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Questions and Answers
What is the primary purpose of a transmitter in a communication system?
What is the primary purpose of a transmitter in a communication system?
- To receive and decode the electronic signal
- To amplify the electronic signal for better clarity
- To store messages for future use
- To convert messages into an electronic form suitable for transmission (correct)
Which of the following best describes the function of a communication channel?
Which of the following best describes the function of a communication channel?
- To serve as the medium for transmitting electronic signals from sender to receiver (correct)
- To convert physical signals into electronic signals
- To process and edit the received messages
- To store and retrieve information as needed
Which component is NOT typically involved in a communication system?
Which component is NOT typically involved in a communication system?
- Communication channel
- Transmitter
- Receiver
- Storage device (correct)
Which of the following is an example of an optical communication channel?
Which of the following is an example of an optical communication channel?
What type of communication system uses the atmosphere as its medium?
What type of communication system uses the atmosphere as its medium?
Which device would most likely be used to convert sound waves into an electronic audio signal?
Which device would most likely be used to convert sound waves into an electronic audio signal?
Who was responsible for the invention of the telephone?
Who was responsible for the invention of the telephone?
In a communication system, what converts physical characteristics like temperature into electronic signals?
In a communication system, what converts physical characteristics like temperature into electronic signals?
What significant event occurred in 1920?
What significant event occurred in 1920?
Which communication channel type is most often used for carrying long-distance calls and Internet communications?
Which communication channel type is most often used for carrying long-distance calls and Internet communications?
Which inventor is associated with the discovery of radio waves?
Which inventor is associated with the discovery of radio waves?
What was invented by Bell Laboratories in 1948?
What was invented by Bell Laboratories in 1948?
Which year marks the development and first use of the Internet?
Which year marks the development and first use of the Internet?
Who developed the first smartphones between 1996 and 2001?
Who developed the first smartphones between 1996 and 2001?
What innovation was introduced in 2007?
What innovation was introduced in 2007?
Which event started in 2019?
Which event started in 2019?
What is the primary function of amplifiers in a receiver?
What is the primary function of amplifiers in a receiver?
Which component in a receiver is responsible for combining different electronic signals?
Which component in a receiver is responsible for combining different electronic signals?
In the communication system block diagram, which component is responsible for transmitting the message?
In the communication system block diagram, which component is responsible for transmitting the message?
What does a tuned circuit primarily consist of?
What does a tuned circuit primarily consist of?
Which step comes immediately after the receiver in the communication process?
Which step comes immediately after the receiver in the communication process?
What is the role of filters in a receiver?
What is the role of filters in a receiver?
What fundamental technology underlies active sonars for underwater object detection?
What fundamental technology underlies active sonars for underwater object detection?
Which of these milestones in electronic communication occurred first?
Which of these milestones in electronic communication occurred first?
What defines simplex communication?
What defines simplex communication?
Which of the following is an example of simplex communication?
Which of the following is an example of simplex communication?
What is a characteristic of full duplex communication?
What is a characteristic of full duplex communication?
Which communication method allows for some communication but does not permit simultaneous send and receive?
Which communication method allows for some communication but does not permit simultaneous send and receive?
In which scenario does simplex downlink communication occur?
In which scenario does simplex downlink communication occur?
What is the role of the uplink in simplex communication?
What is the role of the uplink in simplex communication?
Which of the following statements accurately describes duplex communication?
Which of the following statements accurately describes duplex communication?
What type of communication is utilized in a telephone call?
What type of communication is utilized in a telephone call?
What does a short sine wave duration represent in continuous-wave signals?
What does a short sine wave duration represent in continuous-wave signals?
Which binary representation corresponds to the capital letter R in Morse code?
Which binary representation corresponds to the capital letter R in Morse code?
What is ASCII commonly used for?
What is ASCII commonly used for?
In the conversion of a letter to binary code, what do 0s represent?
In the conversion of a letter to binary code, what do 0s represent?
How are Morse code signals represented in continuous-wave (CW) code?
How are Morse code signals represented in continuous-wave (CW) code?
Which of the following statements is true regarding binary codes?
Which of the following statements is true regarding binary codes?
What does a long sine wave duration represent in continuous-wave signals?
What does a long sine wave duration represent in continuous-wave signals?
Which describes the representation of the letter V in binary code?
Which describes the representation of the letter V in binary code?
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Study Notes
Basics of Communication Systems
- Communication involves exchanging messages between senders and receivers, which can be verbal, nonverbal, print, or electronic.
- In electronics, a communication system comprises a transmitter, communication channel, and receiver.
- Information is often conveyed as an electronic signal.
Transmitter
- Converts messages into electronic forms for transmission.
- Examples include:
- Microphones turning sound into audio signals.
- Cameras converting light to video signals.
- Keyboards sending binary codes to computers.
- Transducers converting physical characteristics (temperature, pressure) into electronic signals.
Communication Channel
- The medium through which electronic signals travel.
- Types of channels include:
- Electrical Conductors: Materials (like metals) that allow electrical flow.
- Optical Media: Fiber-optic cables and light pipes that carry signals via light waves.
- Free Space: Used in wireless communication (radio).
- Water: Utilized in sonar systems for underwater communication.
Receiver
- Comprising electronic components that decode transmitted messages.
- Key components include:
- Amplifiers: Boost input signals.
- Oscillators: Generate continuous waveforms.
- Mixers: Combine multiple signals into fewer outputs.
- Tuned Circuits: Responsive to specific frequencies.
- Filters: Allow specific frequency amplification while reducing others.
Block Diagram of Communication Systems
- The process involves five blocks:
- Information Source, Transmitter, Channel, Receiver, Destination.
- Begins with the origin of the message and ends with processing at the destination.
History of Communication Systems
- Important milestones span from the telegraph's invention in 1837 to the rise of smartphones.
- Key events include:
- 1837: Telegraph invented by Samuel Morse.
- 1876: Telephone invented by Alexander Graham Bell.
- 1887: Radio waves discovered by Heinrich Hertz.
- 1901: First transatlantic radio contact by Guglielmo Marconi.
- 1920: First radio broadcast by KDKA in Pittsburgh.
- 2007: Development of Apple’s iPhone.
Categories of Electronic Communication
- Divided into one-way (simplex) and two-way (duplex) transmissions.
- Simplex Communication: One-way transmission where the receiver cannot respond (e.g., TV broadcast).
- Duplex Communication:
- Full Duplex: Simultaneous two-way communication, like a phone call.
- Half Duplex: Alternating two-way communication (e.g., walkie-talkies).
Continuous-Wave (CW) Code
- Represents dots and dashes using on/off sine wave signals.
- Used in Morse Code, where a short wave is a dot and a long wave is a dash.
Binary Codes and ASCII
- Binary codes encode numbers, letters, and symbols for digital communication.
- The American Standard Code for Information Interchange (ASCII) is widely utilized for representing text in computers.
Binary and ASCII Code Values
- Conversion from text to binary code involves mapping characters to defined binary values using ASCII.
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