Fundamentals of Electronic Communication Systems

Comprehensive vocabulary flashcards covering the fundamentals of electronic communication systems, applications, bandwidth, information theory, industry careers, information capacity, modulation, multiplexing, the electromagnetic spectrum, and electronic media.

The process of exchanging information from one location to another.

What is communication in electronic systems?

Input transducer.

During a phone call, which component converts a speaker's voice into an electrical signal prior to transmission?

Transducer.

Which device converts one form of energy into another form of energy?

Microphone.

What is a common example of an input transducer?

Converts an electrical signal into the original message.

What is the function of an output transducer?

To convert electrical signals into electromagnetic waves suitable for transmission.

What is the function of a transmitter?

The path over which information flows from source to destination.

What is a communication channel?

Guided and unguided media.

What are the two primary categories of communication channels?

It requires a very long antenna and can interfere with other signals.

Why is a baseband signal not suitable for long-distance communication?

The process of modifying a carrier wave according to the modulating signal.

What is modulation in fundamental communication systems?

The process of transmitting information.

What is communication as defined in applications surveys?

SMS/text messaging.

Which of the following is an example of mobile communication: GPS, SMS, satellite TV, or cloud computing?

Connect wirelessly to the Internet.

What does Wi-Fi allow devices to do?

Converts information into a signal.

What is the primary role of a transmitter in communication applications?

Communication channel.

What is the path where a communication signal travels called?

GPS (Global Positioning System).

Which technology is commonly used for navigation and determining location?

Signal interference or slower connection.

What is one problem caused by many devices sharing the same Wi-Fi network?

5G.

What technology is designed to provide higher data rates and lower latency?

Internet of Things.

What does the acronym IoT stand for?

Automatic language translation.

What is a prominent example of AI-assisted communication?

The range of frequencies a signal occupies or a channel can support.

What is bandwidth?

Hertz ($\text{Hz}$).

What unit is signal frequency measured in?

$$f = \frac{1}{T}$$

What is the mathematical formula for frequency in terms of period $T$?

Lower and upper cutoff frequency.

What are the two cutoff frequencies of a band-pass filter?

$-3\,\text{dB}$ point.

What is a filter's cutoff frequency also called in terms of decibels?

Narrower bandwidth.

What does a high Q-factor indicate about a filter's bandwidth?

Frequencies below its cutoff frequency.

What frequencies does a low-pass filter allow to pass?

Frequencies above its cutoff frequency.

What frequencies does a high-pass filter allow to pass?

Bits per second ($\text{bps}$).

What unit is standardly used to measure data transfer rate?

It can support a higher data-transfer rate.

What generally happens when a communication channel has greater bandwidth?

A mathematical framework for measuring, storing, compressing, and communicating information.

What is information theory?

Claude Shannon.

Who established the foundation of modern information theory in 1948?

Bit.

What is the basic unit of digital information?

The average uncertainty of a source.

What does entropy measure in information theory?

$$1\,\text{bit/symbol}$$

What is the calculated entropy of an equally likely binary source with probabilities of $0.5$ and $0.5$?

To reduce unnecessary redundancy and represent information with fewer bits.

What is the main purpose of source coding?

To detect or correct errors and improve communication reliability.

What is the main purpose of channel coding?

The maximum rate at which information can be transmitted reliably over a channel.

What does channel capacity represent?

Reliable communication is theoretically possible.

According to Shannon's noisy-channel theorem, what happens when the transmission rate is below channel capacity?

Mobile and wireless communication.

Which major field serves as a key practical application of information theory?

Organizations and professionals that create, transmit, manage, and deliver information.

What is the communication industry?

Telecommunications.

Which area includes mobile networks, fiber optics, the Internet, and telephone systems?

Designs, installs, tests, and maintains communication systems.

What does a telecommunications engineer primarily do?

Planning and maintaining computer and communication networks.

What is the main responsibility of a network engineer or administrator?

Technical systems used by radio and television stations.

What does a broadcast engineer maintain?

Public speaking.

Which skill is particularly important for a radio or TV broadcaster?

