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

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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