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Chapter 5 Input

Chapter 5 Input. Chapter 5 Objectives. Keyboard Pointing devices Voice input Digital cameras Video input Scanners and reading devices Terminals Biometric input. What Is Input?. Next. What is input ?. Data or instructions entered into memory of computer.

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Chapter 5 Input

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  1. Chapter 5Input

  2. Chapter 5 Objectives • Keyboard • Pointing devices • Voice input • Digital cameras • Video input • Scanners and reading devices • Terminals • Biometric input

  3. What Is Input? Next • What isinput? • Data or instructions entered into memory of computer • Input device is any hardware component that allows users to enter data and instructions p. 234 and 236 Fig. 5-1

  4. What Is Input? Next • What are the two types of input? • Data • Unprocessed text, numbers, images, audio, and video • Instructions • Programs • Commands • User responses p. 234

  5. The Keyboard Next • How is the keyboard divided? • Typing area • Numeric keypad • Function keys, special keys that issue commands (e.g, toggle key, WINDOWS key, APPLICATION key p. 236 Fig. 5-2

  6. The Keyboard Next • What is acordless keyboard? • Communicate with a receiver attached to a port on the system unit p. 238 Fig. 5-4

  7. Pointing Devices mouse buttons wheel button ball Click to view Web Link,click Chapter 5, Click Web Linkfrom left navigation, then click Mouse below Chapter 5 mouse pad Next • What is amouse? • Pointing device that fits under palm of hand • Pointing device controls movement of pointer, also called mouse pointer • Mechanical mouse has rubber or metal ball on underside p. 239 Fig. 5-5

  8. Pointing Devices Next • What is anoptical mouse? • No moving mechanical parts inside • Senses light to detect mouse’s movement • More precise than mechanical mouse • Connects using a cable, or wireless p. 239 Fig. 5-6

  9. Other Pointing Devices Next • 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 p. 241 Fig. 5-8

  10. Other Pointing Devices Click to view Web Link,click Chapter 5, Click Web Linkfrom left navigation, then click Touchpad or Pointing Stick below Chapter 5 Next • What are atouchpadand apointing stick? • Touchpadis small, flat, rectangular pointing device sensitive to pressure and motion • Pointing stickis pointing device shaped like pencil eraser positioned between keys on keyboard p. 241 - 242 Figs. 5-9—5-10

  11. Other Pointing Devices Next • What are ajoystickand awheel? • Joystickis vertical lever mounted on a base • Wheelis steering-wheel-type input device • Pedal simulates car brakes and accelerator p. 242 Fig. 5-11

  12. Other Pointing Devices Next • What is alight pen? • Handheld input device that can detect light • Press light pen against screen surface and then press button on pen p. 242 Fig. 5-12

  13. Other Pointing Devices Click to view Web Link,click Chapter 5, Click Web Linkfrom left navigation, then click Touch Screen below Chapter 5 Next • What is atouch screen? • Touch areas of screen with finger • Often used with kiosks p. 243 Fig. 5-13

  14. Keyboard and Pointing Devices Click to view Web Link,click Chapter 5, Click Web Linkfrom left navigation, then click Pen Inputbelow Chapter 5 Next • What is astylus and a digital pen? • Looks like a ballpoint pen, but uses pressure to write text and draw lines • Used withgraphics tablets, flat electronic boards p. 243 Fig. 5-14 and 5-15

  15. Voice Input Step 1. A user dictates text into a microphone. 10010111010110101100001101 Step 4. To narrow a list down, software presents user with a list of choices or uses a natural language component to predict most likely match. User may correct any selection made by software. Step 3. Software compares spoken measurements with those in its database to find a match or list of possible matches. Natural Language Engine Matches Click to view Web Link,click Chapter 5, Click Web Linkfrom left navigation, then click Voice Input below Chapter 5 Next • How does voice recognition work? Step 2. An analog-to-digital converter (ADC) translates sound waves into digital measurements computer can process. Measurements include pitch, volume, silences, and phonemes. Phonemes are sound units such as aw and guh. p. 246

