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Questions and Answers
In analog communications, what is the main method used to minimize noise error?
In analog communications, what is the main method used to minimize noise error?
What is a digital signal characterized by?
What is a digital signal characterized by?
Which type of signal can have an infinite number of values?
Which type of signal can have an infinite number of values?
What is the main challenge with additive noise in communication systems?
What is the main challenge with additive noise in communication systems?
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How is the quality of a transmitted signal typically measured in analog communications?
How is the quality of a transmitted signal typically measured in analog communications?
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What method is employed to minimize noise error in analog communications?
What method is employed to minimize noise error in analog communications?
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What kind of information processing do humans perform when dealing with analog signals?
What kind of information processing do humans perform when dealing with analog signals?
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Why did George Boole's Boolean Algebra not seem to have any practical use for many years?
Why did George Boole's Boolean Algebra not seem to have any practical use for many years?
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In what year did Claude Shannon complete a master thesis at MIT demonstrating the application of Boolean Algebra to telephony switching systems?
In what year did Claude Shannon complete a master thesis at MIT demonstrating the application of Boolean Algebra to telephony switching systems?
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What did Alan Turing propose in 1936 that demonstrated how complex problems can be solved?
What did Alan Turing propose in 1936 that demonstrated how complex problems can be solved?
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Which of the following is a benefit of digitization over analog systems?
Which of the following is a benefit of digitization over analog systems?
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What was Claude Shannon introduced to in a philosophy class at the University of Michigan that greatly influenced his work?
What was Claude Shannon introduced to in a philosophy class at the University of Michigan that greatly influenced his work?
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What is the main advantage of digital communications over analog communications?
What is the main advantage of digital communications over analog communications?
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What is the principle behind threshold detection in digital communications?
What is the principle behind threshold detection in digital communications?
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What is the purpose of averaging the received signal over one bit time in digital communications?
What is the purpose of averaging the received signal over one bit time in digital communications?
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Which of the following statements about Boolean algebra is true?
Which of the following statements about Boolean algebra is true?
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Who is considered the father of modern computer science and artificial intelligence?
Who is considered the father of modern computer science and artificial intelligence?
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What is the main contribution of Claude Shannon to the field of digital communications?
What is the main contribution of Claude Shannon to the field of digital communications?
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Study Notes
Digital Communications
- Digital information is a binary (0 or 1) signal that varies discretely in time.
- Noise added in transmission can be corrected by threshold detection and coding schemes.
Threshold Detection
- Received signal values larger than 0.5 can be considered as a "1".
- Received signal values smaller than 0.5 can be considered as a "0".
- Averaging the signal value over one bit time can improve accuracy.
Digital Telephony
- The core of the telephone network has been converted into a digital network since the 1970s.
- Digital telephony uses digital signals to transmit information, which are more reliable and less prone to distortion.
Analog Communications
- Analog signals are real-value signals that continuously vary in time.
- Distortion in transmission is very expensive to avoid and undo, and cannot be completely eliminated.
- Additive noise cannot be removed because it is random and unknown.
- Signal-to-noise ratio (SNR) is a measure of the quality of the signal transmitted.
Digital Signals and Systems
- Digital signals are quantities measured in discrete values at discrete time/space instances.
- True analog signals can have an infinite number of values.
- Finite systems must inherently be digital/discrete.
Digital Systems for Information Processing
- George Boole invented Boolean Algebra, which was later applied to simplify telephony switching systems.
- Claude Shannon demonstrated how Boolean Algebra could be applied to simplify switching systems.
- Alan Turing proposed the Turing Machine, which demonstrated how complex problems can be solved with a simple conceptual machine.
Benefits of Digitization
- Digital information can be exactly reproduced, stored, and moved from place to place.
- Analog signals cannot be easily duplicated, stored, or modified.
- Analog signals, once degraded, cannot be easily corrected.
- Analog systems are bulky and not easily modifiable to solve new or different tasks.
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Description
Test your knowledge on analog and digital signals. Explore the concept of continuous and discrete quantities and learn about Boolean Algebra introduced by George Boole.
