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COMP 6005 An Introduction to Computing

COMP 6005 An Introduction to Computing. Session Two: Computer Hardware Input and Output. Introduction. Input – any data or instructions entered into the memory of a computer Output – data that has been processed into a useful form. Input. Instructions can be in the form of:

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COMP 6005 An Introduction to Computing

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  1. COMP 6005 An Introduction to Computing Session Two: Computer Hardware Input and Output

  2. Introduction • Input – any data or instructions entered into the memory of a computer • Output – data that has been processed into a useful form COMP 6005 An Introduction to Computing - Session Two: Computer Hardware

  3. Input • Instructions can be in the form of: • Program: series of instructions telling a computer what to do and how to do it • Command: an instruction that causes a particular program to perform a specific action • User response: an instruction given by a user by replying to a question displayed by a program COMP 6005 An Introduction to Computing - Session Two: Computer Hardware

  4. Input Devices • Any hardware component that permits users to enter data or instructions into a computer • Popular devices – light pen, keyboard, mouse, stylus, microphone, digital camera, scanner COMP 6005 An Introduction to Computing - Session Two: Computer Hardware

  5. Keyboards • Issue 5-1, pg 232 • Describe the Dvorak keyboard and compare the differences between the commonly used QWERTY keyboard COMP 6005 An Introduction to Computing - Session Two: Computer Hardware

  6. Mouse • Types: • Mechanical • Rubber or metal ball on its underside • Electronic circuits translate movements into signals that computer can process • Optical • Uses devices that emit and sense light to detect the mouse’s movements • Can be placed on nearly any surface (except glass) • Cordless • Battery-powered device that transmits data using wireless techonology (radio wave or infrared light waves) COMP 6005 An Introduction to Computing - Session Two: Computer Hardware

  7. Trackball Touchpad Pointing Stick Touch Screen Stylus and digital pen Cursor Other Pointing Devices COMP 6005 An Introduction to Computing - Session Two: Computer Hardware

  8. Assignment • What is a cursor in reference to input devices? Describe and include an image • Compare and contrast the display pen and the stylus • Discuss voice recognition and its applications COMP 6005 An Introduction to Computing - Session Two: Computer Hardware

  9. Voice and Audio Input • Voice input • Process of entering data by speaking into a microphone • Audio input • Process of entering any sound into the computer: speech, music, sound effect • Inputs via microphone, tape players, CD/DVD players, radios being plugged into a port on the sound card COMP 6005 An Introduction to Computing - Session Two: Computer Hardware

  10. Discussion • Looking Ahead 5-1, pg 241 • Issue 5-3, pg 247 COMP 6005 An Introduction to Computing - Session Two: Computer Hardware

  11. Video Input • Process of capturing full-motion images into a computer and storing them on a storage medium • Types: • Digital video cameras • PC video cameras • Web cams COMP 6005 An Introduction to Computing - Session Two: Computer Hardware

  12. Other Input Devices • Scanners • Optical • Optical readers • Bar code reader • (Magnetic-ink Character Recognition) MICR Reader • Data collection devices COMP 6005 An Introduction to Computing - Session Two: Computer Hardware

  13. Terminals • Point-of-Sale terminals • Automated Teller Machines • Smart Displays COMP 6005 An Introduction to Computing - Session Two: Computer Hardware

  14. Biometric Input • Fingerprint scanner • Face recognition system • Hand geometry system • Voice verification system • Iris recognition system COMP 6005 An Introduction to Computing - Session Two: Computer Hardware

  15. Biometric Input • Issue 5-5, pg 261 • http://www.ibiometrics.net/BioBasics.htm COMP 6005 An Introduction to Computing - Session Two: Computer Hardware

  16. Input Devices For Differently-Abled Users • Limited hand mobility persons use a keyguard to stop them from accidentally pressing keys • On-screen keyboard • Trackballs attached to a table, whhelchair or held in user’s hand • Head-mounted pointers can control the pointer or insertion point COMP 6005 An Introduction to Computing - Session Two: Computer Hardware

  17. Gesture Recognition • Still in prototype stage • Computer detects human motions • Potential to recognize sign language, read lips, track facial movements, follow eye gazes COMP 6005 An Introduction to Computing - Session Two: Computer Hardware

