Podcast
Questions and Answers
What is the main difference between analog and digital signals?
What is the main difference between analog and digital signals?
- Analog signals use Morse code while digital signals use ASCII.
- Analog signals are always represented by sine waves, whereas digital signals use square waves.
- Analog signals represent information using continuously varying voltage or current, while digital signals change in discrete increments. (correct)
- Analog signals have lower frequency than digital signals.
What is the unit used to measure the number of cycles of a repetitive wave occurring in a given time period?
What is the unit used to measure the number of cycles of a repetitive wave occurring in a given time period?
- Morse code
- Binary code
- Hertz (Hz) (correct)
- Wavelength
How is wavelength related to frequency?
How is wavelength related to frequency?
- There is no relationship between wavelength and frequency.
- Wavelength and frequency are inversely proportional. (correct)
- Wavelength and frequency are always equal.
- Wavelength and frequency are directly proportional.
What does modulation do to information signals?
What does modulation do to information signals?
What does baseband transmission involve?
What does baseband transmission involve?
What is the purpose of multiplexing in signal transmission?
What is the purpose of multiplexing in signal transmission?
What type of signals change in discrete increments and typically use binary codes?
What type of signals change in discrete increments and typically use binary codes?
Which unit is used to measure the number of cycles of a repetitive wave occurring in a given time period?
Which unit is used to measure the number of cycles of a repetitive wave occurring in a given time period?
What is the purpose of modulation in signal transmission?
What is the purpose of modulation in signal transmission?
What does wavelength represent in relation to a wave's cycles?
What does wavelength represent in relation to a wave's cycles?
What is the main difference between analog and digital signals with regard to their variation?
What is the main difference between analog and digital signals with regard to their variation?
What allows multiple signals to be transmitted simultaneously over a single medium?
What allows multiple signals to be transmitted simultaneously over a single medium?
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Study Notes
Signal Types
- Analog signals: continuously varying voltage or current signals, representing information like voice or video, e.g., sine waves.
- Digital signals: change in discrete increments, typically use binary codes, e.g., Morse code for telegraphy and ASCII for computer data.
Frequency and Wavelength
- Frequency: the number of cycles of a repetitive wave occurring in a given time period, measured in Hz (Hertz).
- One cycle per second is equal to one hertz (Hz).
- Wavelength: the distance between corresponding points of two consecutive cycles of a wave.
- Wavelength is inversely proportional to frequency.
Transmission Concepts
- Modulation: makes information signals compatible with transmission mediums.
- Multiplexing: allows multiple signals to be transmitted simultaneously over a single medium.
- Broadband transmission: the process of modulation, where the baseband signal modifies the carrier signal before transmission.
- Baseband transmission: converts intelligence signals (analog or digital) directly into electronic signals compatible with the medium.
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