Alternative Methods Of Input

Alternative Methods Of Input

• Devices for the Hand
• Optical Input Devices
• Audio-Visual (Multimedia) Input Devices

Alternative Input Devices – Devices for the Hand

• Pens

• Touch Screens

• Game Controlers

Devices for the Hand – Pens

•With a pen-based system, you use an electronic pen
to write on the screen and choose commands.

•Pens are common input devices for handheld
computers, like “personal digital assistants (PDAs).”

•Pens are handy for making notes or selecting
commands, not for inputing a lot of text.

Devices for the Hand – Touch Screens

• Touch-screen systemsaccept input directly through
the monitor.

• Touch screens use sensors to detect the touch of a
finger. They are useful where environmental
conditionsprohibit the use of a keyboard or mouse.

• Touch-screen systems are useful for selecting options
from menus.

Devices for the Hand – Game Controlers

• The two primary types of game controlers are
joysticks and game pads.

• Game pads usualy provide controls for each hand.

• Joysticks are popular for flight simulator and
driving games.

Alternative Input Devices –Optical Input Devices

•Bar Code Readers

•Image Scanners and OCR

Optical Input Devices – Bar Code Readers

•Bar code readers can read bar codes—paterns of
printed bars.

•The reader emits light, which reflects of the bar code
and into a detector in the reader. The detector
translates the code into numbers.

•Flatbed bar code readers are commonly found in
supermarkets. Courier services often use handheld

Optical Input Devices –Image Scanners and OCR

•Image scanners digitize printed images for storage and
manipulation in a computer.

•A scanner shines light onto the image and interprets
the reflection.

•Optical character recognition (OCR) software
translates scanned text into editable electronic

Alternative Input Devices –Audio-Visual (Multimedia) Input Devices

•Microphones and Speech Recognition

•Video Input

Audio-Visual (Multimedia) Input Devices -Microphones and Speech Recognition

•Microphones can accept auditory input. A
microphone requires a sound card in the PC.

•A sound card can digitize analog sound signals, and
convert digital sound signals to analog form.

•With speech recognition software, you can use your
microphone to dictate text, navigate programs, and
choose commands.

Audio-Visual (Multimedia) Input Devices –Video Input

•PC video cameras digitize ful-motion images.

•Digital cameras capture stil images.

•These cameras breakimages into pixels and store
data about each pixel.

•Video images may be compressed to use less memory
and storage space.



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