1 Output Devices. 2 Output Output is data that has been processed into useful forms called...
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Transcript of 1 Output Devices. 2 Output Output is data that has been processed into useful forms called...
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Output
Devices
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OutputOutput is data that has been processed into useful forms called information that can be used by a person or machine.
Types of Output are:
Reports
Graphics
Audio Output
Video Output
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Graphics output
Defined as non-text pictorial information
Scanned Graphic Faxed documents are actually graphics, not words you can use in a word processor.
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Scanning Text
You can scan a text
document but then you have
a picture of the text, not
text itself that can be
manipulated in a word processor
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A program, such as OmniPage will allow you to convert scanned documents into text you can use in a word processor. Check out their web site for many multi-media products. Click here
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Audio Output
Defined as sounds, including words and music, produced by the computer
Voice output can be of two types:
Encoded output is created by inputting sounds into the computer which turns the sounds into digits and stores them on disk. Later the sounds can be retrieved.
Voice synthesis programs can convert text from word processing documents into speech sounds.
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Video Output can display different types of video from cameras, VCR's, video disks, CD's, HDTV, etc.
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Display Devices are Monitors and Flat Panel Displays
Old name is CRT (cathode ray tube)
Come in different sizes
Some can display a full page of news text or be tilted
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Color Display
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Monochrome Monitors
One color, green or gray on black or gray
background
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Flat Panel Displays
LCD or Liquid Crystal Display
Passive or Active Matrix.
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Resolution
Images are displayed on the screen using patterns of lighted dots called pixels or picture elements.
A 640 X 480 resolution means that there are 640 dots across by 480 down.
VGA monitors have a resolution of 640X480
SVGA monitors have a resolution 1,024 X 768 or higher
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Dot pitch refers to how close the dots are to each other
Some high resolution displays are like photographs
The closer the dots are to each other, the sharper the image on the screen.
Lower dot pitch is better.
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Screen is coated with phosphorusShadow mask aligns beams of lightYoke moves the image across and down the screen
Older Non-interlaced monitors light every other line
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Printers
Impact Printers
Dot Matrix
Non-impact
InkjetLaser Thermal
Plotters
Special Purpose Printers
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Dot Matrix Printer
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Number of pins determine sharpness of letters (9pin or 24 pin)
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Non impact inkjet printers
Inkjet cartridges print documents by
spraying ink on the paper. Usually you
have a separate black cartridge because black is used more
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Laser Printer
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Laser printer speed is measured in PPM (pages per min.)
Resolution is measure in dpi (dots per inch)
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Thermal Printers
High quality color but needs special paper
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Color Plotter
Ink pens move over paper
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Special Purpose Printers
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Other Output Devices
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LCD Projectors
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Facsimile or FAX
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Multifunction Device
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Special Needs Devices
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Multi-media classroom
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The Future ???