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Digital analogue

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Digital analogue

1. 1. Starter Write down 3 things you can remember about the EM spectrum
2. 2. Learning Objectives <ul><li>Understand the difference between digital and analogue signals </li></ul><ul><li>Explain the uses of the different parts of the EM spectrum </li></ul>
3. 3. Digital & Analogue Signals
4. 4. Analogue Signals <ul><li>An analogue signal is a signal showing a complete range of frequencies. </li></ul><ul><li>Is represented using a diagram of a continuous wave. </li></ul><ul><li>Sound is an example of an analogue signal </li></ul>
5. 5. Digital Signals <ul><li>Digital signals can only have 2 values: on or off </li></ul><ul><li>Are often represented using the numbers </li></ul><ul><li>0 & 1 (0 meaning ‘off’ and 1 meaning ‘on’) </li></ul><ul><li>a TV remote uses a </li></ul><ul><li>digital signal </li></ul>
6. 6. Digital signals are like a normal light switch (on or off) Analogue signals are like dimmer switches (they can take any value)
7. 7. Interference
8. 8. We sometimes call this noise
9. 9. Quick Quiz
10. 10. 1. Am I Digital or Analogue?
11. 11. 2. Am I Digital or Analogue?
12. 12. 3. Am I Digital or Analogue? 1, 1,0,0,1,1,1,1,1,1,1,0,1,0,
13. 13. 4. Am I Digital or Analogue?
14. 14. 5. Am I Digital or Analogue?
15. 15. 6. Am I Digital or Analogue?
16. 16. 7. Am I Digital or Analogue?
17. 17. 8. Am I Digital or Analogue?
18. 18. The EM spectrum (Uses)
19. 19. Gamma rays <ul><li>Have the highest frequency </li></ul><ul><li>Have the shortest wavelength </li></ul><ul><li>Uses: </li></ul><ul><li>Sterilizing surgical equipment </li></ul><ul><li>Killing cancer cells </li></ul>
20. 20. X-rays <ul><li>Come after gamma rays in the EM spectrum </li></ul><ul><li>Uses: </li></ul><ul><li>Viewing internal parts of the body </li></ul>
21. 21. UV rays <ul><li>Are found between X-rays and visible light in the EM spectrum. </li></ul><ul><li>Uses: </li></ul><ul><li>Sunbeds </li></ul><ul><li>.....but UV rays can cause skin cancer!! </li></ul>
22. 23. Visible Light <ul><li>Found in the middle of the EM spectrum </li></ul><ul><li>Uses: </li></ul><ul><li>Photography </li></ul><ul><li>Human vision </li></ul>
23. 24. Infra-red rays <ul><li>Found on the opposite side of visible light as UV rays in the EM spectrum. </li></ul><ul><li>Heat radiation </li></ul><ul><li>Uses: </li></ul><ul><li>Cooking </li></ul><ul><li>Remotes </li></ul><ul><li>Heat imaging </li></ul>
24. 25. Microwaves <ul><li>Found between IR waves and Radio waves in the EM spectrum. </li></ul><ul><li>Uses: </li></ul><ul><li>Cooking </li></ul><ul><li>Mobile phones </li></ul>
25. 26. Radio Waves <ul><li>Have the longest wavelength </li></ul><ul><li>Have the lowest frequency </li></ul><ul><li>Uses: </li></ul><ul><li>TV and radio signals </li></ul>