1 Output Devices. 2 Output Output is data that has been processed into useful forms called...

Output

Devices

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

Graphics output

Defined as non-text pictorial information

Scanned Graphic Faxed documents are actually graphics, not words you can use in a word processor.

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

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

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.

Video Output can display different types of video from cameras, VCR's, video disks, CD's, HDTV, etc.

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

Color Display

Monochrome Monitors

One color, green or gray on black or gray

background

Flat Panel Displays

LCD or Liquid Crystal Display

Passive or Active Matrix.

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

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.

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

Printers

Impact Printers

Dot Matrix

Non-impact

InkjetLaser Thermal

Plotters

Special Purpose Printers

Dot Matrix Printer

Number of pins determine sharpness of letters (9pin or 24 pin)

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

Laser Printer

Laser printer speed is measured in PPM (pages per min.)

Resolution is measure in dpi (dots per inch)

Thermal Printers

High quality color but needs special paper

Color Plotter

Ink pens move over paper

Special Purpose Printers

Other Output Devices

LCD Projectors

Facsimile or FAX

Multifunction Device

Special Needs Devices

Multi-media classroom

The Future ???

1 Output Devices. 2 Output Output is data that has been processed into useful forms called...

Documents

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