Welcome to the presentation of input & output


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Welcome to the presentation of input & output

  1. 1. 03/09/2012 1
  2. 2. To know about various input devices like keyboard, mouse, trackball, etc. To discuss about various output devices like monitor, printer, etc. To understand the classification of monitor, printer, etc.03/09/2012 2
  3. 3. Input /output devices are those devices thatallows computer to perform the specific tasks. Suchare as follows :-  Receive information for processing.  Receive information after processing .  Store the information . 03/09/2012 3
  4. 4. 03/09/2012 4
  5. 5. Following categories of devices could be found in a computer:- Input Devices : Input devices are those devices which are purelyused for input purpose. For example, keyboard, mouse, etc. Inputdevices are used for entering data or instructions into a computer.Output Devices: Output devices are those devices which arepurely used for output purpose. For example, monitor, printer, etc. Input and Output Devices: Input and Output devices are thosedevices which can act as input as well as output devices and can beused for both input and output purpose. For example, Hard DiskDrive, Magnetic Tape, Floppy Disk Drive. 03/09/2012 5
  6. 6.  Text Input Devices : Keyboard, etc.  Pointing Devices : Mouse, Light Pen, etc.  Gaming Devices : Joystick, Gamepad, etc.  Image, Video Devices: Image Scanner, Web Camera, etc.  Audio Input Devices : Microphones03/09/2012 6
  7. 7.  Keyboard  Touch Screen  Mouse  Digitized Tablet  Scanner  Digital Pen  Joystick  MICR Device  Web Camera  OBR Device  OMR Device  OCR Device  Voice / Speech Recognition Device03/09/2012 7
  8. 8.  A keyboard is the set of typewriter-like keys that enables you to enter data into a computer. Computer keyboards are similar to electric-typewriter keyboards but contain additional keys.  A keyboard is an input device, partially modeled after the typewriter keyboard.03/09/2012 8
  9. 9.  Alphanumeric Keys: Alphabetical, numeric, and punctuation keys are used in the same fashion as a typewriter keyboard to enter their respective symbol into a word processing program, text editor, data spreadsheet, or other program.  Capital Alphabets A–Z  Small Alphabets a–z  Digits 0–9  Special Symbols !, @, #, $, %, ^, &, *, (, ), -, +, =, etc.03/09/2012 9
  10. 10. Modifier Keys Modifier keys are special keys that modify the normal action of another key,when the two are pressed in combination. For example, <Alt> + <F4> in MicrosoftWindows will close the program in an active window. The most widely-used modifier keys include the Control key, Shift key and theAlt key. A Control key is a modifier key which, when pressed in conjunction withanother key, will perform a special operation. The Shift key is a modifier key which is used to type capital letters and other alternate "upper" characters. The Alt key on a computer keyboard is used to change (alternate) the functionof other pressed keys. The Space bar, spacebar, or space key, is a key whose main purpose is to conveniently enter the space, e.g., between words during typing. The Enter key causes a command line, window form or dialog box to operate itsdefault function. 03/09/2012 10
  11. 11. Keyboard Types Standard (QUERTY) Non-Standard Non-Standard keyboards are Standard keyboards are much just specialized keyboard which like the old typewriter. serves a specific purpose.03/09/2012 11
  12. 12. A basic computer keyboard that does not have any advanced features has 84 keys. The multimedia computer keyboard has 101 keys and these keys are often referred to as shortcuts or hot keys. Some multimedia keyboards have 104 keys and such devices provide more features as compared to a keyboard with 101 keys.03/09/2012 12
  13. 13. 84 Keys keyboard 101 Keys keyboard 104 Keys keyboard Laptop keyboard03/09/2012 13
  15. 15.  Chorded Keyboard lets the user type in characters or commands by pressing a combination of keys. The chorded keyboard design is typically used for hand-held computers that cannot accommodate standard-sized keyboards.03/09/2012 15
  16. 16. Touch screens come with a stylus, a pen-like devicethat doesnt have ink. This technology is typicallyused in products such as iPods and iPhones.03/09/2012 16
  17. 17. Virtual keyboards, such as the I-Tech Virtual LaserKeyboard, project an image of a full-size keyboardonto a surface. Sensors in the projection unit identifywhich key is being "pressed" and relay the signals toa computer or personal digital assistant. There is alsoa virtual keyboard, the On-Screen Keyboard, for useon Windows.03/09/2012 17
  18. 18. Foldable keyboards, as the name suggests, can be folded and made to fit into uneven spaces, so they can be very handy during travels.03/09/2012 18
  19. 19.  A mouse is a pointing device which is used to control & move the cursor on the screen.This input device controls the cursor on thecomputer screen. It has two or three buttons and acable connecting it to the computer. It is quite easyto operate a mouse, the user simply moves thecursor along the table. Once the cursor is at thedesired location, the user can give instructions tothe computer by clicking the button.03/09/2012 19
