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CCT101: Chapter 3
Input
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OBJECTIVES
Define the four types of input
Identify various types of keyboards
Describe different types of pointing devices
Describe different mouse types Explain how scanners and other reading devices work
Identify the purpose of a digital camera
Describe the various techniques used for audio and
video input
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WHAT IS INPUT?
Any data or instructions you enter into the
memory of a computer
Data - unorganized facts
Programs - series of instructions that tells the computerhow to perform a task
Commands - an instruction given to a computer
program
User responses - responses to questions or messages
from the software
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WHAT ARE INPUT DEVICES?
Any hardware component that allows you to enter
data, programs, commands, and user responses
into a computer
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THE KEYBOARD
Primary input device
Numeric keypad Status lights
Arrow keys - arrow control keys
Function keys
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THE KEYBOARD
Function keys often used in combination with
other keys
Insertion point
Toggle keys
Keys that can be switched between two different states
NUM LOCK key
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THE KEYBOARD
Keyboard Types
QWERTY
Might limit your typing speed
Dvorak
Designed to improve typing speed
Enhanced keyboards
Wireless keyboards
Transmit data via infrared light waves
Laptop and handheld keyboards Ergonomic keyboards
Incorporate comfort, efficiency and safety
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POINTING DEVICES
An input device that allows you to control a
pointer on the screen
Block arrow
I-beam
Pointing hand
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POINTING DEVICES (Mouse)
How a mouse works
Move the mouse across a flat surface The pointer on the screen also move
Move the mouse to an object such as a button
Press one of the mouse buttons to perform a certain
action
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POINTING DEVICES (Mouse)
Mouse types
Mechanical mouse
Has a rubber or metal ball on its underside to sense themouse movement
Optical mouse
Has no moving mechanical parts inside
Uses devices that emit and sense light to detect mousemovement
More precise than a mechanical mouse
Cordless or wireless mouse
Uses infrared or radio waves
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POINTING DEVICES
Trackball
Like a mouse, but the ball is on top
Rotate the ball mechanism with thumb, fingers or the palm
of your hand
Good alternative to a mouse if there is limited desk space
Touchpad
Flat, rectangular pointing device that is sensitive to
pressure and motion
Slide your fingertip across the surface of the pad Often used with laptop computers
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POINTING DEVICES
Pointing stick
Pressure sensitive pointing device shaped like a pencil
eraser Positioned between keys on the keyboard
Push the pointing stick with your finger
The pointer on the screen moves in the direction that
you push the pointing stick
Often used on laptop computers
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POINTING DEVICES
Joystick
Uses the movement of a vertical lever
Often used with games
Touch screen
Monitor has a touch-sensitive panel
Used to issue simple commands or choose from a list of
options
Kiosks Computerized information or reference center
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POINTING DEVICES
Pen input
Light pen
Contains light source or can detect light
Touch the pen against the surface of the screen or pointthe pen at the screen
Pen computing
Using electronic pen (stylus)
Use handwriting recognition software that translates the
letters and symbols
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POINTING DEVICES
Graphics tablet/ Digitizer/ Digitizing tablet
Consists of a flat, rectangular, electronic plastic boardused to input drawings, sketches or other graphical
data Each location on the tablet corresponds to a location
on the screen
When you draw on the table, the tablet detects andconverts the movements into digital signals
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SCANNERS AND READING
DEVICES
Make the input process more efficient by
eliminating the manual entry of data Source document
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Optical Scanner
Scanner
How a scanner works
Source document is scanned, a bright light moves across the
document
Image is reflected into a series of mirrors
Light image converted into an analog electronic current
Converted into a digital signal, sent to software in the computer
The scanned results are stored in rows and columns of dots,
called a bitmap
SCANNERS AND READING
DEVICES
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Optical Readers
Uses light to read characters, marks, and codes andthen converts them into digital data that can be
processed by a computer
SCANNERS AND READING
DEVICES
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Optical Readers
Optical character recognition (OCR)
Reads character printed in OCR font
Turn-around documents
Optical mark recognition (OMR)
Reads hand-drawn marks
Bar code scanner
Uses laser beams Universal Product Code (UPC)
SCANNERS AND READING
DEVICES
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Magnetic Ink Character Recognition (MICR)
Reader Used in banking industry
Preprinted on checks - bank code, account number,
and check number
SCANNERS AND READING
DEVICES
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Data collection devices
Used to obtain data directly at the location where the
transaction or event takes place
SCANNERS AND READING
DEVICES
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DIGITAL CAMERAS
Allows you to take pictures and store the
photographed images digitally Download, or transfer pictures to your computer
Edit, print, fax, mail, or post on the Web
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Speech Recognition/ Voice Recognition
Computers capability of distinguishing spoken words
Only recognize a vocabulary of certain words
Speaker dependent software
The computer makes a profile of your voice
You must speak each of the words in the vocabulary into
the computer repeatedly
AUDIO AND VIDEO INPUT
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AUDIO AND VIDEO INPUT
Speaker independent software
Has a built-in set of word patterns
Do not have to train a computer to recognize your voice
Discrete speech recognition Continuous speech recognition
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Video Input
Entering a full-motion recording into a computer andstoring the video on a hard disk or some other medium
Video capture card
Moving Picture Experts Group (MPEG)
AUDIO AND VIDEO INPUT
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Videoconferencing
Meeting between two or more geographically
separated individuals who use a network to transmit
audio and video data Microphone, Speaker, Video camera
Whiteboard
Window on the screen that displays notes and drawings
simultaneously
AUDIO AND VIDEO INPUT