Discovering Computers Fundamentals, 2011 Edition · options for physically challenged users...
Transcript of Discovering Computers Fundamentals, 2011 Edition · options for physically challenged users...
Discovering Computers
Fundamentals,
2011 Edition
Living in a Digital World
Objectives Overview
Identify the keys and buttons commonly found on desktop
computer keyboards, and describe how keyboards for
mobile computers and devices differ from desktop computer
keyboards
Describe different mouse types
Describe various types of touch screens and explain how a touch-sensitive pad works
Describe various types of pen input
Discovering Computers Fundamentals, 2011 Edition Chapter 5
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for Detailed Objectives
Objectives Overview
Explain other types of input
Explain the characteristics of LCD monitors, LCD
screens, and CRT monitors
Summarize the various types of printers
Identify the purpose and features of speakers,
headphones, and ear-buds; data projectors; and
interactive whiteboards
Identify input and output options for physically
challenged users
Discovering Computers Fundamentals, 2011 Edition Chapter 5
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for Detailed Objectives
What Is Input?
• Input is any data and instructions entered into the memory of a computer
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Figure 5-1
What Is Input?
An input device is any hardware component that allows users to enter data and
instructions into a computer
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Keyboard and Pointing Devices
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Keyboard and Pointing Devices
• A keyboard is an input device that contains keys users press to enter data and instructions into a computer
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Figure 5-2
Keyboard and Pointing Devices
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• Most desktop computer keyboards have…
Keyboard and Pointing Devices
• 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
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Keyboard and Pointing 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 phone’s keypad
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Figure 5-3
Keyboard and Pointing Devices
• A mouse is a pointing device that fits under the palm of your hand comfortably
– Most widely used pointing device on desktop computers
• A mouse can be wired or wireless
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Figure 5-4
Keyboard and Pointing DevicesTr
ackb
all • A trackball is a
stationary pointing device with a ball on its top or side To
uch
pad • A touchpad is
a small, flat, rectangular pointing device that is sensitive to pressure and motion Po
inti
ng
Stic
k • A pointing stick is a pressure-sensitive pointing device shaped like a pencil eraser that is positioned between keys on a keyboard
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Figures 5-5 – 5-7
Touch Screens and Touch-Sensitive Pads
• A touch screen is a touch-sensitive display device
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Figure 5-8
Click to view Web Link,click Chapter 5, Click Web Link from left navigation, then click Multi-Touch Screensbelow Chapter 5
Touch Screens and Touch-Sensitive Pads
Microsoft Surface Touch-sensitive pads
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Figures 5-9 – 5-10
Pen Input
• With pen input, you touch a stylus or digital pen on a flat surface to write, draw, or make selections
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Figure 5-11
Other Types of Input
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Figure 5-12
Other Types of Input
• Video games and computer games use a game controlleras the input device that directs movements and actions of on-screen objects
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GamepadsJoysticks and
WheelsLight guns Dance pads
Motion-sensing
controllersWii Remote
Click to view Web Link,click Chapter 5, Click Web Link from left navigation, then click Game Controllersbelow Chapter 5
Other Types of Input
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Figure 5-13
Other Types of Input
• A digital camera is a mobile device that allows users to take pictures and store them digitally
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Studio cameras
Field cameras
Point-and-shoot camera
Other Types of Input
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Figure 5-14
Other Types of Input
• Two factors affect the quality of digital camera photos:
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• Resolution is the number of horizontal and vertical pictures in a display device
• A pixel is the smallest element in an electronic display
Resolution
Other Types of Input
• Voice input is the process of entering input by speaking into a microphone
• Voice recognition is the computer’s capability of distinguishing spoken words
• Audio input is the process of entering any sound into the computer
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Other Types of Input
• Music production software allows users to record, compose, mix, and edit music and sounds
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Figure 5-15
Other Types of Input
• Video input is the process of capturing full-motion images and storing them on a computer’s storage medium
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Record video on a digital video (DV) camera or use a video capture card to convert analog signals to digital
Connect the camera to a port on the system unit
Transfer video and images
Other Types of Input
• A Web cam is a type of digital video camera that enables a user to:
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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
Other Types of Input
• A video conference is a meeting between two or more geographically separated people
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Figures 5-16 – 5-17
Other Types of Input
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Figure 5-18
• A flatbed scanner creates a file of the document in memory
– Works in a manner similar to a copy machine
Other Types of Input
• Optical character recognition (OCR) involves reading characters from ordinary documents
• A turnaround document is a document you return to the company that creates and sends it
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Figure 5-19
Other Types of Input
• Optical mark recognition (OMR) reads hand-drawn marks such as small circles or rectangles
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Other Types of Input
• A bar code reader, also called a bar code scanner uses laser beams to read bar codes
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Figure 5-20
Other Types of Input
• RFID (radio frequency identification) uses radio signals to communicate with a tag placed in or attached to an object
• An RFID reader reads information on the tag via radio waves
• RFID can track:
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Tracking times of runners in a marathon
Tracking location of soldiers
Employee wardrobes
Airline baggageChecking lift
tickets of skiers
Managing inventory
Gauging pressure and temperature
of tires
Checking out library books
Tracking toll payments
Other Types of Input
• Magnetic stripe card readers read the magnetic stripe on the back of cards such as:
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Figure 5-22
Credit cards
Entertainment cards
Bank cards
Other similar cards
Other Types of Input
• MICR (magnetic ink character recognition) devices read text printed with magnetized ink
• An MICR reader converts MICR characters into a form the computer can process
• Banking industry uses MICR for check processing
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Figure 5-23
Other Types of Input
• Biometrics authenticates a person’s identity by verifying a personal characteristic
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Fingerprint reader
Face recognition
system
Hand geometry
system
Voice verification
system
Signature verification
system
Iris recognition
system
Retinal scanners
Other Types of Input
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Figures 5-24 – 5-25
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fingerprint reader
iris recognition
system
Other Types of Input
• A terminal is a computer that allows users to send data to and/or receive information from a host computer
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Figures 5-26 – 5-28
A POS terminalrecords 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
What Is Output?