  18. Implants • Paralyzed or speech impaired individuals can have a doctor implant a computerized device into the brain • As the user thinks thoughts, the transmitter will send signals to the computer • Looking Ahead 5-2, pg 264 COMP 6005 An Introduction to Computing - Session Two: Computer Hardware

  19. Output • Users view output on: • Screens • Via PDAs, monitors, notebooks, tablet PCs, smart phones • Can view web sites, documents, videos, email, etc • Print it • Can view photographs, black-and-white documents, coloured graphics • Hear it through speakers or headset • Can listen to music, sounds, voice messages COMP 6005 An Introduction to Computing - Session Two: Computer Hardware

  20. Output • Four basic categories of output • Sound • Text • Graphics • Video COMP 6005 An Introduction to Computing - Session Two: Computer Hardware

  21. Display Devices • Output device that shows text, graphics and video information • Types of display devices • CRT monitor • Flat-panel display COMP 6005 An Introduction to Computing - Session Two: Computer Hardware

  22. CRT Monitors • CRT stands for Cathode-ray tube (large, sealed glass tube) • Originally curved screens; modern day uses flat screens (more ergonomic) • Produce a small amount of electromagnetic radiation • Issue 6-1, pg 297 • http://www.webopedia.com/TERM/C/CRT.html COMP 6005 An Introduction to Computing - Session Two: Computer Hardware

  23. Flat Panel Display • Device with a shallow depth that does not use CRT technology • Examples: LCD monitors, LCD screens, gas plasma monitors, many HDTVs • Uses liquid crystal display to produce images • Uses less power than CRT and less space • Used in Tablet PCs, notebooks, smart phones, PDAs, e-books • Issue 6-2, pg 299 COMP 6005 An Introduction to Computing - Session Two: Computer Hardware

  24. Flat-panel Display vs Flat Display • Flat-panel display refers to a display with a shallow depth and uses LCD, gas plasma or some other technology • Flat display refers to a CRT monitor that has a flat screen COMP 6005 An Introduction to Computing - Session Two: Computer Hardware

  25. Some Other Output Devices • Printers • Speakers and headsets • Fax machines and fax modems • Multifunction peripherals – act as several different devices in one; printer, fax machine, scanner, copier • Projectors – Looking Ahead 6-2, pg 317 • Force-feedback joysticks and wheels – provides resistance to the user in response to actions taken COMP 6005 An Introduction to Computing - Session Two: Computer Hardware

  26. Printers • Device that produces text and graphics on a physical medium (paper, transparencies, etc) • Figure 6-16, pg 303 • Looking Ahead 6-1, pg 303 • Issue 6-3, pg 306 COMP 6005 An Introduction to Computing - Session Two: Computer Hardware

  27. Dot-matrix Ink-Jet Impact Line Nonimpact Photo Laser Thermal Mobile Label and postage Plotters and large-format Wireless Types of Printers COMP 6005 An Introduction to Computing - Session Two: Computer Hardware

  28. Output Devices For Differently-Abled Users • Hearing-impaired users will have programs display words and no sound • Visually-impaired users can increase size, change colour • Blind users can work with voice output instead of using a monitor – computer reads what is displayed • An alternative for blind users is a Braille printer – information outputted onto paper in Braille COMP 6005 An Introduction to Computing - Session Two: Computer Hardware

  29. Discussion • Issue 6-4, pg 314 • Issue 6-2, pg 299 • Issue 6-5, pg 319 COMP 6005 An Introduction to Computing - Session Two: Computer Hardware

  30. Assignment • Read the Special Feature pg 334-345 • Read Chapter 7 for Class preparation COMP 6005 An Introduction to Computing - Session Two: Computer Hardware

  31. Links • Reference • Discovering Computers 2005 by Shelly, Cashman and Vermaat • Of Interest • http://www.indigoimage.com/count/ • http://www.hp.com/large/ipg/mobileprint.html • http://wearables.cs.bris.ac.uk/index.htm COMP 6005 An Introduction to Computing - Session Two: Computer Hardware

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