1 / 47

Input- Out put Devices

Input- Out put Devices. Input Data from external world. Result of Processing In human Acceptable form. Input Device. CPU And Memory. Output Device. Processed Data in internal form. Input Data coded internal form.

jketterer
Download Presentation

Input- Out put Devices

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Input- Out put Devices

  2. Input Data from external world Result of Processing In human Acceptable form Input Device CPU And Memory Output Device Processed Data in internal form Input Data coded internal form Illustrating the role I/O devices in a computer system • A computer system can be useful, only when it is able to communicate with its external environment (its users). • As shown in the following figure, the input –output devices provides the means of communication between the computer and the outer world. They are also known as peripheral devices, because they surround the CPU and the memory of a computer system. Afroza Nahar

  3. What Is Input? • Data or instructions entered into memory of computer • Input deviceis any hardware component used to enter data or instructions Afroza Nahar

  4. Page 90 Input Devices Afroza Nahar

  5. What is input? • What are the two types of input? • Data • Unprocessed text, numbers, images, audio, and video • Instructions • Programs • Commands • User responses Afroza Nahar

  6. Input Devices • An input device is an electromechanical device, which accepts data from the outside world, and transferring them into a form, which computer can interpret. • Several input devices are available today. • They can broadly classified into the following categories: • Keyboard Device • Point-and-draw Device • Data scanning devices • Digitizer • Electronic cards based Device • Voice recording Device • Vision based devices Afroza Nahar

  7. Input Devices • Keyboard device : • Keyboard device are the most commonly used input device today. • They allow the data entry into a computer system by pressing a set of keys (labeled buttons) 1/3/2020 • They are nearly mounted on a keyboard, which is connected to the computer system. • The most popular keyboard used today is the 101-keysQWERTY keyboard Afroza Nahar

  8. How is the keyboard divided? • Typing area • Numeric keypad • Function keys, special keys that issue commands Afroza Nahar

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

  10. Input Devices • Point-and-Draw Devices : • Point-and-draw devices are input devices,which can be used to rapidly point to and select a particular graphic icon or menu item from the multiple options displayed on the screen. • Many of this devices can also be very effectively used to create graphic eliminates on the screen, such a s lines, curves, and freehand shape. • Some of the commonly used point-and Draw devices are • Mouse • Trackball • Joystick • Electronic pen • Touch screen. Afroza Nahar

  11. Point-and-Draw Devices • Mouse: • Mouse is the most popular point-and-draw device. • It has became a must-have input device on personal computers and workstations, which have a GUI-based user interface. Afroza Nahar

  12. mouse buttons wheel button ball mouse pad Pointing Devices Afroza Nahar

  13. 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 Afroza Nahar

  14. Double-click Triple-click Right-click Right-drag Presswheel button What are common mouse operations? Point Click Drag Rotate wheel

  15. Trackball • A trackball is pointing device, which is similar to a mouse. As shown in the following figure. • The ball which is placed in the base of a mouse, is placed on the top along with buttons, in case of a trackball. • To move the graphics cursor around the screen, the ball is rolled with the fingers. Afroza Nahar

  16. Trackball • Because the whole device is not moved for moving the graphics cursors, a trackball requires less space than a mouse for operation. • Since it need not be moved for moving the graphics cursors, it is often attached to or built into the keyboard. • Trackballs built into the keyboard are commonly used in laptop computers, because a mouse is not practical for laptop users in a small space. Afroza Nahar

  17. Joystick • A joystick is a pointing device, which works on the same principle as a trackball. • To make the movement of the spherical ball easier, the spherical ball, which moves in a socket, has a stick mounted on it (see the following figures) Afroza Nahar

  18. What isawheel? • Wheelis steering-wheel-type input device • Pedal simulates car brakes and accelerator Afroza Nahar

  19. Electronic Pen • Handheld input device that can detect light • Press light pen against screen surface and then press button on pen Afroza Nahar

  20. Touch Screen • Touch screen is the most simple, intuitive, and easiest to learn of all input devices. • A Touch screen enables the users to choose from available options by simply touching with their fingers the desired icon or menu item displayed icon or menu item displayed on the computer’s screen. • Touch screen are the most preferred human-computer interface devices used in information kiosks. Afroza Nahar

  21. Touch Screen (cont…) • An information kiosks is an unattended system, which is used to store information of public interest, and allows common people to access the stored information as per their requirement, For example, information kiosks may located • At an airport or a railway station to provided information to arriving passengers about hotels, restaurants, tourists spots, etc. in the city. • In large museums or zoos to guide the visitors to the locations of various attractions and facilities, and to caution them against things, which they are not supposed to do while inside. Afroza Nahar

  22. What is atouch screen? • Touch areas of screen with finger • Often used with kiosks Afroza Nahar

  23. Input Devices • Data Scanning Devices • Optical Character Recognition (OCR ) Device • Optical Mark Reader (OMR) • Bar-Code Reader • Magnetic-Ink Character recognition (MICR) • Digitizer • Electronic-card Reader • Voice Recognition Devices Afroza Nahar

  24. 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 Voice Input 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.

