication involves the use of electronic innovations?

Television broadcasts Signup and view all the answers

Which of the following is a function of the transmitter in a communication system?

To filter and modulate the signal for transmission. Signup and view all the answers

Which of the following is a characteristic of electronic communication?

It can include images and sounds. Signup and view all the answers

Which technique allows for the simultaneous transmission of multiple signals over a single medium?

Multiplexing Signup and view all the answers

What is the primary purpose of modulation in electronic communication?

To make the information signal compatible with the transmission medium Signup and view all the answers

In baseband transmission, how is information typically sent?

Directly and unmodified over the medium Signup and view all the answers

Which type of code is primarily used in computer communications?

Serial binary code Signup and view all the answers

What does analog-to-digital conversion primarily enable?

Processing of digital data by computers Signup and view all the answers

Which of the following describes broadband transmission?

It requires a carrier signal that is modulated with audio, video, or data. Signup and view all the answers

What does the term 'baseband information' refer to?

Information sent directly without modulation Signup and view all the answers

Which characteristic best describes a carrier signal in broadband transmission?

It modulates data signals for transmission. Signup and view all the answers

What is the unit of frequency?

Hertz (Hz) Signup and view all the answers

What symbol is used to represent wavelength?

λ Signup and view all the answers

How is wavelength calculated using frequency?

Wavelength = speed of light ÷ frequency Signup and view all the answers

Which of the following frequency ranges corresponds to Extremely Low Frequencies (ELF)?

30–300 Hz Signup and view all the answers

What frequency corresponds to the higher end of the human hearing range?

20 kHz Signup and view all the answers

If the frequency of a signal is 4 MHz, what is the corresponding wavelength?

75 meters Signup and view all the answers

Which frequency range includes AM radio?

Medium Frequencies (MF) Signup and view all the answers

What does a cycle of a wave consist of?

Two voltage polarity reversals Signup and view all the answers

What is the primary purpose of modulation in broadband transmission?

To prepare a carrier signal for transmission Signup and view all the answers

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

Waveform Modulation Signup and view all the answers

What does frequency-shift keying (FSK) primarily do?

Changes signals into frequency-varying tones Signup and view all the answers

Which type of multiplexing involves sharing a medium by dividing different frequencies?

Frequency division multiplexing Signup and view all the answers

What is the role of modems in signal transmission?

To translate between digital and analog formats Signup and view all the answers

Which process is performed at the receiver to retrieve the original signal?

Demodulation Signup and view all the answers

What is the definition of multiplexing in telecommunications?

The process of allowing multiple signals to share the same channel Signup and view all the answers

Which of the following types of signals is NOT part of the electromagnetic spectrum?

Sound waves Signup and view all the answers

Study Notes

Electronictromagnetic, photoelectronic or photooptical system that affects interstate or foreign commerce.
Examples include email, instant messaging, websites, blogs, text messaging, voicemail, and video messaging.
Electronic communication has changed the way businesses communicate with each other.

Communication

Electronic communication is any transfer of signs, signals, writing, images, sounds, data, or information transmitted by wire, radio, elec

Electronic communication can be very beneficial if used effectively.

Methods of Communication

Face to face communication is direct interaction between two or more people.
Signals are used to transmit information by means of predetermined meanings.
Written word refers to communicating by letters, memos, or other written documents.
Electrical innovations have revolutionized communication methods:
- The Telegraph allowed for long-distance communication using electrical signals along wires.
- The telephone enabled voice communication over distances via electrical signals.
- Radio uses electromagnetic waves to transmit audio signals over long distances.
- Television broadcasts video and audio signals using electromagnetic waves.
- The internet is a global network of interconnected computers that facilitates communication and information sharing.

Communication Systems

Basic components of a communication system:
- Transmitter converts information into a transmittable signal.
- Channel or medium carries the signal from the transmitter to the receiver.
- Receiver converts the received signal back to the original information.
Noise degrades or interferes with transmitted information.

Types of Electronic Communication

Simplex communication allows for one-way transmission, like radio broadcasts, TV broadcasts, and beepers.
Full Duplex communication is two-way and allows simultaneous transmission and reception, such as telephone calls.
Half Duplex communication is two-way but only allows one party to transmit at a time, like police radios, CB radios, and amateur radios.

Analog Signals

Analog signals are continuously varying signals that represent information as a smooth wave.
They are used in voice and video communication, including television signals.

Digital Signals

Digital signals are discrete signals that represent information using a limited set of values, often binary (0s and 1s).
Examples include telegraph signals, Morse code, and serial binary code.
Digital data can be transmitted over analog networks, such as telephone lines, by converting the data to analog signals (using an analog-to-digital converter) and then converting it back to digital data at the receiver.

Modulation and Multiplexing

Modulation is the process of changing a signal's characteristics to make it suitable for transmission over a specific medium.
Multiplexing allows multiple signals to share the same transmission medium, increasing efficiency.

Baseband Transmission

Baseband information is transmitted directly over the medium without modulation or is used to modulate a carrier for transmission.
This is used in telephone systems and some computer networks.

Broadband Transmission

Broadband transmission involves modulating a high-frequency carrier signal with the information signal and transmitting it through space using electromagnetic waves.
Amplitude modulation (AM) and Frequency modulation (FM) are common methods of modulation.
Phase modulation (PM) is another method where the phase angle of the carrier wave is varied.
Frequency-shift keying (FSK) converts data into frequency-varying tones.
Modems (modulator-demodulator) translate digital data to analog signals and vice versa.
Demodulation extracts the original information signal from the modulated carrier wave in the receiver.

Multiplexing

Frequency division multiplexing (FDM) assigns different frequency bands for each signal.
Time division multiplexing (TDM) assigns different time slots for each signal.
Code division multiplexing (CDM) uses unique codes to separate signals within the same time slot.

Electromagnetic Spectrum

The electromagnetic spectrum encompasses all frequencies of electromagnetic waves.
Radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays are parts of the electromagnetic spectrum.

Frequency and Wavelength

Frequency is the number of cycles of a wave per second, measured in Hertz (Hz).
Wavelength is the distance between two consecutive peaks or troughs of a wave, measured in meters (m).
Wavelength is inversely proportional to frequency.
The speed of light is constant, approximately 3 × 10⁸ meters per second (m/s).
The relationship between frequency (f) and wavelength (λ) is given by:
- λ = speed of light / f
- Example: If the frequency is 4 MHz, the wavelength is 75 meters.

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Description

This quiz explores the different methods of electronic communication, such as email, instant messaging, and video messaging. It also covers traditional communication methods like face-to-face interaction and written communication. Understand how these methods have transformed business interactions and overall communication practices.