Understanding Input & Output - Discovering Computers PDF

Chapter Three (1) Understanding Input & Output Discovering Computers Your Interactive Guide to the Digital World What Is Input? Input is any data and instructions entered into the memory of a computer Pages 258 – 259 2...

Chapter Three (1) Understanding Input & Output Discovering Computers Your Interactive Guide to the Digital World What Is Input? Input is any data and instructions entered into the memory of a computer Pages 258 – 259 2 Discovering Computers : Chapter 5 Figure 5-1 What Are Input Devices An input device is any hardware component that allows users to enter data and instructions into a computer Page 260 3 Discovering Computers : Chapter 5 The Keyboard A keyboard is an input device that contains keys users press to enter data and instructions into a computer Page 260 4 Discovering Computers : Chapter 5 Figure 5-2 The Keyboard Most desktop computer keyboards have… Pages 260 - 261 5 Discovering Computers : Chapter 5 The Keyboard Wired Wireless Keyboards Keyboards USB port Bluetooth IrDA Page 262 6 Discovering Computers : Chapter 5 The Keyboard An ergonomic keyboard has a design that reduces the chance of wrist and hand injuries Ergonomics incorporates comfort, efficiency, and safety into the design of the workplace Page 262 7 Discovering Computers : Chapter 5 Figure 5-4 The Keyboard Keyboards on mobile devices typically are smaller and/or have fewer keys Some phones have predictive text input, which saves time when entering text using the phone’s keypad Pages 262 – 263 8 Discovering Computers : Chapter 5 Figure 5-5 Pointing Devices Page 263 9 Discovering Computers : Chapter 5 Mouse A mouse is a pointing device that fits under the palm of your hand comfortably – Most widely used pointing device on desktop computers A mouse can be wired or wireless Pages 263 – 264 10 Discovering Computers : Chapter 5 Figures 5-6 and 5-7 Mouse Mouse operations Point Click Right-click Double-click Rotate Triple-click Drag Right-drag wheel Free-spin Press thumb Press wheel Tilt wheel wheel button Page 264 11 Discovering Computers : Chapter 5 Figure 5-8 Other Pointing Devices Trackball Touchpad Pointing Stick A trackball is a A touchpad is A pointing stationary a small, flat, stick is a pointing rectangular pressure- device with a pointing sensitive ball on its top device that is pointing or side sensitive to device shaped pressure and like a pencil motion eraser that is positioned between keys on a keyboard Pages 265 – 266 12 Figures 5-9 – 5-11 Discovering Computers : Chapter 5 Touch Screens and Touch-Sensitive Pads A touch screen is a touch-sensitive display device Page 266 13 Figures 5-12 – 5-13 Discovering Computers : Chapter 5 Touch Screens and Touch-Sensitive Pads Microsoft Surface Touch-sensitive pads Page 267 14 Discovering Computers : Chapter 5 Figures 5-14 – 5-15 Pen Input With pen input, you touch a stylus or digital pen on a flat surface to write, draw, or make selections Page 268 15 Discovering Computers : Chapter 5 Figure 5-16 Other Input for Smart Phones Page 269 16 Discovering Computers : Chapter 5 Figures 5-17 – 5-18 Game Controllers Video games and computer games use a game controller as the input device that directs movements and actions of on-screen objects Joysticks and Gamepads Light guns Wheels Motion- Dance pads sensing controllers Pages 270 - 271 17 Discovering Computers : Chapter 5 Game Controllers Page 270 18 Discovering Computers : Chapter 5 Figure 5-19 Digital Cameras A digital camera is a mobile device that allows users to take pictures and store them digitally Studio cameras Field cameras Point-and-shoot camera Page 272 19 Discovering Computers : Chapter 5 Digital Cameras Page 272 20 Discovering Computers : Chapter 5 Figure 5-20 Digital Cameras Two factors affect the quality of digital camera photos: Resolution is the number of horizontal and vertical pixels in a display device Resolution A pixel is the smallest element in an electronic display Number of bits Each pixel consists of one or more bits of data stored in each The more bits used to represent a pixel, the more colors and shades of gray that pixel can be represented Page 273 21 Discovering Computers : Chapter 5 Voice Input Voice input is the process of entering input by speaking into a microphone Voice recognition is the computer’s capability of distinguishing spoken words