Chapter 5 Input and Output

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Chapter 5Input and Output
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Chapter 5 Objectives
List the characteristicsof a keyboard
Describe the characteristics of CRT monitors, LCD
monitors, and LCD screens
Summarize how these pointing deviceswork mouse,
trackball, touchpad, pointing stick, joystick,
wheel, light pen, touch screen, stylus, and
digital pen
Summarize the various types of printers
Explain the characteristics of speakers and
headsets, fax machines and fax modems,
multifunction peripherals, and data projectors
Describe other types of input, including voice
input input devices for PDAs, Tablet PCs, and
smart phones digital cameras voice input
scanners and reading devices terminals and
biometric input
Identify input and output options for physically
challenged users
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What Is Input?

• What is input?

• Data or instructions entered into memory of
  computer

• Input device is any hardware component used to
  enter data or instructions

p. 156 Fig. 5-1
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Keyboard and Pointing Devices

• What is a keyboard?

• Input device containing keys users press to
  enter data into a computer

• Includes typing area, numeric keypad, and
  function keys

• Can be cordless or built-in

p. 157 Fig. 5-2
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Keyboard and Pointing Devices

• How do you use a mouse?

• As you move mouse, pointer on screen moves

Step 2. Move the mouse diagonally toward the
left until the pointer is positioned on the
Microsoft Outlook icon.
Step 1. Place the mouse toward the right of the
mouse pad.
p. 158 Fig. 5-3
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Keyboard and Pointing Devices

• What is a mouse?

• Pointing device that fits under palm of hand

• Pointing device controls movement of pointer,
  also called mouse pointer

• Mechanical mouse has rubber or metal ball on
  underside

p. 158 Fig. 5-4a
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Keyboard and Pointing Devices

• 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

p. 159 Fig. 5-4b
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Keyboard and Pointing Devices

• What is a trackball?

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

p. 159 Fig. 5-5
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Keyboard and Pointing Devices

• What are a touchpad and a pointing stick?

• Touchpad is small, flat, rectangular pointing
  device sensitive to pressure and motion

• Pointing stick is pointing device shaped like
  pencil eraser positioned between keys on keyboard

p. 160 Figs. 5-65-7
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Keyboard and Pointing Devices

• What are a joystick and a wheel?

• Joystick is vertical lever mounted on a base
• Wheel is steering-wheel-type input device
• Pedal simulates car brakes and accelerator

p. 160 Fig. 5-8
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Keyboard and Pointing Devices

• What is a light pen?

• Handheld input device that can detect light
• Press light pen against screen surface and then
  press button on pen

p. 161 Fig. 5-9
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Keyboard and Pointing Devices

• What is a touch screen?

• Touch areas of screen with finger

• Often used with kiosks

p. 161 Fig. 5-10
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Keyboard and Pointing Devices

• What is a stylus and a digital pen?

• Looks like a ballpoint pen, but uses pressure to
  write text and draw lines

• Used with graphics tablets, flat electronic boards

p. 161 Fig. 5-12
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Other Input Devices

• What is voice input?
• Entering data by speaking into a microphone
• Voice recognition or speech recognition is
  thecomputers capability to distinguish spoken
  words

p. 163
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Other Input Devices

• What is audio input?
• Entering sounds into a computer - speech,music,
  and sound effects
• MIDI - standard defining how digital
  musicaldevices represent sound electronically

p. 163 Fig. 5-13
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Other Input Devices

• How is a data entered into a PDA?

p. 164 Fig. 5-14
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Other Input Devices

• What is a docking station?

• External device that holds mobile computer
• Provides connections to peripherals

p. 165 Fig. 5-15
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Other Input Devices

• What is a smart phone?

• Users can input and send text messages, graphics,
  pictures, video clips, and sound files

p. 165
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Other Input Devices

• What is a digital camera?

• Allows you to take digital pictures

• Images viewable immediately on camera
• Download to computer
• Post pictures to Web

p. 165 Fig. 5-16
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Other Input Devices

• What is resolution?

• 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

p. 165
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Other Input Devices

• What is video input?

