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Lecture # 4

11/21/2012 Designed by Prof. Anosha Khan PGC 1

 Data or instructions entered into the computers are called
Input
 Input device is any hardware component that allows users to
enter data and issuing instructions (commands) to a computer


 Keyboards
 Pointing devices
 Scanners
 Image capture devices
 Audio capture


 Most common input
device. Ch#2 Page #
55
 Keyboard consists of
 Navigation keys
 Alphabetic keys
 Numeric keys
 Special purpose
keys
 Function keys
 Windows key

 Used to control the movement of Cursor/Pointer on
the screen and issuing commands.
 Mouse
 Track ball
 Touch pad
 Pointing Stick
 Touch Screen
 Light pen
 Joy Stick

 It is a Pointing device that fits under palm of
hand
 Mechanical
 Optical
 Cordless
or wireless


 Stationary pointing
device with a ball
on its top or side
 To move pointer,
rotate ball with
thumb, fingers, or
palm of hand


 Touchpad is small, flat, rectangular pointing
device sensitive to pressure and motion
 Move finger across surface of pad to move
cursor
 Tap the surface to select
 Used in Laptops


 Pointing stick is pointing device
shaped like pencil eraser
positioned between keys on
keyboard
 Move with fingers


 Touch areas of screen with
finger to give commands
 Special monitor
 Screen layer with
crisscrossed beams of
infrared light
 Select by touching screen
directly
 ATM machines use Touch
Screen

 Light Pen- Handheld input device that can detect light
 Press light pen against screen surface and then press
button on pen
 Digital Pen- Looks like a ballpoint pen, but uses
pressure to write text and draw lines
 Used with graphics tablets, flat electronic boards


 Explore Game
Controllers
 Read Lesson
2B , Page # 76


 The process of entering input by speaking
into a microphone
 Voice recognition is the computer’s capability
of distinguishing spoken words
 MIDI (musical instrument digital interface)
 External device, such as electronic piano
keyboard, to input music and sound effects


 Allows you to take
digital pictures
 Images viewable
immediately on
camera
 Download to
computer
 Post pictures
to Web
Page # 83

 Sharpness and clarity of image
 The higher the resolution, the better the image
quality, but the more expensive the camera
 Pixel (picture element)
is single point in
electronic image
 Greater the number of
pixels, the better the
image quality


 Process of entering full-motion
images into computer
 Video capture card is adapter card that
converts analog video signal into digital signal
that computer can use
 Digital video (DV) camera records video as
digital signals
 Lesson 2B , page#82


 Web cam is used to capture
video and still images, send
e-mail messages with video
attachments, add live
images to instant messages,
broadcast live images over
the Internet, and to make
video telephone calls on
Internet

 Two or more geographically
separated people who use network or
Internet to transmit audio and video
data
 Whiteboard is another window on
screen that can display notes and
drawings
simultaneously on
all participants’ screens


 Light-sensing device that
reads printed text and
graphics
 Used for image
processing, converting
paper documents into
electronic images


 Device that uses light source to read characters,
marks, and codes and then converts them into
digital data
 Optical character recognition (OCR) reads
characters in
OCR font
 Optical mark recognition (OMR) reads hand-
drawn pencil marks, such as small circles
 Bar Code Reader use laser beam to read bar
codes
Bar codes are verticals lines having
description about the product

 Can read text printed with magnetized ink
 Banking industry almost exclusively uses MICR for
check processing
Point of sale (POS) terminal
Records purchases, processes credit or debit cards, and
updates inventory
 Swipe credit or debit card through card reader or use your
fingerprint
 Reads customer’s personal data from magnetic strip


 Authenticates person’s identity by verifying personal
characteristic
 Finger print reader
 Voice verification
 Signature Verification
Home Task
Explore input devices for
Physically challenged persons


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