I/O Architecture and devices
MELJUN CORTESMELJUN CORTES
Input Devices
• Converts data that can be understood by
humans such as mouse movement into a data
format (0 and 1 combinat...
Output Devices
• Convert the data processed in the computer (0s
and 1s) into data that can be understood by
humans (charac...
Input Devices
What are Input Devices?
• Any hardware component that allows you to
enter data, programs, commands, and user
responses int...
The Keyboard
• Primary input device
• Typical Keyboard:
– Typing area
– Numeric keypad
– Status lights
– Arrow keys
– Func...
Function Keys
Special Keys
The Keyboard
• Keyboard Types
The Keyboard
• Other keyboard types
– Enhanced keyboards
• 12 function keys
• 2 CTRL keys, 2 ALT keys
• A set of arrow and...
Laptop and Handheld Keyboards
• Built into the top of the
system unit
Ergonomic Keyboards
• Used for comfort, efficiency and safety
Pointing Devices
• An input device that allows you to control a
pointer on the screen
– Block arrow
– I-beam
– Pointing ha...
Mouse
• How a mouse works
Using a mouse
Other Pointing Devices
• Trackball
– Like a mouse, but the ball
is on top
– Often used on laptop
computers
• Touchpad
– Fl...
Other Pointing Devices
• Pointing stick
– Pressure sensitive pointing device shaped like a
pencil eraser
– Moves pointer a...
Other Pointing Devices
• Touch screen
– Monitor has a touch-
sensitive panel
– Used to issue simple
commands or choose
fro...
Other Pointing Devices
• Pen input
– Light pen
• Contains light source or can detect light
– Pen computing
• Stylus used
•...
Scanners and Reading Devices
• Optical Scanner
– Result stored as bitmap
– Resolution
– Types of scanners
• Flatbed
• Shee...
Scanners and Reading Devices
• Optical Readers
– Uses light to read characters, marks, and codes
and then converts them in...
Scanners and Reading Devices
– Bar code scanner
• Uses laser beams
• Universal Product Code (UPC)
• Widely used types of b...
Data collection devices
• Used to obtain data directly at the location
where the transaction or event takes place
• Geogra...
Digital Cameras
• Allows you to take pictures and store the
photographed images digitally
– Download, or transfer, picture...
Digital Camera
Audio Input
• Entering music, speech, or
sound effects
• Sound card
• MIDI devices
• Waveforms (WAV files)
• MP3 files (DV...
Audio Input
• Speech Recognition
– Computer’s capability of distinguishing spoken
words
– Speaker dependent/independent sy...
Speech Recognition Applications
Video Input
• Entering a full-motion recording into a
computer and storing the video on a hard
disk or some other medium
•...
Video Input
• Videoconferencing
– Meeting between two or more
geographically separated
individuals who use a network to
tr...
Input devices for physically
challenged users
• Issues that need to be addressed
– Cannot interact with their computer bec...
Input devices for physically
challenged users
• Head-mounted pointers
– Headmaster – electronic pointing device worn
on th...
Input Device Users Guide
MELJUN CORTES Input Output Devices
MELJUN CORTES Input Output Devices
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MELJUN CORTES Input Output Devices

  1. 1. I/O Architecture and devices MELJUN CORTESMELJUN CORTES
  2. 2. Input Devices • Converts data that can be understood by humans such as mouse movement into a data format (0 and 1 combinations) that can be understood by computers and loads it into RAM.
