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15 June 2008

IT_Chapter_3B

Devices for the Hand

Pen based input

Tablet PCs, PDA

Pen used to
write data

Pen used as
a pointer

Handwriting recognition

On screen keyboard

Touch screens

Sensors determine where finger points

Sensors create an X,Y coordinate

Usually presents a menu to users

Found in cramped or dirty environments

Game controllers

Enhances gaming experience

Provide custom input to the game

Modern controllers offer feedback

Joystick

Game pad

Optical Input Devices

Allows the computer to see input

Bar code readers

Converts bar codes to numbers

UPC code

Computer find number in a database

Works by reflecting light

Amount of reflected light indicates number

Image scanners

Converts printed media into electronic

Reflects light off of the image

Sensors read the intensity

Filters determine color depths

Optical character recognition (OCR)

Converts scanned text into editable text

Each letter is scanned

Letters are compared to known letters

Best match is entered into document

Rarely 100% accurate

Audiovisual Input Devices

Microphones

Used to record speech

Speech recognition

“Understands” human speech

Allows dictation or control of computer

Matches spoken sound to known phonemes

Enters best match into document

Musical Instrument Digital Interface

MIDI

Connects musical instruments to computer

Digital recording or playback of music

Musicians can produce professional results

Digital cameras

Captures images electronically

No film is needed

Image is stored as a JPG file

Memory cards store the images

Used in a variety of professions

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