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Chapter 5 Input and Output

Chapter 5 Input and Output. Chapter 5 Objectives. List the characteristics of a keyboard. Describe the characteristics of LCD monitors, LCD screens, and CRT monitors.

nadine-beasley
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Chapter 5 Input and Output

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  1. Chapter 5Input and Output

  2. Chapter 5 Objectives List the characteristicsof a keyboard Describe the characteristics of LCD monitors, LCD screens, and CRT monitors Summarize how these pointing deviceswork: mouse, trackball, touchpad, pointing stick, joystick, wheel, audio player, control pad, gamepad, light pen, touch screen, stylus, and digital pen Summarize the various types of printers Explain the characteristics of speakers, headphones and earphones; fax machines and fax modems, multifunction peripherals, and data projectors Describe other types of input, including voice input; input devices for PDAs, smart phones, and Tablet PCs; digital cameras; voice input; scanners and reading devices; terminals; and biometric input Identify input and output options for physically challenged users

  3. What Is Input? • What isinput? • Data or instructions entered into the memory of computer • Input device is any hardware component used to enter data or instructions into a computer

  4. Keyboard and Pointing Devices • What is a keyboard? • Input device that contains keys users press to enter data into a computer • Includes typing area, numeric keypad, and function keys • Can be cordless or built-in

  5. mouse buttons wheel button ball mouse pad Keyboard and Pointing Devices • What is amouse? • Pointing device that fits under the palm of your hand • Mechanical mouse has rubber or metal ball on its underside

  6. Keyboard and Pointing Devices • What is anoptical mouse? • No moving mechanical parts inside • Senses light to detect mouse’s movement • More precise than mechanical mouse • More expensive than a mechanical mouse

  7. Keyboard and Pointing Devices • What is atrackball? • Stationary pointing device with a ball on its top or side • To move pointer, rotate ball with thumb, fingers, or palm of hand

  8. Keyboard and Pointing Devices • What are atouchpadand apointing stick? • Touchpad is small, flat, rectangular pointing device sensitive to pressure and motion • Pointing stick is pointing device shaped like pencil eraser positioned between keys on keyboard

  9. Keyboard and Pointing Devices • What are ajoystickand awheel? • Joystick is vertical lever mounted on a base • Wheel is steering-wheel-type input device • Pedal simulates car brakes and accelerator

  10. Other Pointing Devices • What is acontrol padand agamepad? • Control pad on an audio player allows users to scroll through music, adjust volume, and customize settings • Gamepad a pointing device that controls the movement and actions of players or objects in games

  11. Keyboard and Pointing Devices • What is atouch screen? • Touch areas of screen with finger • Often used with kiosks

  12. Keyboard and Pointing Devices • What is astylus and a digital pen? • Used with graphics tablets, flat electronic boards • Looks like a ballpoint pen, but uses pressure to write text and draw lines

  13. Other Input Devices • What is voice input? • Entering data by speaking into a microphone • Voice recognition or speech recognition is thecomputer’s capability to distinguish spoken words

  14. Other Input Devices • What is audio input? • Entering sounds into a computer - speech,music, and sound effects • MIDI - standard defining how digital musicaldevices represent sound electronically

  15. PDAs, Tablet PCs, and Smart Phones • What is aTablet PC? • Mobile computer that includes handwriting recognition software • Primary input device is a pressure-sensitive digital pen

  16. Other Input Devices • What is adigital camera? • Allows you to take digital pictures • Images viewable immediately on camera • Download to computer • Post pictures to Web

  17. Other Input Devices • What isresolution? • Sharpness and clarity of image • The higher the resolution, the better the image quality, but the more expensive the camera • Pixel (picture element) is single point in electronic image • Greater the number of pixels, the better the image quality

  18. Other Input Devices • What isvideo input? • Process of storing full-motion images on a computer’s storage medium • Digital video (DV) camera records video as digital signals

  19. Other Input Devices • What is aPC video cameraand aWeb cam? • PC video camera—DV camera used to capture video and still images, and to make video telephone calls on Internet • Also called PC camera • Web cam—video camera that displays its output on a Web page

  20. Other Input Devices • What isvideo conferencing? • Two or more geographically separated people who use network on Internet to transmit audio and video data

  21. Other Input Devices • What is ascanner? • Light-sensing device that reads printed text and graphics • Used for image processing, converting paper documents into electronic images

  22. Other Input Devices • What is anoptical reader? • Device that uses light source to read characters, marks, and codes and then converts them into digital data • Optical character recognition (OCR) reads characters in OCR font • Optical mark recognition (OMR) reads hand-drawn pencil marks, such as small circles • Bar code reader

  23. Other Input Devices • What is anRFID reader? • Reads information on the tag via radio waves • Can be handheld devices or mounted in a stationary object

