77 CHAPTER INPUT AND OUTPUT. © 2005 The McGraw-Hill Companies, Inc. All Rights Reserved. 7-2...
-
date post
22-Dec-2015 -
Category
Documents
-
view
213 -
download
1
Transcript of 77 CHAPTER INPUT AND OUTPUT. © 2005 The McGraw-Hill Companies, Inc. All Rights Reserved. 7-2...
7-2
© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved.
Competencies
Define input
Describe keyboard entry, pointing devices, & scanning devices
Discuss image capturing devices, digitizing devices, & audio input devices
7-3
© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved.
Competencies cont.
Define output
Describe monitors, printers, and audio output devices
Discuss combination input & output devices
7-4
© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved.
What is Input?
Any data or instructions used by a computer
Input devicesHardware
Keyboards
Mice
Scanners
Other devices
Translates data into a form that the system unit can process
7-5
© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved.
Keyboard Entry
KeyboardsTraditional keyboards
Flexible keyboards
Ergonomic keyboards
Wireless keyboards
PDA keyboards
FeaturesTypewriter keyboard with numeric pad
Special purpose keys
Toggle and combination keys
7-7
© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved.
Pointing Devices
MouseMechanical
Optical
Cordless or wireless
Joystick
Touch Screen
Light Pen
7-8
© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved.
Scanning Devices
Optical scannersFlatbed
Portable
Bar code readersHandheld wand readers or platform scanners
Contain photoelectric cells that read bar codes
7-9
© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved.
Scanning Devices
Character and mark recognition devices
Scanners that recognize special characters & marks
Magnetic ink character recognition (MICR)
Optical-character recognition (OCR)
Optical-mark recognition (OMR)
7-10
© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved.
Image Capturing Devices
Digital cameraImages recorded digitally on a disk
Images can be downloaded to a computer
Digital video camera Records motion digitally
Can take still images as well
WebCamsSpecialized digital video cameras
Broadcast images over the Internet
7-11
© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved.
Digitizing Devices
Graphics Tablets
Digital Notepads
7-12
© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved.
Audio Input Devices
VoiceVoice recognition systems
Discrete-speech recognition systems
Continuous-speech recognition system
MusicMusical Interface Digital Interface (MIDI)
7-13
© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved.
What is Output?
Processed data or information
Types of outputText
Graphics
Audio & video
Output devicesMonitors
Printers
7-14
© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved.
Monitors
Known as screens or display screens
Output referred to as soft copy
Features Resolution
Dot pitch
Refresh rate
Size
7-15
© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved.
Monitors
Most frequently used output device
Size is measured by diagonal of screen
Common sizes: 15, 17, 19, 21 inches
Clarity is indicated by resolution
Measured in pixels
More pixels = better clarity
computing ESSENTIALS
7-16
© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved.
Monitor Standards
Resolution capabilities indicated by a monitor’s
standard
Super Video Graphics Array (SVGA)
Extended Graphics Array (XGA)
Super Extended Graphics Array (SXGA)
Ultra Extended Graphics Array (UXGA)
computing ESSENTIALS
7-17
© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved.
Monitor Types
Cathode-Ray Tubes (CRT)
Most common
Flat-panel monitors
Passive-matrix
Active-matrix
eBook readers
Data projectors
High-definition television (HDTV)
computing ESSENTIALS
7-18
© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved.
Printers
Translates information that has been processed by the system unit
Output referred to as hard copy
FeaturesResolution
Color capability
Speed
Memory
7-19
© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved.
Printers
Ink-jet printer
Laser printerPersonal laser printers
Shared laser printers
Thermal printer
Other printersDot-matrix
Plotters
Photo printers
7-20
© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved.
Audio Output Devices
Translates audio information into sounds that people can understand
Common devicesSpeakers
Headphones
7-21
© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved.
Combination Input and Output Devices
Fax machines
Multifunction devices
Internet telephonesTelephony
Voice-over IP (VoIP)
Terminals
7-22
© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved.
Terminals
An input and output device
Connects to a mainframe or server
Types of terminalsDumb terminal
Intelligent terminal
Network terminal
Internet terminal