• Output is data that has been processed into a useful form
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Figure 5-29
What Is Output?
• An output device is any type of hardware component that conveys information to one or more people
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Display devices
PrintersSpeakers,
headphones, and earbuds
Data projectors
Interactive whiteboards
Display Devices
• A display device visually conveys text, graphics, and video information
• A monitor is packaged as a separate peripheral
– LCD monitor
– Widescreen
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Figure 5-30
Click to view Web Link,click Chapter 5, Click Web Link from left navigation, then click Widescreen LCD Monitors below Chapter 5
Display Devices
• Liquid crystal display (LCD) uses a liquid compound to present information on a display device
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Resolution Response time Brightness
Dot pitch Contrast ratio
Display Devices
• Plasma monitors are display devices that use gas plasma technology and offer screen sizes up to 150 inches
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Figure 5-32
Display Devices
• A CRT monitor is a desktop monitor that contains a cathode-ray tube
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Figure 5-33
Printers
• A printerproduces text and graphics on a physical medium
• Before purchasing a printer, ask yourself a series of questions
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Figure 5-34
Printers
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Figure 5-35
Printers
• A nonimpact printer forms characters and graphics on a piece of paper without actually striking the paper
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Ink-jet printers
Photo printers
Laser printers
Thermal printers
Mobile printers
PlottersLarge-format printers
Printers
• An ink-jet printer forms characters and graphics by spraying tiny drops of liquid ink onto a piece of paper
– Color or black-and-white
– Printers with a higher dpi (dots per inch) produce a higher quality output
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Figure 5-36
Printers
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Figure 5-37
Click to view Web Link,click Chapter 5, Click Web Link from left navigation, then click Photo Printers below Chapter 5
A photo printer produces color photo-lab-quality pictures
• Most use ink-jet technology
• PictBridge allows you to print photos directly from a digital camera
• Print from a memory card and preview photos on a built-in LCD screen
Printers
Laser printer
High-speed
High-quality
Color
Black-and-white
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Figure 5-38
Click to view Web Link,click Chapter 5, Click Web Link from left navigation, then click Laser Printers below Chapter 5
Printers
• A multifunction peripheral (MFP) is a single device that prints, scans, copies, and in some cases, faxes
– Sometimes called an all-in-one device
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Figure 5-39
Printers
• A thermal printer generates images by pushing electrically heated pins against the heat-sensitive paper
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Figure 5-40
Dye-sublimation
printer
Printers
• A mobile printer is a small, lightweight, battery-powered printer that allows a mobile user to print from a mobile device
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Figure 5-41
Printers
• Plotters are used to produce high-quality drawings
• Large-format printers create photo-realistic quality color prints on a larger scale
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Figure 5-42
Printers
• Impact printers form characters and graphics on a piece of paper by striking a mechanism against an inked ribbon that physically contacts the paper
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Dot-matrix printer
Line printer
Printers
• A dot-matrix printerproduces printed images when tiny wire pins on a print head mechanism strike an inked ribbon
• A line printer prints an entire line at a time
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Figure 5-43
Other Output Devices
• An audio output device produces music, speech, or other sounds
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Figure 5-44
Most computer users attach speakers to their computers to:
• Generate higher-quality sounds for playing games
• Interact with multimedia presentations
• Listen to music
• View movies
Other Output Devices
• Headphones are speakers that cover or are placed outside of the ear
• Earbuds (also called earphones) rest inside the ear canal
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Other Output Devices
Voice output occurs when you hear a person’s voice or when the computer talks to you through the speakers
• Some Web sites dedicate themselves to providing voice output
• Often works with voice input
• VoIP uses voice output and voice input
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Other Output Devices
• A data projector is a device that takes the text and images displaying on a computer screen and projects them on a larger screen
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Figure 5-45
Putting It All Together
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Figure 5-47
Putting It All Together
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Figure 5-47
Putting It All Together
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Figure 5-47
Input and Output Devices for Physically Challenged Users
Braille printer
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Figures 5-48 – 5-49
Head-mounted pointer
Summary
Various techniques for entering input and several commonly used input device
Various methods of output and several
commonly used output devices
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Discovering Computers
Fundamentals,
2011 Edition
Living in a Digital World
Chapter 5 Complete