digital analogue
TRANSCRIPT
![Page 1: Digital analogue](https://reader034.vdocument.in/reader034/viewer/2022052321/556165efd8b42a35458b510b/html5/thumbnails/1.jpg)
StarterWrite down 3 things you can remember about the
EM spectrum
![Page 2: Digital analogue](https://reader034.vdocument.in/reader034/viewer/2022052321/556165efd8b42a35458b510b/html5/thumbnails/2.jpg)
Learning Objectives
• Understand the difference between digital and analogue signals
• Explain the uses of the different parts of the EM spectrum
![Page 3: Digital analogue](https://reader034.vdocument.in/reader034/viewer/2022052321/556165efd8b42a35458b510b/html5/thumbnails/3.jpg)
Digital & Analogue Signals
![Page 4: Digital analogue](https://reader034.vdocument.in/reader034/viewer/2022052321/556165efd8b42a35458b510b/html5/thumbnails/4.jpg)
Analogue Signals• An analogue signal is a signal showing a
complete range of frequencies.• Is represented using a diagram of a
continuous wave.• Sound is an example of an analogue signal
![Page 5: Digital analogue](https://reader034.vdocument.in/reader034/viewer/2022052321/556165efd8b42a35458b510b/html5/thumbnails/5.jpg)
Digital Signals• Digital signals can only have 2 values: on or off• Are often represented using the numbers
0 & 1 (0 meaning ‘off’ and 1 meaning ‘on’)• a TV remote uses a
digital signal
![Page 6: Digital analogue](https://reader034.vdocument.in/reader034/viewer/2022052321/556165efd8b42a35458b510b/html5/thumbnails/6.jpg)
Digital signals are like a normal light switch
(on or off)
Analogue signals are like dimmer switches
(they can take any value)
![Page 7: Digital analogue](https://reader034.vdocument.in/reader034/viewer/2022052321/556165efd8b42a35458b510b/html5/thumbnails/7.jpg)
Interference
![Page 8: Digital analogue](https://reader034.vdocument.in/reader034/viewer/2022052321/556165efd8b42a35458b510b/html5/thumbnails/8.jpg)
We sometimes call this noise
![Page 9: Digital analogue](https://reader034.vdocument.in/reader034/viewer/2022052321/556165efd8b42a35458b510b/html5/thumbnails/9.jpg)
Quick Quiz
![Page 10: Digital analogue](https://reader034.vdocument.in/reader034/viewer/2022052321/556165efd8b42a35458b510b/html5/thumbnails/10.jpg)
1. Am I Digital or Analogue?
![Page 11: Digital analogue](https://reader034.vdocument.in/reader034/viewer/2022052321/556165efd8b42a35458b510b/html5/thumbnails/11.jpg)
2. Am I Digital or Analogue?
![Page 12: Digital analogue](https://reader034.vdocument.in/reader034/viewer/2022052321/556165efd8b42a35458b510b/html5/thumbnails/12.jpg)
3. Am I Digital or Analogue?
1, 1,0,0,1,1,1,1,1,1,1,0,1,0,
![Page 13: Digital analogue](https://reader034.vdocument.in/reader034/viewer/2022052321/556165efd8b42a35458b510b/html5/thumbnails/13.jpg)
4. Am I Digital or Analogue?
![Page 14: Digital analogue](https://reader034.vdocument.in/reader034/viewer/2022052321/556165efd8b42a35458b510b/html5/thumbnails/14.jpg)
5. Am I Digital or Analogue?
![Page 15: Digital analogue](https://reader034.vdocument.in/reader034/viewer/2022052321/556165efd8b42a35458b510b/html5/thumbnails/15.jpg)
6. Am I Digital or Analogue?
![Page 17: Digital analogue](https://reader034.vdocument.in/reader034/viewer/2022052321/556165efd8b42a35458b510b/html5/thumbnails/17.jpg)
8. Am I Digital or Analogue?
![Page 18: Digital analogue](https://reader034.vdocument.in/reader034/viewer/2022052321/556165efd8b42a35458b510b/html5/thumbnails/18.jpg)
The EM spectrum(Uses)
![Page 19: Digital analogue](https://reader034.vdocument.in/reader034/viewer/2022052321/556165efd8b42a35458b510b/html5/thumbnails/19.jpg)
Gamma rays
• Have the highest frequency• Have the shortest wavelength
Uses:• Sterilizing surgical equipment• Killing cancer cells
![Page 20: Digital analogue](https://reader034.vdocument.in/reader034/viewer/2022052321/556165efd8b42a35458b510b/html5/thumbnails/20.jpg)
X-rays
• Come after gamma rays in the EM spectrum
Uses:• Viewing internal parts of the body
![Page 21: Digital analogue](https://reader034.vdocument.in/reader034/viewer/2022052321/556165efd8b42a35458b510b/html5/thumbnails/21.jpg)
UV rays
• Are found between X-rays and visible light in the EM spectrum.
Uses:• Sunbeds.....but UV rays can cause skin cancer!!
![Page 22: Digital analogue](https://reader034.vdocument.in/reader034/viewer/2022052321/556165efd8b42a35458b510b/html5/thumbnails/22.jpg)
![Page 23: Digital analogue](https://reader034.vdocument.in/reader034/viewer/2022052321/556165efd8b42a35458b510b/html5/thumbnails/23.jpg)
Visible Light
• Found in the middle of the EM spectrum
Uses:• Photography• Human vision
![Page 24: Digital analogue](https://reader034.vdocument.in/reader034/viewer/2022052321/556165efd8b42a35458b510b/html5/thumbnails/24.jpg)
Infra-red rays
• Found on the opposite side of visible light as UV rays in the EM spectrum.
• Heat radiation
Uses:• Cooking• Remotes• Heat imaging
![Page 25: Digital analogue](https://reader034.vdocument.in/reader034/viewer/2022052321/556165efd8b42a35458b510b/html5/thumbnails/25.jpg)
Microwaves
• Found between IR waves and Radio waves in the EM spectrum.
Uses:• Cooking• Mobile phones
![Page 26: Digital analogue](https://reader034.vdocument.in/reader034/viewer/2022052321/556165efd8b42a35458b510b/html5/thumbnails/26.jpg)
Radio Waves
• Have the longest wavelength• Have the lowest frequency
Uses:• TV and radio signals