• Process of entering full-motion images into
  computer

• Digital video (DV) camera records video as
  digital signals

p. 166
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Other Input Devices

• What are a PC video camera and a Web cam?

• PC video cameraccDV camera used to capture video
  and still images, and to make video telephone
  calls on Internet
• Also called PC camera
• Web camccvideo camera whose output displays on
  a Web page

p. 166 Fig. 5-17
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Other Input Devices

• What is video conferencing?

• Two or more geographically separated people who
  use network on Internet to transmit audio and
  video data

p. 166 Fig. 5-18
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Other Input Devices

• What is a scanner?

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

p. 167 Fig. 5-19
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Other Input Devices

• What is an optical reader?

• 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

p. 167 Fig. 5-21
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Other Input Devices

• What is a turnaround document?

• Document that you return to the company that sent
  it
• Portion you return has information printed in OCR
  characters

p. 167 Fig. 5-20
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Other Input Devices
What is a magnetic-ink character recognition
(MICR) reader?

• Can read text printed with magnetized ink
• Banking industry almost exclusively uses MICR for
  check processing

p. 168 Fig. 5-22
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Other Input Devices

• 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
  readerccreads customers personal data from
  magnetic strip

p. 169 Fig. 5-23
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Other Input Devices

• What is an automated teller machine (ATM)?

• Self-service banking machine that connects to a
  host computer through a network

What is a smart display?

• Thin monitor that detaches from computer to
  function as portable wireless touch screen

p. 170 Fig. 5-24
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Other Input Devices

• What is biometrics?

• Authenticates persons identity by verifying
  personal characteristic

• Fingerprint scanner captures curves and
  indentations of fingerprint
• Hand geometry system measures shape and size of
  persons hand

p. 170 Fig. 5-25
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Other Input Devices

• What are 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

• Biometric data is sometimes stored on smart card,
  which stores personal data on microprocessor
  embedded in card

p. 171 Fig. 5-26
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What is Output?

• What is output?

• Data that has been processed into a useful
  form,called information

• Output device is any hardware component that can
  convey information to user

p. 172 Fig. 5-27
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Display Devices

• What is a display device?

• Output device that visually conveys information
• Information on display device sometimes called
  soft copy
• Monitor houses display device as separate
  peripheral

p. 173
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Display Devices

• What is a CRT monitor?

• Contains cathode-ray tube (CRT)

• Screen coated with tiny dots of phosphor material
• Each dot consists of a red, blue, and green
  phosphor
• Common sizes are 15, 17, 19, 21, and 22 inches
• Viewable size is diagonal measurement of actual
  viewing area

p. 174 Fig. 5-28
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Display Devices

• What is resolution?

• Sharpness and clarity of image

• Higher resolution makes image sharper, displays
  more text on screen, makes some elements smaller

• Refresh rate is speed at which monitor
  redrawsimages on screen

p. 174
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Display Devices

• How does video travel from the processor to a CRT
  monitor?

• Video card (also called a graphics card) converts
  digital output from computer into analog video
  signal

Step 5. Electron guns fire the three color
signals to the front of the CRT.
Step 1. The processor sends digital video data to
the video card.
Step 3. The analog signal is sent through a cable
to the CRT monitor.
Step 4. The CRT monitor separates the analog
signal into red, green, and blue signals.
Step 6. An image is displayed on the screen when
the electrons hit phosphor dots on the back of
the screen.
Step 2. The video cards digital-to-analog
converter (DAC) converts the digital video data
to an analog signal.
p. 175 Fig. 5-29
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Display Devices

• What is a flat panel display?

• Uses liquid crystal display
• Also called LCD monitor
• Consumes less than one-third the power
• Mobile devices that contain LCD displays include
• Notebook computer, Tablet PC, PDA, and Smart Phone

p. 176 Fig. 5-30
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Display Devices

• What is a gas plasma monitor?

• Displays image by applying voltage to layer of
  gas
• Larger screen size and higher display quality
  than LCD, but much more expensive

p. 177 Fig. 5-32
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Printers

• What is a printer?