Researches, verifies, writes, records, and publishes information.

What does a journalist or digital content creator do?

Radio-frequency and wireless communication systems.

What systems does an RF/Wireless Communication Specialist work with?

To protect communication networks, devices, and information.

What is the main purpose of cybersecurity professionals in communication systems?

5G/6G and advanced wireless networks.

Which technology is expected to continue expanding global communication infrastructure?

The amount of information a system can store, process, or transmit.

What does information capacity refer to?

Greater bandwidth.

Which channel factor generally allows a communication medium to achieve a higher data rate?

More reliable signal transmission.

What does a higher signal-to-noise ratio (SNR) generally indicate?

$$C = 2B\log\_{2}(M)$$

Which formula calculates the maximum bit rate of an idealized noiseless channel?

$$8{,}000\,\text{bps}$$

A noiseless channel has a bandwidth of $2\,\text{kHz}$ and uses $4$ signal levels. What is its maximum Nyquist bit rate?

Shannon-Hartley theorem.

Which theorem is used to estimate the capacity of a noisy communication channel?

$$100$$

If the SNR is $20\,\text{dB}$, what is its equivalent linear value?

$$2{,}000\,\text{bps}$$

A channel has a bandwidth of $1{,}000\,\text{Hz}$ and a linear SNR of $3$. What is its channel capacity via Shannon's formula?

Nyquist uses signal levels, while Shannon considers noise and SNR.

What is the main conceptual difference between the Nyquist and Shannon capacity formulas?

Cellular communication.

Which widespread wireless system is a direct application of information capacity principles?

The process of changing a carrier signal to carry information.

What is modulation in signal transmission?

To allow information to travel over long distances.

Why is modulation needed in communication engineering?

Amplitude Modulation.

What does AM stand for?

Amplitude.

Which property of the carrier signal is altered in Amplitude Modulation (AM)?

Phase.

What carrier property does Phase Shift Keying (PSK) change to represent digital data?

Amplitude and phase.

Which two carrier properties are combined and modulated in QAM?

A technique that allows several signals to share one communication link.

What is multiplexing?

Multiplexer (MUX).

Which device combines multiple signals into a single transmission path?

Wavelength Division Multiplexing (WDM).

Which type of multiplexing uses different wavelengths of light in fiber-optic systems?

By assigned time slots.

How does Time Division Multiplexing (TDM) separate individual signals?

X-rays.

Which type of radiation has sufficient photon energy to ionize atoms?

The range of frequencies a channel can carry.

What does bandwidth measure in an electromagnetic spectrum context?

Optical fiber.

Which type of cable is used to transmit data using light?

$$v = f\lambda$$

What is the fundamental formula relating wave speed, frequency, and wavelength?

Radio waves.

Which of the following is an example of non-ionizing radiation: gamma rays, X-rays, or radio waves?

To transmit information wirelessly.

What is the primary role of the electromagnetic spectrum in communication systems?

A loss of signal power as light travels.

What does attenuation mean when referring to optical fiber?

Atmospheric conditions.

Which environmental factor can alter or degrade wireless signal propagation?

Infrared.

Which wavelength region of the electromagnetic spectrum is standardly used in optical fiber communication?

Radio frequencies.

Which frequency range is standardly allocated for radio communication?

Exchanging information using electronic devices and networks.

What is electronic communication?

Handwritten letter.

Which traditional correspondence medium is non-electronic: email, social media, SMS, or handwritten letter?

To carry the signal or information from sender to receiver.

What is the main operational purpose of a communication channel?

Email.

Which type of communication is commonly used for formal messages, official files, and records?

Quick, real-time text conversations.

What is instant messaging primarily used for?

Posts, comments, and direct messages.

What are primary methods of social media communication?

Sound through radio waves.

What does radio broadcasting primarily transmit?

Live face-to-face meetings over the Internet.

What is video conferencing?

Messages can arrive in seconds.

What is a major speed advantage of electronic communication?

Privacy and security risks.

What is a major operational risk and disadvantage of electronic communication?