Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Question 2. Select the correct statement regarding the modulated ASK waveform.
a. There is no difference between the OOK and ASK waves
b. It is seen that logical “1s” and “0s” are represented by different carrier wave amplitudes
c. Unlike OOK where logical data is represented by a voltage or the absence of a voltage, ASK represents logical
data using different voltage levels operating at the same frequency
d. both b and c are correct statements
2. **Carrier Wave**
The second graph demonstrates the "Carrier Wave," a continuous wave usually generated by a sinusoidal oscillator. In this figure, you can observe a repeating sine wave oscillating between +5 and -5 units of amplitude over time.
3. **OOK Modulated Signal**
The third graph presents the "OOK Modulated Signal." This signal shows how the Carrier Wave is modulated by the Simple Line Coded Data. When the line-coded data is high (representing a digital `1`), the Carrier Wave is transmitted. Conversely, when the line-coded data is low (representing a digital `0`), the Carrier Wave is turned off (amplitude is zero).
4. **Combined Line Coded Data and OOK Modulated Carrier**
The fourth graph combines both the Simple Line Coded Data and the resulting OOK Modulated Carrier. This plot provides a clear representation of how the modulated carrier aligns with the original digital data over time.
**Conclusion**
These graphics provide a step-by-step visual understanding of On-Off Keying (OOK) modulation, demonstrating how digital data is encoded onto a carrier wave for transmission. By turning the carrier wave on or off, the digital information is effectively communicated, which is fundamental in various communication systems, including radio and optical transmissions.](https://content.bartleby.com/qna-images/question/28cf2a53-a49c-45f9-b820-a09b5f1a5e62/9a6217b2-3f16-49a9-893e-6e16c412013d/ho1ez2i_processed.png)
Transcribed Image Text:**Educational Website Content: Understanding On-Off Keying (OOK) Modulation**
**Introduction to On-Off Keying (OOK) Modulation**
On-Off Keying (OOK) is a form of amplitude-shift keying (ASK) modulation that represents digital data as the presence or absence of a carrier wave. In this section, we will explore how OOK modulation works, using graphical representations to demonstrate the process.
**Graphical Explanation of OOK Modulation**
1. **Simple Line Coded Data**
The first graph depicts "Simple Line Coded Data." On the y-axis, the amplitude values are shown, while the x-axis represents time. It displays a binary signal with levels switching between high and low, corresponding to digital `1`s and `0`s.
2. **Carrier Wave**
The second graph demonstrates the "Carrier Wave," a continuous wave usually generated by a sinusoidal oscillator. In this figure, you can observe a repeating sine wave oscillating between +5 and -5 units of amplitude over time.
3. **OOK Modulated Signal**
The third graph presents the "OOK Modulated Signal." This signal shows how the Carrier Wave is modulated by the Simple Line Coded Data. When the line-coded data is high (representing a digital `1`), the Carrier Wave is transmitted. Conversely, when the line-coded data is low (representing a digital `0`), the Carrier Wave is turned off (amplitude is zero).
4. **Combined Line Coded Data and OOK Modulated Carrier**
The fourth graph combines both the Simple Line Coded Data and the resulting OOK Modulated Carrier. This plot provides a clear representation of how the modulated carrier aligns with the original digital data over time.
**Conclusion**
These graphics provide a step-by-step visual understanding of On-Off Keying (OOK) modulation, demonstrating how digital data is encoded onto a carrier wave for transmission. By turning the carrier wave on or off, the digital information is effectively communicated, which is fundamental in various communication systems, including radio and optical transmissions.
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