  3. 3. Output Devices • Convert the data processed in the computer (0s and 1s) into data that can be understood by humans (characters, images, video, audio)
  4. 4. Input Devices
  5. 5. What are Input Devices? • Any hardware component that allows you to enter data, programs, commands, and user responses into a computer – Keyboard – Pointing devices – Scanners and reading devices – Optical readers – Digital cameras
  6. 6. The Keyboard • Primary input device • Typical Keyboard: – Typing area – Numeric keypad – Status lights – Arrow keys – Function keys – Special keys • Toggle keys • Ctrl-Alt-Del
  7. 7. Function Keys
  8. 8. Special Keys
  9. 9. The Keyboard • Keyboard Types
  10. 10. The Keyboard • Other keyboard types – Enhanced keyboards • 12 function keys • 2 CTRL keys, 2 ALT keys • A set of arrow and additional keys between the typing area and the numeric keypad – Wireless keyboards • Transmit data via infrared waves – WYSIWYG
  11. 11. Laptop and Handheld Keyboards • Built into the top of the system unit
  12. 12. Ergonomic Keyboards • Used for comfort, efficiency and safety
  13. 13. Pointing Devices • An input device that allows you to control a pointer on the screen – Block arrow – I-beam – Pointing hand
  14. 14. Mouse • How a mouse works
  15. 15. Using a mouse
  16. 16. Other Pointing Devices • Trackball – Like a mouse, but the ball is on top – Often used on laptop computers • Touchpad – Flat, rectangular pointing device that is sensitive to pressure and motion – Often used with laptop computers
  17. 17. Other Pointing Devices • Pointing stick – Pressure sensitive pointing device shaped like a pencil eraser – Moves pointer as pressure is applied – Often used on laptop computers • Joystick – Uses the movement of a vertical lever – Often used with games
  18. 18. Other Pointing Devices • Touch screen – Monitor has a touch- sensitive panel – Used to issue simple commands or choose from a list of options – Kiosks
  19. 19. Other Pointing Devices • Pen input – Light pen • Contains light source or can detect light – Pen computing • Stylus used • Handwriting recognition software – Graphics tablet • Each location on the tablet corresponds to a location on the screen • Puck • Pointing Devices
  20. 20. Scanners and Reading Devices • Optical Scanner – Result stored as bitmap – Resolution – Types of scanners • Flatbed • Sheet-fed • Drum • Business Cards Scanning
  21. 21. Scanners and Reading Devices • Optical Readers – Uses light to read characters, marks, and codes and then converts them into digital data that can be processed by a computer – Optical character recognition (OCR) • Reads character printed in OCR font • Turn-around documents – Optical mark recognition (OMR) • Reads hand-drawn marks
  22. 22. Scanners and Reading Devices – Bar code scanner • Uses laser beams • Universal Product Code (UPC) • Widely used types of bar codes – Magnetic Ink Character Recognition (MICR) Reader • Used in banking industry • Preprinted on cheques - bank code, account number, and cheque number
  23. 23. Data collection devices • Used to obtain data directly at the location where the transaction or event takes place • Geographic information system (GIS)
  24. 24. Digital Cameras • Allows you to take pictures and store the photographed images digitally – Download, or transfer, pictures to your computer – Edit, print, fax, mail, or post on the Web – Studio camera – Field camera – Point-and-shoot camera
  25. 25. Digital Camera
  26. 26. Audio Input • Entering music, speech, or sound effects • Sound card • MIDI devices • Waveforms (WAV files) • MP3 files (DVD Quality) • Voice Input
  27. 27. Audio Input • Speech Recognition – Computer’s capability of distinguishing spoken words – Speaker dependent/independent systems • Voice templates • Discrete speech recognition • Continuous speech recognition • Natural language voice interface
  28. 28. Speech Recognition Applications
  29. 29. Video Input • Entering a full-motion recording into a computer and storing the video on a hard disk or some other medium • Video capture card • Moving Picture Experts Group (MPEG)
  30. 30. Video Input • Videoconferencing – Meeting between two or more geographically separated individuals who use a network to transmit audio and video data – Requires • Microphone • Speakers • Video camera – Whiteboard-based interaction
  31. 31. Input devices for physically challenged users • Issues that need to be addressed – Cannot interact with their computer because of physical, psycho-cognitive, socio-cultural and situational impairments • Australian legislation – Disability Discrimination Act applies to all services whether provided for payment or not • Covers everything from employment and education to sale or rental of real estate to provision of information, services or facilities on the Internet
  32. 32. Input devices for physically challenged users • Head-mounted pointers – Headmaster – electronic pointing device worn on the head and in used in conjunction with a sip and puff switch to emulate clicking – Headmouse – head controlled wireless pointing device • Voice recognition software – Dragon Dictate, Plain Talk • Keyboard – Intellikeys - allows users to touch large or small areas on a keyboard overlay (user designed) to operate a computer • Screen reading software – Windows Accessibility Options
  33. 33. Input Device Users Guide
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