Invention of Frequency Modulation

Questions and Answers

Who invented Frequency Modulation?

Jack Kilby

Arthur C. Clarke

K.C. Kao

Edwin Armstrong (correct)

Which satellite was proposed by Arthur C. Clarke for long distance radio transmissions?

Voyager 1

Apollo 11

Sputnik I (correct)

Hubble Space Telescope

What was the first mobile telephone system introduced for public use?

GSM

MTS (correct)

CDMA

Who developed the first Monolithic Integrated Circuit Semiconductor chip?

Jack Kilby Signup and view all the answers

What does Sputnik I represent in satellite history?

First active satellite Signup and view all the answers

Which technology was significantly advanced by Edwin Armstrong's invention?

Long distance radio signals Signup and view all the answers

Which of the following statements is true regarding the Mobile Telephone System (MTS)?

It was the first mobile telephone system available to the public. Signup and view all the answers

What distinguishes Sputnik I from the Moon as mentioned?

Sputnik I was powered and the Moon was not. Signup and view all the answers

What method does fiber optics primarily use for transmission?

Light Signup and view all the answers

Who invented the first telephone?

Alexander Graham Bell Signup and view all the answers

Which of the following inventions laid the groundwork for modern digital communications?

Telegraph Signup and view all the answers

What innovation did John Ambrose Fleming contribute to electronics?

Vacuum-tube diode Signup and view all the answers

What is the primary function of an electronic communications system?

To transfer information from one place to another Signup and view all the answers

Which coding system does the telegraph utilize?

Morse code Signup and view all the answers

In what year was the first silicon integrated circuit produced?

1958 Signup and view all the answers

Who were the inventors of the transistor?

John Bardeen, William Shockley, Walter H. Brattain Signup and view all the answers

What is a transducer used for in electronic communication systems?

To convert physical characteristics into electrical signals Signup and view all the answers

Which of the following is considered an analog form of information?

Human voice Signup and view all the answers

What type of channel is a coaxial cable classified as?

Guided channel Signup and view all the answers

What is the primary function of a transmitter in electronic communication systems?

To convert electrical signals into a suitable form for transmission Signup and view all the answers

Which component would you NOT typically find in a transmitter?

Transducer Signup and view all the answers

What distinguishes digital signals from analog signals?

Digital signals change in discrete steps, while analog signals change continuously. Signup and view all the answers

What is a primary characteristic of unguided communication channels?

They transmit signals through free space. Signup and view all the answers

Which of the following best describes the role of filters in a transmitter?

To eliminate unwanted frequency components Signup and view all the answers

What is the primary function of a receiver in a communication system?

To convert received signals back to a human-understandable form Signup and view all the answers

How is noise typically measured in a communication system?

By dividing signal power by noise power to find the signal-to-noise ratio (SNR) Signup and view all the answers

Which of the following describes a half duplex communication system?

Communication where one party can transmit while the other party waits Signup and view all the answers

What is an example of simplex communication?

AM and FM radio broadcasting Signup and view all the answers

What are the components typically found in a receiver?

Amplifiers, oscillators, mixers, filters, and demodulators Signup and view all the answers

Which of the following best defines noise in a communication system?

Unwanted signals that disturb the quality of the received signal Signup and view all the answers

What do we refer to communication systems operating with both analog and digital signals?

Mixed-mode systems Signup and view all the answers

Which classification does NOT pertain to electronic communications?

Hot or cold communications Signup and view all the answers

What defines a baseband signal?

A signal that can be either analog or digital Signup and view all the answers

Which of the following statements is true regarding modulation?

It allows baseband signals to be transmitted via radio waves Signup and view all the answers

What is an example of a baseband signal in practical use?

Voice transmission in a telephone system Signup and view all the answers

What is the primary purpose of modulation in signal transmission?

To enable long-distance transmission of signals Signup and view all the answers

What type of signal is a lapel microphone considered to be?

Baseband signal Signup and view all the answers

What characterizes a radio-frequency (RF) wave?

It is capable of carrying baseband signals over long distances Signup and view all the answers

Which of the following is NOT typically true about baseband transmission?

It requires modulation to transmit over wires Signup and view all the answers

Why is modulation important in wireless communication?

It allows the use of higher frequencies to transmit signals efficiently Signup and view all the answers

Study Notes

Inventions and Innovations in Communication

Edwin Armstrong invented Frequency Modulation (FM), enhancing signal quality.
Arthur C. Clarke proposed satellite technology for long-distance radio transmission; Sputnik I was the first active satellite.
AT&T launched the first public mobile telephone system, Mobile Telephone System (MTS).
Jack Kilby created the first Monolithic Integrated Circuit semiconductor chip with both active and passive components.
K.C. Kao and G.A. Bockham introduced the concept of using cladded fiber optic cables for data transmission.

Development of Electronic Communication

Samuel Morse invented the telegraph in 1844, utilizing Morse code, which is a variable-length code comprising four symbols.
Alexander Graham Bell developed the first telephone in 1875, enabling real-time speech transmission through electrical encoding.
John Ambrose Fleming invented the vacuum-tube diode in 1904, followed by Lee de Forest's vacuum-tube triode in 1906.
The transistor was introduced in 1948 by Brattain, Bardeen, and Shockley, marking a pivotal advance in electronics.
Robert Noyce produced the first silicon integrated circuit in 1958.

Electronic Communication Systems

Electronic communication systems aim to transfer information through transmitters, channels, and receivers.
Transmitters convert messages into electronic signals suitable for transmission, using components like oscillators and amplifiers.
Communication channels can be guided (e.g., wires, fiber optics) or unguided (e.g., free-space radio waves).
Receivers convert transmitted messages back into understandable forms, recovering the original signals through amplification and demodulation.

Types of Signals

Information can be analog (continuously changing) or digital (discrete values).
Analog signals represent continuously varying voltages or currents, while digital signals represent data in binary form.

Noise and Signal Quality

Noise refers to unwanted signals disrupting communication quality, with measurement expressed as Signal-to-Noise Ratio (SNR).

Classification of Electronic Communication

Electronic communications can be classified based on transmission type (simplex or duplex) and the nature of signals (analog or digital).
Simplex communication is one-way (e.g., radio broadcasting), while duplex communication allows two-way interaction.

Modulation and Multiplexing

Modulation is necessary for transmitting baseband signals over wireless channels.
Baseband transmissions can occur directly or through modulating a carrier signal for efficient long-distance communication.

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Description

This quiz explores the contributions of Edwin Armstrong, who invented Frequency Modulation. Discover how this significant invention improved the quality of signal transmission and its impact on communication technology.