• Output device that produces text and graphics on
  paper
• Purchasing a printer

p. 177 Fig. 5-33
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Printers

• What is an impact printer?

• Forms characters by striking mechanism against
  inked ribbon that contacts paper
• Dot-matrix printer producesprinted images when
  tiny wire pins strike ribbon
• Line printer prints entire lineat a time

p. 178 Fig. 5-34
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Printers

• What is a nonimpact printer?

• Forms characters and graphics without striking
  paper

• Ink-jet printer sprays tiny drops of liquid ink
  onto paper
• Prints in black-and-white or color on a variety
  of paper types

p. 178 Fig. 5-35
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Printers

• What is a photo printer?

• Color printer that produces photo-lab-quality
  pictures

Step 2. Insert media card into card reader on
photo printer.
p. 180 Fig. 5-36
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Printers

• What is a laser printer?

• High-speed, high-quality nonimpact printer

• Prints text and graphics in very high-quality
  resolution, ranging from 600 to 2,400 dpi
• Typically costs more than ink-jet printer, but
  is much faster

p. 181 Fig. 5-37
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Printers

• What is a thermal printer?

• Generates images by pushing electrically heated
  pins against heat-sensitive paper
• Dye-sublimation printer, (also called a digital
  photo printer) uses heat to transfer dye to
  specially coated paper

p. 181 Fig. 5-38
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Printers

• What is a mobile printer?

• Small, lightweight, battery-powered printer that
  allows mobile user to print from notebook
  computer, Tablet PC, or PDA while traveling

p. 182 Fig. 5-39
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Printers

• What is a plotter?

• Sophisticated printer used to produce
  high-quality drawings
• Large-format printer creates photo-realistic-quali
  tycolor prints

p. 182 Fig. 5-40
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Printers

• What is wireless printing?

• Output transmitted to printer wirelessly via
  infraredlight waves or radio waves

• Bluetooth printing uses radio waves
• Devices need to be within 30-foot range

p. 182
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Other Output Devices

• What is an audio output device?

• Computer component that produces music, speech,
  or other sounds

• Speakers and headsets are common devices

p. 183 Fig. 5-41
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Other Output Devices

• What is voice output?

• Computer talks to you through speakers on
  computer
• Internet telephony allows you to have
  conversationover Web

p. 183 Fig. 5-42
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Other Output Devices

• What is a facsimile (fax) machine?

• Device that transmits and receives documents over
  telephone lines

What is a fax modem?

• Modem that allows you to send and receive
  electronic documents as faxes

p. 184 Fig. 5-43
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Other Output Devices

• What is a multifunction peripheral?

• Provides functionality of printer, scanner,
  copy machine, and fax machine

p. 184 Fig. 5-44
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Other Output Devices

• What is a data projector?

• Device that takes image from computer screen and
  projects it onto larger screen

p. 185 Fig. 5-45
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Putting It All Together

• What are suggested output devices for the home
  user?

p. 186 Fig. 5-46
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Putting It All Together

• What are suggested output devices for the small
  office/home office user?

p. 186 Fig. 5-46
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Putting It All Together

• What are suggested output devices for the mobile
  user?

p. 186 Fig. 5-46
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Putting It All Together

• What are suggested output devices for the large
  business user?

p. 186 Fig. 5-46
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Putting It All Together

• What are suggested output devices for the power
  user?

p. 186 Fig. 5-46
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Input and Output Devices for Physically
Challenged Users

• What input devices are available for those with
  physical limitations?

• Keyboards with larger keys

• Head-mounted pointer controls pointer on screen

p. 187 Fig. 5-47
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Input and Output Devices for Physically
Challenged Users

• What other output options are available for
  visually impaired users?

• Change Window settings, such as increasing size
  or changing color of text to make words easier
  to read

• Blind users can work with voice output
• Braille printer outputs information in Braille
  onto paper

p. 187 Fig. 5-48
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Summary of Input and Output
Processing and organizinginput into output
Data and instructions
Various techniques of input
Various methods of output
Commonly used input devices
Commonly used output devices
Chapter 5 Complete