1. Video, Sound and printer
Chapter 4
Video, Sound and printer

2. Video and Sound
Monitors
Video Cards
Ergonomics and Monitors
Data Projectors
Sound Systems
Printer

3. 1. Monitors
Most common output device
Connects to the video port

4. 1. Monitors Monochrome - One color with black background
Grayscale Monitor- Varying degrees of gray
Color Monitor - Display 4 to 16 million colors

5. 1. Monitors
Cathode Ray Tube (CRT)
Liquid Crystal Display (LCD)
Plasma monitor
LED (light-emitting diodes)

6. 1. Monitors Plasma monitors
Use neon or xenon Gas is excited to produce light

7. 1. Monitors Size of monitor Measured in inches (2.54 cm/in)
Teaching tip
It is helpful to draw the relationship between viewable and actual size.

8. Better cards result in better output Have their own processor and RAM
2. Video Cards
Better cards result in better output
Have their own processor and RAM
Modern cards have up to 4 GB
Insider information
The two leading video card families are ATI’s Radeon and NVIDIA’s GeForce line. Both offer exceptional graphics cards ranging from $50 to $600.

9. 3. Ergonomics and Monitors
Eyestrain
Fatigue of the eyes
Steps to avoid
Choose a good monitor
Place the monitor 2 – 3 feet away
Center of screen below eye level
Avoid reflected light

10. Digital Light Projectors (DLP)
4. Data Projectors
LCD projectors
Most common type of projector
Require a darkened room
Digital Light Projectors (DLP)
Can be used in a lighted room
Insider information
A projector is rated in lumens. This is a measure of how bright the projector is. Higher lumens ratings result in a brighter projector. For a guide to lumens ratings, see

11. 5. Sound Systems
Sound card
Can be connected to several devices

12. 1. Commonly Used Printers
Impact printers
Non-impact printers
2. Comparing Printers
3. High-Quality Printers

13. 6. Commonly Used Printers
Impact printers
Generate output by striking the paper
Uses an inked ribbon
Non-impact printers
Use methods other than force
Tend to be quiet and fast

14. 6. Commonly Used Printers
Dot matrix printers
Impact printer
Used to print to multi-sheet pages
Speed measured in characters per second
Dot Matrix Print Head
Teaching Tip
Figure 4B.5 on page 163 provides an excellent rendering of how the print head works. Be sure to refer to the image as you teach.

15. 6. Commonly Used Printers
Ink-jet printers
Non-impact printer
Inexpensive home printer
Color output common using CMYK
Cyan(blue), magenta (red) , yellow, black
Speed measured in pages per minute (ppm)
Quality expressed as dots per inch (dpi)
Insider information
Nearly all of the electronics for the printer is kept in the ink cartridge. Thus, when the cartridge is replaced the printing components of the printer are replaced. Refilling cartridges is OK, but should not be reused more than 2-3 times.

16. Dots Per Inch

17. 6. Commonly Used Printers
Laser printer
Non-impact printer
Produces high quality documents
Color or black and white
Speed measured in pages per minute
Quality expressed as dots per inch (dpi)
Insider information
The laser printer works on a similar process to a photocopier. The first photocopier as we know it today was invented in Astoria NY in 1938 by Chester Carlson and Otto Kornei.

18. 6. Commonly Used Printers
All-in-one peripherals
Scanner, copier, printer and fax
Popular in home offices
Prices are very reasonable

19. 6. Comparing Printers
Determine what you need
Determine what you can spend
Initial cost
Cost of operating
Image quality
Speed

20. 6. High-Quality Printers
Photo printers
Produces film quality pictures
Prints very slowly
Prints a variety of sizes

21. 6. High-Quality Printers
Dye sublimation printers
Produces realistic output
Very high quality
Operation costs are high
Output is very slow

22. 6. High-Quality Printers
Plotters
Large high quality blueprints
Operational costs are low
Output is very slow

23. Thanks