Chapter 5Input
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
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
The Keyboard Next • How is the keyboard divided? • Typing area • Numeric keypad • Function keys, special keys that issue commands p. 236 Fig. 5-2
The Keyboard Next • What is theinsertion point? • Blinking vertical bar that indicates where next character you type will display • Pointerchanges location and shape as you move mouse or other pointing device p. 237 Fig. 5-3
The Keyboard Next • What is acordless keyboard? • Communicate with a receiver attached to a port on the system unit p. 238 Fig. 5-4
Pointing Devices mouse buttons wheel button ball 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
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
Pointing Devices Double-click Triple-click Right-click Right-drag Tiltwheel Presswheel button Next • What are common mouse operations? Point Click Drag Rotate wheel p. 240 Fig. 5-7
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
Other Pointing Devices 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
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
Other Pointing Devices Next • What is acontrol padand agamepad? • Control padon an audio player allows users to scroll through music, adjust volume, and customize settings • Gamepada pointing device that controls the movement and actions of players or objects in games p. 242 Fig. 5-12
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
Other Pointing Devices Next • What is atouch screen? • Touch areas of screen with finger • Often used with kiosks p. 243 Fig. 5-13
Keyboard and Pointing Devices 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 - 244 Fig. 5-14 and 5-15
Voice Input Next • How does voice recognition work? p. 245 Fig. 5-18
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
PDAs, Tablet PCs, and Smart Phones Next • How is data entered into a PDA? p. 247 Fig. 5-20
PDAs, Tablet PCs, and Smart Phones Next • What is aportable keyboard and a docking station? • A portable keyboard is a full-sized keyboard you conveniently attach to and remove from PDA • A docking station is an external device that holds a mobile computer p. 248 Fig. 5-21
PDAs, Tablet PCs, and Smart Phones Next • What is asmart phone? • Users can input and send text messages, graphics, pictures, video clips, and sound files • Many have a built-in or attachable camera p. 248 - 249 Fig. 5-22
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 – 250 Fig. 5-23
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
Digital Cameras Next • How does a digital camera work? p. 251 Fig. 5-25
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
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
Video Input Next • What is aPC video cameraand aWeb cam? • PC video camerac—cdigital video 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 p. 253 Fig. 5-28
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
Scanners and Reading Devices Flatbed Pen or Handheld Sheet-fed Drum 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
Scanners and Reading Devices Step 1: Place the document to be scanned face down on the glass window. Using buttons on the scanner or the scanner program, start the scanning process. Step 2: The scanner converts the document content to digital information, which is transmitted through the cable to the memory of the computer. Step 3: Once in the memory of the computer, users can display the image, print it, e-mail it, include it in a document, or place it on a Web page. Next • How does aflatbed scannerwork? p. 256 Fig. 5-31
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
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
Scanners and Reading Devices Next • What is abar code reader? • Uses laser beams to read bar codes p. 258 Fig. 5-34
Scanners and Reading Devices Next • What is abar code? • Identification code that consists of a set of vertical lines and spaces of different widths • UniversalProductCode(UPC) p. 258 Fig. 5-35
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
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
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
Scanners and Reading Devices Next • What is adata collection device? • Obtains data directly at location where transaction or event takes place • Transmits data over network or Internet p. 261 Fig. 5-39
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 - 262 Fig. 5-40
Terminals Next • What is anautomated teller machine (ATM)? • Self-service banking machine that connects to a host computer through a network p. 262 Fig. 5-41
Biometric Input 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
Biometric Input Next • 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 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 – 264 Figs. 5-44—5-45
Input Devices for Physically Challenged Users Next • What input devices are available for those with physical limitations? • Keyguardallows users to rest hands on keyboard without accidentally pressing keys • Head-mounted pointer controls pointer on screen • New developments includegesture recognition and computerized implant devices p. 266 Figs. 5-47