Page 274 22 Discovering Computers : Chapter 5 Figure 5-22 Voice Input Audio input is the process of entering any sound into the computer Speech Music Sound Effects Page 274 23 Discovering Computers : Chapter 5 Video Input Video input is the process of capturing full-motion images and storing them on a computer’s storage medium Record video on a digital video (DV) camera or use a video capture card to convert analog signals to digital Connect the camera to a port on the system unit Transfer video and images Page 275 24 Discovering Computers : Chapter 5 Video Input Page 275 25 Discovering Computers : Chapter 5 Figure 5-24 Video Input A Web cam is a type of digital video camera that enables a user to: Send e-mail Capture video and Add live images to messages with still images instant messages video attachments Broadcast live Make video images over the telephone calls Internet Pages 275 - 276 26 Discovering Computers : Chapter 5 Video Input A video conference is a meeting between two or more geographically separated people Pages 276 – 277 27 Discovering Computers : Chapter 5 Figures 5-25 – 5-26 Scanners and Reading Devices Flatbed Pen or Handheld Sheet-fed Drum Page 277 28 Discovering Computers : Chapter 5 Figure 5-27 Scanners and Reading Devices Page 278 29 Discovering Computers : Chapter 5 Figure 5-28 Scanners and Reading Devices Optical character recognition (OCR) involves reading characters from ordinary documents A turnaround document is a document you return to the company that creates and sends it Page 279 30 Discovering Computers : Chapter 5 Figures 5-29 – 5-30 Scanners and Reading Devices Optical mark recognition (OMR) reads hand-drawn marks such as small circles or rectangles An OMR device scans the documents and matches the patterns of light Page 279 31 Discovering Computers : Chapter 5 Figure 5-31 Scanners and Reading Devices A bar code reader, also called a bar code scanner uses laser beams to read bar codes Page 280 32 Discovering Computers : Chapter 5 Figure 5-32 Scanners and Reading Devices RFID (radio frequency identification) uses radio signals to communicate with a tag placed in or attached to an object An RFID reader reads information on the tag via radio waves RFID can track: Tracking times of Tracking location Employee Checking lift runners in a Airline baggage of soldiers wardrobes tickets of skiers marathon Gauging pressure Managing Checking out Tracking toll and temperature inventory library books payments of tires Page 280 33 Discovering Computers : Chapter 5 Scanners and Reading Devices Magnetic stripe card readers read the magnetic stripe on the back of cards such as: Credit cards Entertainment cards Bank cards Other similar cards Page 281 34 Discovering Computers : Chapter 5 Figure 5-34 Scanners and Reading Devices MICR (magnetic ink character recognition) devices read text printed with magnetized ink An MICR reader converts MICR characters into a form the computer can process Banking industry uses MICR for check processing Page 281 35 Discovering Computers : Chapter 5 Figure 5-35 Biometric Input Biometrics authenticates a person’s identity by verifying a personal characteristic Face Hand Fingerprint recognition geometry reader system system Voice Signature Iris recognition verification verification system system system Retinal scanners Pages 282 - 283 36 Discovering Computers : Chapter 5 Biometric Input hand geometry system iris recognition system fingerprint reader Pages 282 – 283 37 Figures 5-37 – 5-39 Discovering Computers : Chapter 5 Terminals A terminal is a computer that allows users to send data to and/or receive information from a host computer A POS terminal An automated A DVD kiosk is a records purchases, teller machine self-service DVD processes (ATM) allows users rental machine payment, and to access their updates inventory bank accounts Pages 284 – 285 38 Figures 5-40 – 5-42 Discovering Computers : Chapter 5 Input Devices for Physically Challenged Users Several input devices are available to assist physically challenged users: Keyboards Various On-screen Keyguard with larger pointing keyboard keys devices Head- Computerized Gesture mounted implant recognition pointer devices Page 286 39 Discovering Computers : Chapter 5 Input Devices for Physically Challenged Users Keyboard with larger keys Head-mounted pointer Page 286 40 Discovering Computers : Chapter 5 Figures 5-44 – 5-45