  25. What is aMIDI (musical instrument digital interface)? • External device, such as electronic piano keyboard, to input music and sound effects Afroza Nahar

  26. Output Devices • The various types of output devices along with their typical application • Monitor • Printers • Plotters • Screen image projector • Voice response system Afroza Nahar

  27. portrait landscape What is aprinter? • Output device that produces text and graphics on paper • Result is hard copy, or printout • Two orientations: portrait and landscape Afroza Nahar

  28. How does an ink jet printer work? • Nozzle-like print head that sprays ink onto paper to form characters and graphics • Most ink jet printers use CMYK color Afroza Nahar

  29. How do laser printers compare to ink jet printers? • A laserprinter paints dots of light on a light-sensitive drum • Higher quality than ink jet • More expensive to buy than ink jet • Less expensive to operate than ink jet Afroza Nahar

  30. How do laser printers compare to ink jet printers? Afroza Nahar

  31. What is a dot matrix printer? • Produce characters and graphics by using a grid of fine wires • Introduced in 1970s • Low quality output • Used for “back-office” applications that demand low operating cost and dependability • Can print multipart carbon forms Afroza Nahar

  32. What is a dot matrix printer? Afroza Nahar

  33. Dot matrix printer Afroza Nahar

  34. Afroza Nahar

  35. Budget Speed Color orblack and white Cost per page Graphicscapability Photo printing Paper typesand sizes Systemcompatibility Future needs Wirelesscapability How do you know which printer to buy? • Depends on printing needs Afroza Nahar

  36. What other printer technologies are available? • Thermal transfer printer • Uses page-sized ribbons coated with wax • Print head consists of heating elements to melt the wax • Dye sublimation printer • Similar to wax, but page-sized ribbon contains dye • Print heads diffuse the dye Afroza Nahar

  37. Printers: What features should I look for in a printer? • Resolution • Measured in dpi (dots per inch) • Printspeed • Measured either by pages per minute (ppm) or characters per second (cps) • Color takes longer than black and white • Text prints faster than graphics Afroza Nahar

  38. What features should I look for in a printer? • Dutycycle - indication of the number of pages a printer can be expected to print per month • Indicates maintenance costs • Operating costs • Printers require ongoing costs including ribbons, ink cartridges, and toner • Per copy cost is the cost of printing a page with an average amount of text, graphics, and color Afroza Nahar

  39. What features should I look for in a printer? • Duplex capability • A printer with duplex capability can print on both sides of the paper • Memory • A computer sends data for a printout to the printer along with a set of instructions on how to print the data Afroza Nahar

  40. Installing Peripheral Devices: Is it difficult to install a new peripheral device? • Internal devices • Tools required • Screwdriver • Directions • Before installing • Unplug the computer • Ground yourself • Installing • Follow the directions Afroza Nahar

  41. What’s an expansion slot? • Expansion slot- long, narrow socket on the system board into which you can plug an expansion card • Expansion card- small circuit board that provides computer with ability to control storage, input or output device Afroza Nahar

  42. What’s an expansion slot? • ISA (Industry Standard Architecture) • Used today only for some modems and other relatively slow devices • PCI (Peripheral Component Interconnect) • Offers fast transfer speeds and a 32-bit or 64-bit data bus • AGP (Accelerated Graphics Port) • Provides a high-speed data pathway primarily used for graphics cards Afroza Nahar

  43. Do notebook computers contain expansion slots? • Equipped with a special type of external slot called aPCMCIA slot • Typically a notebook only has one slot, but the slot can hold more than onePC card(PCMCIA expansion cards) Afroza Nahar

  44. What is an expansion port? • Used to connect a peripheral device • Expansionport - any connector that passes data in and out of a computer or peripheral device Afroza Nahar

  45. What is a digital camera? • Allows you to take digital pictures • Images viewable immediately on camera • Download to computer • Post pictures to Web Afroza Nahar

  46. How does a digital camera work? Step 3. CCD generates an analog signal that represents the image. Step 1. Point to the image to photograph and take picture. Light passes into the lens of the camera. Step 2. Image is focused on a chip called a charge-coupled device (CCD). Step 4. Analog signal is converted to digital signal by analog-to-digital converter (ADC). Step 5. Digital signal processor (DSP) adjusts quality of image and usually stores digital image on miniature mobile storage media in the camera. Step 6. Images are transferred to a computer’s hard disk by plugging one end of the cable into a camera and the other end into a computer; or images are copied to hard disk from storage media used in the camera. Step 7. Using software supplied with the camera, images are viewed on screen, incorporated into documents, edited, and printed. Afroza Nahar

  47. 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 Afroza Nahar

More Related