specialized input devices other types of input devices include: scanners styluses microphones...
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Specialized Input Devices
Other types of input devices include:• Scanners
• Styluses
• Microphones
• Digital cameras
• Web cams
Scanner
•Scanner is a light sensitive device that helps you copy or capture images, photos, and artwork that exist on paper. Types of scanners include:Flatbed
Styluses
• Stylus is an input device consisting of a thin stick that uses pressure to enter information or to click and point
• Styluses are used with:PDAs Tablet PCsGraphics tablets
Microphones
• Microphones are used to input audio
• Three main types of microphones are:Desktop microphonesHeadsetsDirectional microphones
• Speech recognition is increasingly being included in application software
Digital Cameras
Digital cameras are used to: • Download images to a computer• Post pictures to the Web• Produce videos
Resolution is measured in megapixels
Higher the resolution, better the image quality, but the more expensive the camera
Web Cams
• Web cam is a video camera that can be used to take images for uploading to the Web
Barcode Reader
An input device that converts a pattern of printed bars into a number that a computer can read. They are often used by businesses to quickly input price and product information.
Output Devices
Output devices take information within your computer and present it to you in a form that you can understand
Main output devices: Monitors Printers Speakers
Printers
Inkjet Makes images by forcing
droplets through nozzles Top speed is 20 pages per
minute Laser
Forms images using an electrostatic process
Prints between 3 and 30 pages per minute
Printers - Cont
Resolution of a printer is the number of dots per inch (dpi) it produces.
Higher the resolution, better the image, and usually the more costly the printer
©2003 The McGraw-Hill Companies
3D Printing
In 3D printing, additive processes are used, in which successive layers of material are laid down under computer control.
A 3D printer is a type of industrial robot.
Printers - Cont.
Multifunction printer:
• Scan, copy, fax, and print
• Can be either inkjet or laser
• Cost less than buying individual units
• Take up less desk space
Speakers
A speaker is a device that produces computer output as sound
Speakers are common devices in computer systems Examples include:• Built-in speaker
• Two-device set speakers
• Surround sound speakers