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Chapter 5 Input

Chapter 5 Input. Chapter 5 Objectives. Explain how a digital camera works. Define input. Describe uses of PC video cameras, Web cams, and video conferencing. List characteristics of a keyboard. Describe different mouse types and how they work.

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Chapter 5 Input

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  1. Chapter 5Input

  2. Chapter 5 Objectives Explain how a digital camera works Define input Describe uses of PC video cameras,Web cams, and video conferencing List characteristics of a keyboard Describe different mouse typesand how they work Discuss various scanners and reading devices and how they work Summarize how pointing devices work Explain the types of terminals and the purpose of their card readers Explain how voice recognition works Summarize the various biometric devices Describe various input devicesfor mobile users Identify alternative input devices for physically challenged users

  3. WHAT IS INPUT? • Any data or instructions you enter into the memory of a computer • Data - unorganized facts, figures, symbols • Instructions • Programs • Commands • User Responses

  4. THE KEYBOARD • Most commonly used input device • Many features • Many types • Cordless • Built-in • Ergonomic • Portable • Virtual

  5. THE KEYBOARD • What are alternative forms for commands? • Many programs allow you to use key combination, menu, or button to obtain same result

  6. POINTING DEVICES An input device that allows you to control a pointer on the screen • Mechanical Mouse • Optical Mouse • Trackball • Touchpad

  7. POINTING DEVICES • Pointing stick • Joystick • Touch screen

  8. POINTING DEVICES • Pen Input • Light pen • Stylus • Cursor • Electronic signature • Handwriting recognition software

  9. AUDIO INPUT • Voice Input: Speech Recognition • Computer’s capability of distinguishing spoken words • Speaker dependent (user must train the computer) vs speaker independent • Discrete vs continuous speech

  10. AUDIO INPUT • Audio Input • Entering music, speech, or sound effects • Requires a sound card • Uses microphone, tape/CD player, … • MIDI

  11. VIDEO INPUT • Video Input • Entering a full-motion recording into a computer and storing the video on a hard disk or some other medium • Digital video (DV) camera records video as digital signals • PC video camera • Web cam

  12. VIDEO INPUT • Videoconferencing • Meeting between two or more geographically separated individuals who use a network to transmit audio and video data • Whiteboard can display notes and drawing simultaneously on all participants’ screens.

  13. DIGITAL CAMERAS • Allows you to take pictures and store the photographed images digitally • Edit, print, fax, mail, or post on the Web • Images stored various ways: • Floppy disk • PC card • Memory stick • Compact flash disk • The higher the resolution the better the image • More pixels means higher resolution

  14. SCANNERS AND READING DEVICES • Make the input process more efficient by eliminating the manual entry of data • Source document: original paper document • Scanners are used for image processing, converting paper documents into electronic images

  15. SCANNERS AND READING DEVICES • Optical Scanner • Convert an image into a numeric representation: the bitmap • Types of scanners • Handheld • Flatbed • Drum • Sheet-feed

  16. SCANNERS AND READING DEVICES • Optical Readers • Uses light to read characters, marks, and codes • Converts them into digital data that can be processed by a computer

  17. SCANNERS AND READING DEVICES • Optical Readers • Optical character recognition (OCR) • Reads printed characters • OCR software used with scanners • Optical mark recognition (OMR) • Reads hand-drawn marks • Bar code scanner

  18. SCANNERS AND READING DEVICES • Magnetic Ink Character Recognition (MICR) Reader • Preprinted on checks - bank code, account number, and check number

  19. SCANNERS AND READING DEVICES • Data collection devices • Used to obtain data directly at the location where the transaction or event takes place

  20. TERMINALS • Performs both input and output • Components: monitor, keyboard, video card • Special purpose terminals: • Point-of-sale (POS) terminal • Card reader reads customer’s data from magnetic strip • Automatic teller machine (ATM) • Connects to host computer through network

  21. TERMINALS • Smart display • Thin monitor that detaches from computer to function as portable wireless touch screen

  22. BIOMETRIC INPUT • Biometrics authenticates a person’s identity by verifying personal characteristics. • Fingerprint scanners • Face recognition system • Voice verification system • Signature verification system • Iris recognition system

  23. INPUT DEVICES FOR THE PHYSICALLY CHALLENGED • Americans with Disabilities Act (ADA) requires company to make reasonable attempts to accommodate the needs of physically challenged workers.

  24. Chapter 5 Complete

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