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7. CHAPTER. INPUT AND OUTPUT. Competencies. Define input Describe keyboard entry, pointing devices, & scanning devices Discuss image capturing devices, digitizing devices, & audio input devices. Competencies cont. Define output Describe monitors, printers, and audio output devices

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  1. 7 CHAPTER INPUT AND OUTPUT

  2. Competencies • Define input • Describe keyboard entry, pointing devices, & scanning devices • Discuss image capturing devices, digitizing devices, & audio input devices

  3. Competenciescont. • Define output • Describe monitors, printers, and audio output devices • Discuss combination input & output devices

  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

  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

  6. Traditional Keyboard

  7. Pointing Devices • Mouse • Mechanical • Optical • Cordless or wireless • Joystick • Touch Screen • Light Pen

  8. Scanning Devices • Optical scanners • Flatbed • Portable • Bar code readers • Handheld wand readers or platform scanners • Contain photoelectric cells that read bar codes

  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)

  10. 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

  11. Digitizing Devices • Graphics Tablets • Digital Notepads

  12. Audio Input Devices • Voice • Voice recognition systems • Discrete-speech recognition systems • Continuous-speech recognition system • Music • Musical Interface Digital Interface (MIDI)

  13. What is Output? • Processed data or information • Types of output • Text • Graphics • Audio & video • Output devices • Monitors • Printers

  14. Monitors • Known as screens or display screens • Output referred to as soft copy • Features • Resolution • Dot pitch • Refresh rate • Size

  15. computing ESSENTIALS    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

  16. computing ESSENTIALS    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)

  17. computing ESSENTIALS    Monitor Types • Cathode-Ray Tubes (CRT) • Most common • Flat-panel monitors • Passive-matrix • Active-matrix • eBook readers • Data projectors • High-definition television (HDTV)

  18. Printers • Translates information that has been processed by the system unit • Output referred to as hard copy • Features • Resolution • Color capability • Speed • Memory

  19. Printers • Ink-jet printer • Laser printer • Personal laser printers • Shared laser printers • Thermal printer • Other printers • Dot-matrix • Plotters • Photo printers

  20. Audio Output Devices • Translates audio information into sounds that people can understand • Common devices • Speakers • Headphones

  21. Combination Input and Output Devices • Fax machines • Multifunction devices • Internet telephones • Telephony • Voice-over IP (VoIP) • Terminals

  22. Terminals • An input and output device • Connects to a mainframe or server • Types of terminals • Dumb terminal • Intelligent terminal • Network terminal • Internet terminal

  23. A Look to the FutureNeural Signals Inc. • Brain machine interface • Allows humans to control machines with their thoughts • Individuals incapable of communication • Physically immobile people

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