  24. Other Input Devices • What is amagnetic stripe card reader? • Reads the magnetic stripe on the back of a credit card • Exposure to a magnetic field can erase the contents of a card’s magnetic stripe

  25. Other Input Devices What is a magnetic-ink character recognition (MICR) reader? • Can read text printed with magnetized ink • Banking industry almost exclusively uses MICR for check processing

  26. Other Input Devices • What is apoint of sale (POS) terminal? • Records purchases, processes credit or debit cards, and updates inventory

  27. Other Input Devices • What is anautomated teller machine (ATM)? • Self-service banking machine that connects to a host computer through a network

  28. Other Input Devices • What isbiometrics? • Authenticates person’s identity by verifying a personal characteristic • Fingerprint scanner captures curves and indentations of fingerprint

  29. Other Input Devices • What are examples of biometric technology? • Voice verification system compares live speech with stored voice pattern • Signature verification system recognizes shape of signature • Iris recognition system reads patterns in blood vessels in back of eye • Biometric data is sometimes stored on smart card, which stores personal data on microprocessor embedded in card

  30. What is Output? • Data that has been processed into a useful form,called information • What isoutput? • Output device is any hardware component that can convey information to one or more people

  31. Display Devices • What is adisplay device? • Output device that visually conveys information • Information on display device sometimes called soft copy • Monitor houses display device as separate peripheral

  32. Display Devices • What is an LCD monitor? • Uses liquid crystal display • Have a small footprint • Mobile devices that contain LCD displays include • Notebook computer, Tablet PC, PDA, and Smart Phone

  33. Display Devices • What is aplasma monitor? • Displays image by applying voltage to layer of gas • Larger screen size and higher display quality than LCD, but are more expensive

  34. Display Devices • What is aCRT monitor? • Contains cathode-ray tube (CRT) • Common sizes are 15, 17, 19, 21, and 22 inches • Viewable size is diagonal measurement of actual viewing area

  35. Display Devices • What determines the quality of a CRT monitor? • Screen resolution • Text created with a smaller dot pitch is easierto read • Refresh rate is speed at which monitor redrawsimages on screen

  36. wirelessprinters printercable cable dockingstation mediacard Printers • Output device that produces text and graphics on a physical medium various ways to print

  37. Printers • What is anonimpact printer? • Forms characters and graphics without striking paper • Ink-jet printer sprays tiny drops of liquid ink onto paper • Prints in black-and-white or color on a variety of paper types

  38. Printers • What is aphoto printer? • Color printer that produces photo-lab-quality pictures • Many photo printers have a built-in card slot

  39. Printers • What is alaser printer? • High-speed, high-quality nonimpact printer • Prints text and graphics in very high-quality resolution, ranging from 1,200 to 2,400 dpi • Typically costs more than ink-jet printer, but is much faster

  40. Printers • What is athermal printer? • Generates images by pushing electrically heated pins against heat-sensitive paper • Dye-sublimation printer, (also called a digital photo printer) uses heat to transfer dye to specially coated paper

  41. Printers • What is amobile printer? • Small, lightweight, battery-powered printer that allows mobile user to print from notebook computer, Tablet PC, PDA, or smart phone while traveling

  42. Printers • What is aplotter? • Sophisticated printer used to produce high-quality drawings • Large-format printer creates photo-realistic-qualitycolor prints

  43. Printers • What is animpact printer? • Forms characters by striking mechanism against inked ribbon that contacts paper • Dot-matrix printer producesprinted images when tiny wire pins strike ribbon • Line printer prints entire lineat a time

  44. Other Output Devices • What is anaudio output device? • Computer component that produces music, speech, or other sounds • Speakers, earphones, and ear buds are common devices

  45. Other Output Devices • What is voice output? • Computer talks to you through speakers on computer • Internet telephony allows you to have conversationover Web • What is a facsimile (fax) machine? • Device that transmits and receives documents over telephone lines What is a fax modem? • Modem that allows you to send and receive electronic documents as faxes

  46. Other Output Devices • What is amultifunction peripheral? • Provides functionality of printer, scanner, copy machine, and fax machine

  47. Other Output Devices • What is a data projector? • Device that takes image from computer screen and projects it onto larger screen

  48. Input and Output Devices for Physically Challenged Users What input devices are available for those with physical limitations? • Keyboards with larger keys • Head-mounted pointer controls pointer on screen

  49. Input and Output Devices for Physically Challenged Users What other output options are available for visually impaired users? • Change Window settings, such as increasing size or changing color of text to make words easier to read • Blind users can work with voice output • Braille printeroutputs information in Braille onto paper

  50. Summary of Input and Output Data and instructions Processing and organizinginput into output Various techniques of input Various methods of output Commonly used input devices Commonly used output devices

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