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INPUT AND OUTPUT DEVICES.
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FUNDAMENTAL OF INFORMATION SYSTEM
Presentaion
INPUT AND OUTPUT DEVICES
PREPEARED AND PRESENTED BY
Raja Umair Arshed BBA III
WHAT IS INPUT?What is input?
Input device is any hardware component that allows users to enter data and instructions
Data or instructions entered into memory of computer
WHAT IS INPUT?What are the two types of input?
Unprocessed text, numbers, images, audio, and video
Instructions Programs Commands User responses
Data
KEYBOARD Similar to typewriter keyboard. Keys on keyboard consist up of letters, numbers,
symbols and function keys. Special keys like Tab, Del, Ctrl, PgUp, PgDn,etc. Easy to use and offers number of facilities. Can edit the input data very easily. Relatively inexpensive.
MOUSE A pointing device. Control and manipulate cursor movement on
monitor. Has three or four buttons on it and roller ball
which signals the movements on a flat surface. Move fast from one part of the screen to the
other.
Tiltwheel
Tiltwheel
Presswheelbutton
Presswheelbutton
Free-spin
wheel
Free-spin
wheel
Right-drag
Right-drag
Right-click
Right-click
Triple-click
Triple-click
Double-click
Double-click
POINTING DEVICESWhat are common mouse operations?
PointPoint
ClickClick
DragDrag
Rotate wheel
Rotate wheel
TOUCH SCREEN
A touch panel is transparent plate. Input is registered when a finger or any other
object comes in contact with the plate.
BAR CODE READER It reads bar coded data. Laser beam scanner is used to read the bar
code. Most commonly used bar code is the Universal
Product Code (UPC).
DIGITAL CAMERAS What is a digital camera?
Next
Allows you to take digital pictures
Images viewable immediately on camera Download to
computer Post pictures
to Web
TRACK BALL Also known as roller ball. Uses a hard sphere to control cursor movement. Ball can be rotated in any direction by hand. This digital signal in translated to control the
cursor movement on the screen.
SCANNER It is able to directly enter text and images
into the computer memory. Eliminated the duplication work of entering
data . This result into increase in speed of data
entry and accuracy.
VOICE RECOGNITION SYSTEM Uses microphone or telephone, a sound card
an special software. Voice recognition system are highly operator
dependent. Reduces the cost of data entry. Can move freely while talking into the
computer.
JOYSTICK Widely used in computer or video games. The direction and speed with which the joystick is
moved is converted into digital signal and sent to the computer system.
This in turn controls the movement of the cursor on the screen.
VOICE INPUT What is voice input? The process of entering input by speaking into
a microphone Voice recognition is the computer’s capability
of distinguishing spoken words
VIDEO INPUT What is a PC video camera and a
Web cam? PC video camera is used to capture video and still images, and to make video telephone calls on Internet Also called PC camera
Web camc—cvideo camera whose output displays on a Web page
WHAT IS OUTPUT?What is output? Data that has been processed into a useful form
Output device is any hardware component that can convey information to one or more people
DISPLAY DEVICESWhat is a display
device? Output device that visually conveys text, graphics, and video information Information on display device sometimes
called soft copy
Monitor houses display device that is packaged as separate peripheral
MONITORS Monitor is a device like television screen which is used to display information The resolution of monitors is the number of picture elements Monitors are of two types
Cathode Ray Tube Monitor (CRT) Flat Panel Display
PRINTER
It produces the output from the computer on the paper.
Produces a hard copy i.e. permanent copy of the result which can be stored and read later. Impact Printers Non-Impact Printers
PLOTTER
A plotter is a an output device used in applications where printouts of graphs and drawings are required
Plotters are of two types Flat Bed Plotter Drum Plotters
SPEAKERS, HEADPHONES, AND EARPHONESWhat is an audio output device? Computer component that produces music, speech, or
other sounds Speakers and headsets are common devices
COMPUTER MICROFILM OUTPUT (COM) This technology is used to record computer
output as a microscopic film images. Information is recorded on a roll of film. COM devices are used applications where
there are large volumes of data. They are much more faster than normal
printers Sophisticated & Expensive