2 Ch 4 Processor Control Unit Arithmetic Logic Unit (ALU) Input
Devices Ch 5 Storage Devices Ch 7 Output Devices Ch 6 Memory
DataInstructions Information Instructions Data Information Control
Unit Ch 1 Introduction Ch 2 Internet & WWW Ch 3 Application
Software Ch 8 System Software
Slide 3
3 Software Instructions that tell hardware what tasks to do and
how to perform tasks Hardware Electronic and mechanical equipment
Input devices are parts of hardware
Slide 4
Input 4 Input what? Data Text Numbers Audio Images Videos Bio
information Movements Instructions Programs Commands User responses
DATA Bradley Kinkade 42 hours $12.50 per hour hard disk COMMANDS
print the timecard PROGRAMS timecard USER RESPONSES Yes, the
timecard entries are correct No, the timecard entries are not
correct INSTRUCTIONS
Slide 5
Input how?
Slide 6
Input 6 What are Input Devices? Hardware components used to
enter data and instructions into a computer scanners and reading
devices voice input keyboard pointing device video input digital
camera
Slide 7
The Keyboard (text, numbers, instructions) How is the keyboard
organized? Typing area Numeric keypad Function keys Special
keys
Slide 8
8 Most desktop computer keyboards have
Slide 9
The insertion point, also known as the cursor, is a symbol on
the screen that indicates where the next character you type will
appear 9
Slide 10
How a keyboard is connected ? USB Keyboard port Wired Keyboard
Bluetooth IrDA Wireless Keyboard 10
Slide 11
What is a wireless keyboard? Communicates with a receiver
attached to a port on the system unit Radio waves or infrared waves
are used to deliver signals
Slide 12
What is a portable keyboard? A portable keyboard is a
full-sized keyboard you attach to and remove from PDA
Slide 13
What is a virtual keyboard? A virtual keyboard is a software
and/or hardware component that allows a user to enter characters
On-screen virtual keyboard
Slide 14
An ergonomic keyboard has a design that reduces the chance of
wrist and hand injuries Ergonomics incorporates comfort,
efficiency, and safety into the design of the workplace 14
Slide 15
The Keyboard for mobile devices Keyboards on mobile devices
typically are smaller and/or have fewer keys Some phones have
predictive text input, which saves time when entering text using
the phones keypad 15
Slide 16
Pointing Devices 16
Slide 17
Mouse A mouse is a pointing device that fits under the palm of
your hand comfortably. Can be wired or wireless 17
Slide 18
Right- drag Right- click Double- click Common mouse operations
Point Click Drag Rotate wheel
Slide 19
What is an optical mouse? No moving mechanical parts inside
Senses light to detect mouses movement More precise than mechanical
mouse Connects using a cable, or wireless
Slide 20
What is a trackball? Stationary pointing device with a ball on
its top or side To move pointer, rotate ball with thumb, fingers,
or palm of your hand
Slide 21
Touchpad and a pointing stick Touchpad is small, flat,
rectangular pointing device sensitive to motion Pointing stick is
pointing device shaped like pencil eraser positioned between keys
on keyboard sensitive to pressure
Slide 22
What is a touch screen? Touch-sensitive areas of screen Often
used with kiosks
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Slide 24
What is a light pen? Handheld input device that can emits light
Press light pen against screen surface and then press button on pen
It allows the user to point to displayed objects, or draw on the
screen
Slide 25
Digital pen (text, numbers, graphics, instructions) Looks like
a ballpoint pen, but uses pressure to write text and draw lines
Used with tablet PCs
Slide 26
26 Microsoft Surface
Slide 27
What is a touch-sensitive pad? Input device on a portable media
player that enables users to scroll through and play music, view
pictures, watch videos or movies, adjust volume, and customize
settings
Slide 28
Other Input for Smart Phones 28
Slide 29
29
Slide 30
Insertion point: blinking vertical bar that indicates where
next character you type will display Mouse pointer: pixel on the
screen pointed by the mouse
Slide 31
Scanning and Reading What is a scanner? Light-sensing device
that reads printed text and graphics Used for image processing,
converting paper documents into electronic images Drum Pen or
Handheld Sheet-fed Flatbed
Slide 32
How does a flatbed scanner work? Step 1: Place the document to
be scanned face down on the glass window. Using buttons on the
scanner or the scanner program, start the scanning process. Step 2:
The scanner converts the document content to digital information,
which is transmitted through the cable to the memory of the
computer. Step 3: Once in the memory of the computer, users can
save it as a file, display the image, print it, e-mail it, include
it in a document, or place it on a Web page.
