77 CHAPTER INPUT AND OUTPUT

© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved. 7-2 Competencies Define input Describe keyboard entry, pointing devices, & scanning devices Discuss image capturing devices, digitizing devices, & audio input devices

© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved. 7-3 Competencies cont. Define output Describe monitors, printers, and audio output devices Discuss combination input & output devices

© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved. 7-4 What is Input? Any data or instructions used by a computer Input devices Hardware Keyboards Mice Scanners Other devices Translates data into a form that the system unit can process

© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved. 7-5 Keyboard Entry Keyboards Traditional keyboards Flexible keyboards Ergonomic keyboards Wireless keyboards PDA keyboards Features Typewriter keyboard with numeric pad Special purpose keys Toggle and combination keys

© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved. 7-6 Traditional Keyboard

© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved. 7-7 Pointing Devices Mouse Mechanical Optical Cordless or wireless Joystick Touch Screen Light Pen

© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved. 7-8 Scanning Devices Optical scanners Flatbed Portable Bar code readers Handheld wand readers or platform scanners Contain photoelectric cells that read bar codes

© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved. 7-9 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)

© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved Image Capturing Devices Digital camera Images recorded digitally on a disk Images can be downloaded to a computer Digital video camera Records motion digitally Can take still images as well WebCams Specialized digital video cameras Broadcast images over the Internet

© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved Digitizing Devices Graphics Tablets Digital Notepads

© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved Audio Input Devices Voice Voice recognition systems Discrete-speech recognition systems Continuous-speech recognition system Music Musical Interface Digital Interface (MIDI)

© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved What is Output? Processed data or information Types of output Text Graphics Audio & video Output devices Monitors Printers

© 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

© 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    

© 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    

© 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    

© 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 Features Resolution Color capability Speed Memory

© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved Printers Ink-jet printer Laser printer Personal laser printers Shared laser printers Thermal printer Other printers Dot-matrix Plotters Photo printers

© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved Audio Output Devices Translates audio information into sounds that people can understand Common devices Speakers Headphones

© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved Combination Input and Output Devices Fax machines Multifunction devices Internet telephones Telephony Voice-over IP (VoIP) Terminals

© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved Terminals An input and output device Connects to a mainframe or server Types of terminals Dumb terminal Intelligent terminal Network terminal Internet terminal

© 2005 The McGraw-Hill Companies, Inc. All Rights Reserved A Look to the Future Neural Signals Inc. Brain machine interface Allows humans to control machines with their thoughts Individuals incapable of communication Physically immobile people