  16. Voice Input Next • What is aMIDI (musical instrument digital interface)? • External device, such as electronic piano keyboard, to input music and sound effects p. 246 Fig. 5-19

  17. PDAs, Tablet PCs, and Smart Phones Next • How is a data entered into a PDA? p. 247 Fig. 5-20

  18. PDAs, Tablet PCs, and Smart Phones Next • What is aTablet PC? • Mobile computer that includes handwriting recognition software • Primary input device is a pressure-sensitive digital pen p. 249 Fig. 5-23

  19. Digital Cameras Next • What is adigital camera? • Allows you to take digital pictures • Images viewable immediately on camera • Download to computer • Post pictures to Web p. 250 Fig. 5-24

  20. Digital Cameras Next • What isresolution? • Sharpness and clarity of image • The higher the resolution, the better the image quality, but the more expensive the camera • Pixel(pictureelement) is single point in electronic image • Greater the number of pixels, the better the image quality p. 252 Fig. 5-26

  21. Video Input Next • What isvideo input? • Process of entering full-motion images into computer • Video capture cardis adapter card that converts analog video signal into digital signal that computer can use • Digital video (DV) camerarecords video as digital signals p. 253 Fig. 5-27

  22. Video Input Next • What are aPC video cameraand aWeb cam? • PC video camerac—cDV camera used to capture video and still images, and to make video telephone calls on Internet • Also called PC camera • Web camc—cvideo camera whose output displays on a Web page • CharlotteWeb Cams p. 253 Fig. 5-28

  23. Video Input Next • What isvideo conferencing? • Two or more geographically separated people who use network or Internet to transmit audio and video data • Whiteboard is another window on screen that can display notes and drawings simultaneously on all participants’ screens p. 254 Fig. 5-29

  24. Scanners and Reading Devices Flatbed Pen or Handheld Sheet-fed Drum Click to view Web Link,click Chapter 5, Click Web Linkfrom left navigation, then click Scanners below Chapter 5 Next • What is ascanner? • Light-sensing device that reads printed text and graphics • Used for image processing, converting paper documents into electronic images p. 255 Fig. 5-30

  25. Scanners and Reading Devices Next • 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 p. 257 Fig. 5-32

  26. Scanners and Reading Devices Next • What is aturnaround document? • Document that you return to the company that sent it • Portion you return has information printed in OCR characters p. 257 Fig. 5-33

  27. Scanners and Reading Devices Next • What is abar code reader? • Uses laser beams to read bar codes p. 258 Fig. 5-34

  28. Scanners and Reading Devices Next What is amagnetic-ink character recognition (MICR) reader? • Can read text printed with magnetized ink • Banking industry almost exclusively uses MICR for check processing p. 260 Fig. 5-38

  29. Other Input Devices Next • What is anRFID reader? • Reads information on the tag via radio waves • Can be handheld devices or mounted in a stationary object p. 259 Fig. 5-36

  30. Other Input Devices Next • 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 p. 260 Fig. 5-37

  31. Terminals Next • What is apoint of sale(POS) terminal? • Records purchases, processes credit or debit cards, and updates inventory • Swipe credit or debit card through card reader • Reads customer’s personal data from magnetic strip p. 261 Fig. 5-40

  32. Biometric Input Click to view Web Link,click Chapter 5, Click Web Linkfrom left navigation, then click Biometric Input below Chapter 5 Next • What isbiometrics? • Authenticates person’s identity by verifying personal characteristic • Fingerprint scanner captures curves and indentations of fingerprint • Hand geometry system measures shape and size of person’s hand p. 262 Fig. 5-42 and 5-43

  33. Biometric Input Next • What are examples of biometric technology? • Gesture recognition systems detect human motions • Signature verification system recognizes shape of signature • Iris recognition systemreads 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 p. 263 Figs. 5-44—5-45

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