Slide 33
What is an optical reader? Optical character recognition (OCR)
reads characters in OCR font Optical mark recognition (OMR) reads
hand-drawn pencil marks, such as small circles Device that uses
light source to read characters, marks, and codes and then converts
them into digital data
Slide 34
What is a turnaround document? Document that you return to the
company that sent it Portion you return has information printed in
OCR characters
Slide 35
What is a data collection device? Obtains data directly at
location where transaction or event takes place Transmits data over
network or Internet
Slide 36
Data collection devices are used in: Restaurants Grocery stores
Factories Warehouses The outdoors 36
Slide 37
What is a bar code? Identification code that consists of a set
of vertical lines and spaces of different widths Universal Product
Code (UPC)
Slide 38
What is a bar code reader? Uses laser beams to read bar
codes
Slide 39
What is a magnetic-ink character recognition (MICR) reader? Can
read text printed with magnetized ink Banking industry uses MICR
for check processing
Slide 40
Magnetic stripe card reader reads the magnetic stripe on the
back of cards such as: 40 Credit cardsEntertainment cardsBank
cardsOther similar cards Warning: Exposure to a magnetic field can
erase the contents of a cards magnetic stripe
Slide 41
RFID RFID (radio frequency identification) uses radio signals
to communicate with a tag placed in or attached to an object The
tag can be smaller than a grain of sand. They can be read (both the
information on the tag and the location of the tag) at a distance
by an RFID reader. 41
Slide 42
The tag can be implanted into a thing or being with or without
persons knowledge. RFID can track: 42 Inventory Location of
soldiers Employees Airline baggage Tires Library books Prepaid
tolls Patients in the hospitals Children Sex offenders
SuspectsPrisoners
Slide 43
RFID Reads information on the tag via radio waves Can be
handheld devices or mounted in a stationary object
Slide 44
Audio Input is the process of entering any sound into the
computer 44 SpeechMusicSound Effects
Slide 45
How it functions? Electric waves created by a microphone go to
the sound card in the System Unit Sound card converts them to
digital form (analog to digital conversion ADC) In the digital form
sounds live in the computer After conversion from digital to analog
they come to output devices speakers
Slide 46
Voice Input and Voice Recognition Voice input is the process of
entering input by speaking into a microphone Voice recognition is
the computers capability of distinguishing spoken words 46
Slide 47
Music production device and software allows users to record,
compose, mix, and edit music and sounds 47
Slide 48
Images input Process of entering pictures, figures, symbols
into computer Digital cameras, scanners allow us to input
images
Slide 49
Digital Cameras Allow the user To take digital pictures To
download images to a computer To post pictures to the Web Images
are viewable immediately on the camera screen
Slide 50
How a digital camera works?
Slide 51
Two factors affect the quality (sharpness and clarity) of
digital camera photos: 51 Resolution is the number of pixels
(intersections of rows and columns) in a display device. Resolution
Bit width is the number of bits used to represent a pixel. The more
bits representing a pixel the more colors the pixel can carry
Number of bits stored in each pixel
Slide 52
Video input Process of entering motion images into computer
Video capture card converts analog video signal into digital signal
that computer can use Digital video (DV) camera records video as
digital signals
Slide 53
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Slide 54
PC video camera and Webcam PC video camera is used to capture
video and still images, and to make video telephone calls on
Internet
Slide 55
A Webcam is a type of digital video camera that enables a user
to: 55 Capture video and still images Send e-mail messages with
video attachments Add live images to instant messages Broadcast
live images over the Internet Make video telephone calls Webcam is
a video camera whose output displays on a Web page
Slide 56
What is video conferencing? Two or more geographically
separated people who use network or Internet to transmit audio and
video data
Slide 57
Special Input Devices A terminal is a computer that allows
users to send data to and/or receive information from a host
computer 57 A POS terminal records purchases, processes payment,
and updates inventory An automated teller machine (ATM) allows
users to access their bank accounts A DVD kiosk is a self- service
DVD rental machine
Slide 58
What is a point of sale (POS) terminal? Records purchases,
processes credit or debit cards, and updates inventory Swipe credit
or debit card through card reader Reads customers personal data
from magnetic strip
Slide 59
What is an automated teller machine (ATM)? Self-service banking
machine that connects to a host computer through a network
Slide 60
Biometric Input Authenticates persons identity by verifying
personal characteristic Fingerprint scanner captures curves of
fingerprint Hand geometry system measures shape and size of persons
hand
Slide 61
Biometrics authenticates a persons identity by verifying a
personal characteristic 61 Fingerprint reader Face recognition
system Hand geometry system Voice verification system Signature
verification system Iris recognition system Retinal scanners
Slide 62
Examples of biometric technology Voice verification system
compares live speech with stored voice pattern Signature
verification system recognizes shape of signature Iris recognition
system reads patterns in blood vessels in back of eye
Slide 63
Game Controllers Video games and computer games use a game
controller as the input device that directs movements and actions
of on-screen objects 63 Gamepads Joysticks and Wheels Light guns
Dance pads Motion- sensing controllers
Slide 64
Controllers for Gaming and Media Players Gamepad Joystick Wheel
Light gun Dance pad Motion-sensing game controller
Slide 65
Mercedes Benz SCL600 65
Slide 66
No steering wheel, no gas or brake pedals 66
Slide 67
Just a joystick (more info here)more info here 67
Slide 68
Input devices for those with physical limitations. Keyguard
allows users to rest hands on keyboard without accidentally
pressing keys Head-mounted pointer controls pointer on screen New
developments include gesture recognition and computerized implant
devices
Slide 69
To see the online addition to the book click here
Slide 70
70 Instructions can be entered into the computer in the form of
programs, commands, and user responses A program is a series of
instructions that tells a computer how to perform the task User
issues commands about when and what tasks (programs) to perform A
user response is the users reply to a question displayed by a
program
