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Questions and Answers
Who invented Frequency Modulation?
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?
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?
What was the first mobile telephone system introduced for public use?
- GSM
- MTS (correct)
- CDMA
- 3G
Who developed the first Monolithic Integrated Circuit Semiconductor chip?
Who developed the first Monolithic Integrated Circuit Semiconductor chip?
What does Sputnik I represent in satellite history?
What does Sputnik I represent in satellite history?
Which technology was significantly advanced by Edwin Armstrong's invention?
Which technology was significantly advanced by Edwin Armstrong's invention?
Which of the following statements is true regarding the Mobile Telephone System (MTS)?
Which of the following statements is true regarding the Mobile Telephone System (MTS)?
What distinguishes Sputnik I from the Moon as mentioned?
What distinguishes Sputnik I from the Moon as mentioned?
What method does fiber optics primarily use for transmission?
What method does fiber optics primarily use for transmission?
Who invented the first telephone?
Who invented the first telephone?
Which of the following inventions laid the groundwork for modern digital communications?
Which of the following inventions laid the groundwork for modern digital communications?
What innovation did John Ambrose Fleming contribute to electronics?
What innovation did John Ambrose Fleming contribute to electronics?
What is the primary function of an electronic communications system?
What is the primary function of an electronic communications system?
Which coding system does the telegraph utilize?
Which coding system does the telegraph utilize?
In what year was the first silicon integrated circuit produced?
In what year was the first silicon integrated circuit produced?
Who were the inventors of the transistor?
Who were the inventors of the transistor?
What is a transducer used for in electronic communication systems?
What is a transducer used for in electronic communication systems?
Which of the following is considered an analog form of information?
Which of the following is considered an analog form of information?
What type of channel is a coaxial cable classified as?
What type of channel is a coaxial cable classified as?
What is the primary function of a transmitter in electronic communication systems?
What is the primary function of a transmitter in electronic communication systems?
Which component would you NOT typically find in a transmitter?
Which component would you NOT typically find in a transmitter?
What distinguishes digital signals from analog signals?
What distinguishes digital signals from analog signals?
What is a primary characteristic of unguided communication channels?
What is a primary characteristic of unguided communication channels?
Which of the following best describes the role of filters in a transmitter?
Which of the following best describes the role of filters in a transmitter?
What is the primary function of a receiver in a communication system?
What is the primary function of a receiver in a communication system?
How is noise typically measured in a communication system?
How is noise typically measured in a communication system?
Which of the following describes a half duplex communication system?
Which of the following describes a half duplex communication system?
What is an example of simplex communication?
What is an example of simplex communication?
What are the components typically found in a receiver?
What are the components typically found in a receiver?
Which of the following best defines noise in a communication system?
Which of the following best defines noise in a communication system?
What do we refer to communication systems operating with both analog and digital signals?
What do we refer to communication systems operating with both analog and digital signals?
Which classification does NOT pertain to electronic communications?
Which classification does NOT pertain to electronic communications?
What defines a baseband signal?
What defines a baseband signal?
Which of the following statements is true regarding modulation?
Which of the following statements is true regarding modulation?
What is an example of a baseband signal in practical use?
What is an example of a baseband signal in practical use?
What is the primary purpose of modulation in signal transmission?
What is the primary purpose of modulation in signal transmission?
What type of signal is a lapel microphone considered to be?
What type of signal is a lapel microphone considered to be?
What characterizes a radio-frequency (RF) wave?
What characterizes a radio-frequency (RF) wave?
Which of the following is NOT typically true about baseband transmission?
Which of the following is NOT typically true about baseband transmission?
Why is modulation important in wireless communication?
Why is modulation important in wireless communication?
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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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