Your Interactive Guide to the Digital World Discovering Computers Fundamentals, 2012 Edition.
Discovering Computers Fundamentals, 2012 Edition Chapter Five: Input.
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Discovering Computers Fundamentals, 2012 Edition Chapter Five: Input
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Transcript of Discovering Computers Fundamentals, 2012 Edition Chapter Five: Input.
Discovering Computers Fundamentals, 2012 Edition
Chapter Five: Input
2
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
See Page 187 for Detailed Objectives
3
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
See Page 187 for Detailed Objectives
4
What Is Input?
• Input is any data and instructions entered into the memory of a computer
Pages 188– 189 Figure 5-1
5
What Is Input?
An input device is any hardware
component that allows users to enter data and
instructions into a computer
Page 188
6
Keyboard and Pointing Devices
• A keyboard is an input device that contains keys users press to enter data and instructions into a computer
Page 190 Figure 5-2
7
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
Page 191 Figure 5-3
8
Keyboard and Pointing Devices
Trackball• A trackball is a
stationary pointing device with a ball on its top or side
Touchpad• A touchpad is
a small, flat, rectangular pointing device that is sensitive to pressure and motion
Pointing Stick• A pointing
stick is a pressure-sensitive pointing device shaped like a pencil eraser that is positioned between keys on a keyboard
Page 192Figures 5-5 – 5-7
9
Touch Screens and Touch-Sensitive Pads
• A touch screen is a touch-sensitive display device
Page 193Figure 5-8
10
Touch Screens and Touch-Sensitive Pads
Microsoft Surface Touch-sensitive pads
Page 193Figures 5-9 – 5-10
11
Pen Input
• With pen input, you touch a stylus or digital pen on a flat surface to write, draw, or make selections
Page 194 Figure 5-11
12
Other Types of Input
Page 195 Figure 5-12
13
Other Types of Input
Page 196 Figure 5-13
14
Other Types of Input
Page 197 Figure 5-14
15
Other Types of Input
• Two factors affect the quality of digital camera photos:
Page 198
• Resolution is the number of horizontal and vertical pixels in a display device
• A pixel is the smallest element in an electronic displayResolution
16
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
Page 198
17
Other Types of Input
• A video conference is a meeting between two or more geographically separated people
Page 199Figures 5-16 – 5-17
18
Other Types of Input
Page 200 Figure 5-18
• A flatbed scanner creates a file of the document in memory–Works in a manner similar to a copy
machine
19
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
Page 200Figure 5-19
20
Other Types of Input
• Optical mark recognition (OMR) reads hand-drawn marks such as small circles or rectangles
Page 200
21
Other Types of Input
• A bar code reader, also called a bar code scanner uses laser beams to read bar codes
Page 201 Figure 5-20
22
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:
Page 201
Times of runners in a marathon
Location of soldiers
Employee wardrobes
Airline baggage
Lift tickets of skiers
InventoryPressure and temperature
of tires
Checked out library books Toll payments
23
Other Types of Input
• Magnetic stripe card readers read the magnetic stripe on the back of cards such as:
Pages 201 Figure 5-22
Credit cards
Entertainment cards
Bank cards
Other similar cards
24
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
Page 202 Figure 5-23
25
Other Types of Input
• Biometrics authenticates a person’s identity by verifying a personal characteristic
Pages 202 - 203
Fingerprint reader
Face recognition
system
Hand geometry
system
Voice verification
system
Signature verification
system
Iris recognition system
Retinal scanners
26
Other Types of Input
Pages 202 – 203Figures 5-24 – 5-25
fingerprint reader
iris recognition
system
27
Other Types of Input
• A terminal is a computer that allows users to send data to and/or receive information from a host computer
Pages 204 – 205Figures 5-26 – 5-28
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
28
What Is Output?
• Output is data that has been processed into a useful form
Pages 206 – 207 Figure 5-29
29
Display Devices
• A display device visually conveys text, graphics, and video information
• A monitor is packaged as a separate peripheral– LCD monitor– Widescreen
Pages 207 – 208Figure 5-30
30
Display Devices
• Liquid crystal display (LCD) uses a liquid compound to present information on a display device
Page 209
Resolution Response time Brightness
Dot pitch Contrast ratio
31
Display Devices
• Plasma monitors are display devices that use gas plasma technology and offer screen sizes up to 150 inches
Page 210 Figure 5-32
32
Display Devices
• A CRT monitor is a desktop monitor that contains a cathode-ray tube
Page 210 Figure 5-33
33
Printers
• A printer produces text and graphics on a physical medium
• Before purchasing a printer, ask yourself a series of questions
Page 211 Figure 5-34
34
Printers
• A nonimpact printer forms characters and graphics on a piece of paper without actually striking the paper
Page 213
Ink-jet printers
Photo printers
Laser printers
Thermal printers
Mobile printers Plotters
Large-format printers
35
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
Page 213 Figure 5-36
36
Printers
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 screenPage 214
37
Printers
Laser printer
High-speed
High-quality
Color
Black-and-white
Pages 214 – 215 Figure 5-38
38
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
Page 215 Figure 5-39
39
Printers
• A thermal printer generates images by pushing electrically heated pins against the heat-sensitive paper
Pages 215 – 216 Figure 5-40
Dye-sublimation
printer
40
Printers
• Plotters are used to produce high-quality drawings
• Large-format printers create photo-realistic quality color prints on a larger scale
Page 216 Figure 5-42
41
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
Page 217
Dot-matrix printer
Line printer
42
Printers
• A dot-matrix printer produces 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
Page 217 Figure 5-43
43
Other Output Devices
• An audio output device produces music, speech, or other sounds
Page 217 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
44
Other Output Devices
• Headphones are speakers that cover or are placed outside of the ear
• Earbuds (also called earphones) rest inside the ear canal
Page 218
45
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
Page 218
46
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
Page 218 Figure 5-45
47
Other Output Devices
• An interactive whiteboard is a touch-sensitive device, resembling a dry-erase board, that displays the image on a connected computer screen
Page 218Figure 5-46
48
Input and Output Devices for Physically Challenged Users
Braille printer
Pages 220 – 221Figures 5-48 – 5-49
Head-mounted pointer