  20. 20. This type of mouse comes with a serial connector, it requires a free serial port on your PC.This type of mouse has a USBconnector and requires a freeUSB port to connect to thecomputer. 03/09/2012 20
  21. 21. A cordless mouse (as the name suggests) has no cable, this type of mouse utilizes batteries for its power supply.An optical mouse utilizes opticalelectronics to track the mousesposition and movement, they arepreferred over standard mechanicalmice as they tend to be more reliableand require less maintenance. 03/09/2012 21
  22. 22.  A scanner is a device that optically scans images, printed text, handwriting, or an object, and converts it to a digital image.  Scanners typically read red- green-blue color (RGB) data from the array. This data is then processed with some proprietary algorithm to correct for different exposure conditions, and sent to the computer via the devices input/output interface .03/09/2012 22
  23. 23.  Monitors  Printers Speakers  Head Phones  Computer Output Microfilm (COM)03/09/2012 23
  24. 24.  A monitor or display (sometimes called a visual display unit) is the screen on which words, numbers, and graphics can be seem. The monitor is the most common output device. CRT MONITOR The monitor comprises the display device, circuitry, and an enclosure. The display device in modern monitors is typically a thin film transistor liquid crystal display (TFT-LCD), while older monitors use a cathode ray tube (CRT). 03/09/2012 TFT MONITOR 24
  25. 25. As with television , many hardware technology exist for displaying computergenerated output: LCD (LIQUID CRYSTAL DISPLAY)  Passive LCD’s are noted for poor contrast and slow response. They were used in laptops until the mid 1990’s.  Thin film transistor nearly all modern LCD monitors are TFT screen . CRT (CATHODE RAY DISPLAY)  Raster scan computer monitors produce images using pixels. There were the most popular display device for older computers.  Vector displays as used on the scientific and radar application and several early arcade machines such as asteroids use CRT displays . Because of requirement for a deflection system although a raster based display may be used .  Television sets were used by the most early personal and home computers . Resolution and image quality were limited by its dilpaly capability .  Penetron – military aircraft display . 03/09/2012 25
  26. 26.  Plasma display . Video projection use CRT , LCD , DLP (Display light projection) and other technology to emit light to a projection screen . Surface – conduction electron emitter display (SED) and field emission display (FED). Organic light – emitting diode display (OLED). 03/09/2012 26
  27. 27.  Printer is a device that prints text or illustrations on paper and in many cases on transparencies and other media.  It is a device that must be connected to a computer which allows a user to print items on paper, such as letters and pictures.  It can also work with digital cameras to print directly without the use of a computer.03/09/2012 27
  28. 28.  Quality of Type: The output produced by printer is said to be ether letter quality, near letter quality, or draft quality. Speed: Measured in characters per second or pages per minute, the speed of printer varies widely. Impact or Non-Impact: Impact printers include all printers that work by striking an ink ribbon. Non-impact printers work as per electro-chemical technology. Graphics: Some printers can print only text while other printers can print text as well as graphics. Fonts: Some printers are limited to one or few fonts while some printers are capable of supporting unlimited variety of fonts. 28 03/09/2012
  29. 29.  Speakers are used to play sound.  They may be built into the system unit or connected with cables.  Speakers allow a user to listen to music and hear sound effects coming from the computer system.  Some computer displays have basic speakers built-in.  Laptops come with integrated speakers.03/09/2012 29
  30. 30.  Headphones are a pair of small loudspeakers, or less commonly a single speaker, with a way of holding them close to a users ears and a means of connecting them to a signal source such as an audio amplifier, radio or CD player. They are also known as earphones, ear buds, stereo phones, headsets.03/09/2012 30
  31. 31. Circumaural headphones have Ear buds or earphones, such as theselarge pads that surround the that ship with the Apples iPod, restouter ear. in the outer part of the ear canal. Canal phones extend into the ear canal, facilitating greater dynamic range than ear buds as well as isolation from outside 03/09/2012 31A pair of supra-aural headphones noise.
  32. 32. A hardware device that accepts inputted information andalso has the capability of outputting that information.Good examples of input/output devices are as follows:- RAM FDD HDD CD-RW DVD-RW Network Card Modem ZIP Drive USB Drive Magnetic Tape03/09/2012 32
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