Chapter 5 Objectives
List the characteristics of a keyboard
Describe the characteristics of LCD monitors, LCD screens, and CRT monitors
Summarize how these pointing devices work: mouse, trackball, touchpad, pointing stick, joystick, wheel, audio player, control pad, gamepad, light pen, touch screen, stylus, and digital pen
Summarize the various types of printers
Explain the characteristics of speakers, headphones and earphones; fax machines and fax modems, multifunction peripherals, and data projectors Describe other types of input, including voice input; input devices for PDAs, smart phones, and Tablet
PCs; digital cameras; voice input; scanners and reading devices; terminals; and biometric input
Identify input and output options for physically challenged users

What Is Input?
• What is input?
 Data or instructions entered into the memory of
 computer
Input device is any hardware component used to enter data or instructions into a computer

Keyboard and Pointing Devices
• What is a keyboard?
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Input device that contains keys users press to enter data into a computer
Includes typing area, numeric keypad, and function keys
Can be cordless or built-in

Keyboard and Pointing Devices
• What is a mouse?

 Pointing device that fits under the palm of your hand
Mechanical mouse has rubber or metal ball on its underside mouse buttons wheel button ball mouse pad

Keyboard and Pointing Devices
• What is an optical mouse?
 No moving mechanical parts inside
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Senses light to detect mouse’s movement
More precise than mechanical mouse
More expensive than a mechanical mouse

Keyboard and Pointing Devices
• What is a trackball?
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Stationary pointing device with a ball on its top or side
To move pointer, rotate ball with thumb, fingers, or palm of hand

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

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Keyboard and Pointing Devices
• What are a joystick and a
Wheel is steering-wheel-type input device
 Pedal simulates car brakes and accelerator

Other Pointing Devices
• What is a control pad and a gamepad?
 Control pad on an audio player allows users to scroll through music, adjust volume, and customize settings
 Gamepad a pointing device that controls the movement and actions of players or objects in games

Keyboard and Pointing Devices
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• What is a touch screen?
Touch areas of screen with finger
Often used with kiosks

Keyboard and Pointing Devices
• What is a stylus and a digital pen?
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Used with graphics tablets, flat electronic boards
Looks like a ballpoint pen, but uses pressure to write text and draw lines

Other Input Devices
• What is voice input?
 Entering data by speaking into a microphone
 Voice recognition or speech recognition is the computer’s capability to distinguish spoken words

Other Input Devices
• What is audio input?
 Entering sounds into a computer - speech, music, and sound effects
 MIDI - standard defining how digital musical devices represent sound electronically

PDAs, Tablet PCs, and Smart
Phones
• What is a Tablet PC?
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Mobile computer that includes handwriting recognition software
Primary input device is a pressure-sensitive digital pen

Other Input Devices
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• What is a digital camera?
Allows you to take digital pictures
Images viewable immediately on camera
 Download to computer
 Post pictures to Web

Other Input Devices
• What is resolution?
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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

Other Input Devices
• What is video input?
 Process of storing full-motion images on a computer’s storage medium
 Digital video (DV) camera records video as digital signals

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Other Input Devices
• What is a
PC video camera and a Web cam?
PC video camera—DV camera used to capture video and still images, and to make video telephone calls on Internet
 Also called PC camera
Web cam—video camera that displays its output on a
Web page

Other Input Devices
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• What is video conferencing?
Two or more geographically separated people who use network on Internet to transmit audio and video data

Other Input Devices
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• What is a scanner?
Light-sensing device that reads printed text and graphics
 Used for image processing, converting paper documents into electronic images

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

Other Input Devices
• What is an RFID reader?
 Reads information on the tag via radio waves
 Can be handheld devices or mounted in a stationary object

Other Input Devices
• What is a magnetic stripe card reader?
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Reads the magnetic stripe on the back of a credit card
Exposure to a magnetic field can erase the contents of a card’s magnetic stripe

Other Input Devices
What is a magnetic-ink character recognition
(MICR) reader?
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Can read text printed with magnetized ink
Banking industry almost exclusively uses MICR for check processing

Other Input Devices
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• What is a point of sale (POS) terminal?
Records purchases, processes credit or debit cards, and updates inventory

Other Input Devices
• What is an automated teller machine (ATM)?
 Self-service banking machine that connects to a host computer through a network

Other Input Devices
• What is biometrics?
 Authenticates person’s identity by verifying a personal characteristic
 Fingerprint scanner captures curves and indentations of fingerprint

Other Input Devices
• What are examples of biometric
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 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

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 one or more people

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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

Display Devices
• What is an LCD monitor?
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Uses liquid crystal display
Have a small footprint
Mobile devices that contain LCD displays include
 Notebook computer, Tablet
PC, PDA, and Smart Phone

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Display Devices
• What is a plasma monitor?
Displays image by applying voltage to layer of gas
 Larger screen size and higher display quality than LCD, but are more expensive

Display Devices
• What is a CRT monitor?
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Contains cathode-ray tube
(CRT)
Common sizes are 15, 17, 19,
21, and 22 inches
 Viewable size is diagonal measurement of actual viewing area

Display Devices
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• What determines the quality of a CRT monitor?
Screen resolution
Text created with a smaller dot pitch is easier to read
Refresh rate is speed at which monitor redraws images on screen

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Printers
Output device that produces text and graphics on a physical medium printer cable wireless printers various ways to print cable docking station media card

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

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Printers
• What is a photo printer?
Color printer that produces photo-lab-quality pictures
Many photo printers have a built-in card slot

Printers
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• What is a laser printer ?
High-speed, high-quality nonimpact printer
Prints text and graphics in very highquality resolution, ranging from 1,200 to 2,400 dpi
Typically costs more than ink-jet printer, but is much faster

Printers
• What is a thermal printer ?
 Generates images by pushing electrically heated pins against heatsensitive paper
 Dye-sublimation printer, (also called a digital photo printer) uses heat to transfer dye to specially coated paper

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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, PDA, or smart phone while traveling

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• What is a plotter ?
Printers
Sophisticated printer used to produce high-quality drawings
Large-format printer creates photo-realistic-quality color prints

Printers
• What is an impact printer ?
 Forms characters by striking mechanism against inked ribbon that contacts paper
 Dot-matrix printer produces printed images when tiny wire pins strike ribbon
 Line printer prints entire line at a time

Other Output Devices
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• What is an audio output device ?
Computer component that produces music, speech, or other sounds
Speakers, earphones, and ear buds are common devices

Other Output Devices
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What is voice output?
Computer talks to you through speakers on computer
Internet telephony allows you to have conversation over Web
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

Other Output Devices
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• What is a multifunction peripheral ?
Provides functionality of printer, scanner, copy machine, and fax machine

Other Output Devices
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What is a data projector?
Device that takes image from computer screen and projects it onto larger screen

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What input devices are available for those with physical limitations?
Keyboards with larger keys
Head-mounted pointer controls pointer on screen

What other output options are available for visually impaired users?
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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

Summary of Input and Output
Data and instructions
Various techniques of input
Commonly used input devices
Processing and organizing input into output
Various methods of output
Commonly used output devices

Questions?