Itc lec 8 discovering computer..input devices
0 likes61 views
The document discusses input devices, which are hardware components used to enter data or instructions into a computer. It covers various types of input devices, including keyboards, mice, trackballs, touchpads, joysticks, and voice recognition, explaining their functions and uses. Additionally, it outlines the operation of these devices, including commands and alternatives like keyboard shortcuts.
Itc lec 8 discovering computer..input devices
- 2. What is input? p. 230 and 232 Fig. 5-1 Next Input device is any hardware component used to enter data or instructions Data or instructions entered into memory of computer
- 3. What are the two types of input? p. 230 Fig. 5-2 Next Unprocessed text, numbers, images, audio, and video Instructions Programs Commands User responses Data
- 4. How is the keyboard divided? p. 232 Fig. 5-3 Next Typing area Numeric keypad Function keys, special keys that issue commands
- 5. What are alternative forms for commands? p. 233 Fig. 5-4 Next MICROSOFT WORD KEY COMBINATION EQUIVALENTS Key Menu | Command Combination Command Button Copy Shift+F2 or Edit | Copy Ctrl+C Open Ctrl+F12 File | Open Paste Ctrl+V Edit | Paste Many programs allow you to use key combination, menu, or button to obtain same result
- 6. What is the insertion point? p. 233 Fig. 5-5 Next Blinking vertical bar that indicates where next character you type will display Pointer changes location and shape as you move mouse or other pointing device
- 7. What is a cordless keyboard? p. 234 Fig. 5-6 Next Communicate with a receiver attached to a port on the system unit
- 8. What are other types of keyboards? p. 234 Fig. 5-7 Next Notebook and many handheld computers have built-in keyboards
- 9. What is a mouse? Next 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 mouse buttons wheel button mouse pad ball
- 10. What is an optical mouse? p. 235 Fig. 5-9 Next No moving mechanical parts inside Senses light to detect mouse’s movement (performance depends on laser sensitivity) More precise than mechanical mouse Connects using a cable, or wireless
- 12. How do you use a mouse? p. 236 Fig. 5-10 Next Step 1. Place the mouse toward the right of the mouse pad. Step 2. Move the mouse diagonally toward the left until the pointer is positioned on the Microsoft Outlook icon. As you move mouse, pointer on screen moves
- 13. Press wheel button Right- click Double- click What are common mouse operations? p. 237 Next Point Click Drag Rotate wheel
- 14. What is a trackball? p. 238 Fig. 5-12 Next Stationary pointing device with a ball on its top To move pointer, rotate ball with thumb, fingers, or palm of hand
- 15. What are a touchpad and a pointing stick? p. 238 Figs. 5-13—5-14 Next 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
- 16. What are a joystick and a wheel? p. 239 Fig. 5-15 Next Joystick is vertical lever mounted on a base Wheel is steering-wheel-type input device Pedal simulates car brakes and accelerator
- 17. What is a light pen? p. 239 Fig. 5-16 Next Handheld input device that can detect light Press light pen against screen surface and then press button on pen
- 18. What is a touch screen? p. 240 Fig. 5-17 Next Touch areas of screen with finger Often used with kiosks
- 20. What is a stylus? p. 240 Fig. 5-18 Next Looks like a ballpoint pen, but uses pressure to write text and draw lines Used with graphics tablets, flat electronic boards
- 21. Where is a stylus used? p. 240 Fig. 5-19 Next Some desktop computers Many mobile computers and devices Handwriting recognition software translates handwriting into characters that computer can process
- 22. How does voice recognition work? p. 242 Fig. 5-20 Next 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. 10010111010110101100001101 Step 3. Software compares spoken measurements with those in its database to find a match or list of possible matches. Matches 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. Natural Language Engine Step 1. A user dictates text into a microphone.
- 23. What is a MIDI (musical instrument digital interface)? p. 243 Fig. 5-21 Next External device, such as electronic piano keyboard, to input music and sound effects