Input and output devices
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The document provides an overview of various input and output devices used in computing, detailing their functions and types. Input devices include keyboards, mice, scanners, and webcams, while output devices encompass monitors, printers, and speakers. Each device is described in terms of its operation and historical development, highlighting their importance in human-computer interaction.
Input and output devices
- 2. INPUT DEVICES Hardware device that sends data to a computer, allowing you to interact with and control the computer. Input device Memory Output device
- 3. VIDEO DEVICES Used to digitize images or video from the outside world into the computer. Digital camera Webcam Media players
- 4. WEBCAM A webcam is a hardware camera connected to a computer. captures a video image of the scene in front of it. Either built in or connected through USB. Digital cameras can also be connected to a computer to transfer photos and videos. Most digital cameras do not directly input data into a computer - they store photographs on memory cards.
- 5. MEDIA PLAYERS Devices that play any sort of media. Phyisical MP VCRs DVD players Blu-ray players DMP Netflix DVRs Roku
- 6. SCANNER A device that ‘scans’ images, book pages, etc. The scanned image data is passed to the computer.
- 7. AUDIO INPUT DEVICES Allow a user to send audio signals to a computer for processing, recording, or carrying out commands. Microphone – MIDI keyboard
- 8. MICROPHONE Hardware peripheral that allows computer users to input audio into their computers MIDI information is sent to a computer that is capable of reproducing an array of digital sounds that resemble traditional analog musical instruments.
- 10. •Hardware input device which allows the user to move the mouse pointer, • Examples of pointing devices are computer mouse, trackball,light pens,touchpad,and even the keyboard. •A pointing device is an external tool that is used to move objects around and also to select options from menus.
- 11. PEN The pen lets you draw on what is called a digitizing tablet that mirrors the surface area of the computer screen.The pen can be used as a standard mouse (without wires connected to it) or also as a free flowing drawing device.The pen is useful for drawing since drawing,graphics with a mouse tends to be somewhat difficult.
- 12. Mouse The mouse is a hand held device that lets you point to and selected icons on your screen. In a PC mouse there are mostly 2-3 buttons and on a Mac there is a one. A ball under the mouse senses movement to ensure smooth motion your should remove the ball and clean it regularly. Keyboard One of the main input or point and draw device used on a computer, a PC ‘s keyboard looks very similar to the keyboards of electric typewriters,with some editional keys.Below is a graphic of the Saitek gamers keyboard with indicators pointing to each of the major portions of the keyboard.
- 13. CORDLESS MOUSE The cordless mouse is a lot better than a normal mouse thus by reducing the clutter of the work needed to move the mouse around.When you move the mouse it sends an infrared beam to a sensor which interprets it causing it to a Move. TRACKBALL Tom Cranston and Fred Longstaff, Ferranti Canada. Developed a trackball for use in DATAR computer.The trackball is an upside down mouse that remains stationary on your desk. same as mouse except that the rollers are reversed
- 14. TOUCHPAD The touchpad has sensors that sensor touch when thy sensor touch they send a signal to the computer to move the mouse pointer to that location on the screen JOYSTICK The joystick allows the user to move quickly in computer games light pen- the light pen system allows the user to touch the computer screen with a lighted pen to activate commands and make selections.
- 15. LIGHT PEN The light pen system allows the user to touch the computer screen with a lighted pen to activate commands and make selections. TOUCH SCREEN The touch screen lets the user touch the area to be activated by using the finger or hand.
- 16. Keyboard and Data Scanning devices
- 17. WHAT IS KEYBOARD? Primary input devices used with a computer that looks similar to electric typewriters, but with some additional keys. Allows the user to input letters,numbers, and other symbols that often function as commands.
- 18. HISTORY Typewriters are called as definite ancestors of all key-based text entry devices. The computer keyboard drives from the utility of two devices 1. Teleprinters (or teletypes) 2. KeypuncheS For the very first time Frank Pearne started working on telepronters,later on it is developes in 1907-1910by american mechanical engineer Charles Krum and his son Howard. In 1930 Herman Hearth developed the first key punch device. From the 1940s until the late 1960s, typewriters were the main means of data entry and output for computing. Keyboards remain central to human-computer interaction to the present, even as mobile personal computing devices such as smartphones.
- 20. TYPES OF KEYBOARD Lap Laptop keyboards The size of the notebook keyboard, which is always smaller by and not including control keys or a keypad. Smartphone and tablet keyboards Most of today's smart phones and tablets do not have a physical keyboard use a thumb keyboard or on- screen keyboard to type messages using their thumbs or other fingers.
- 21. SCANNER A device that scans documents and converts them into digital data.
- 22. COMMON TYPES OF SCANNER FLAT –BED SCANNER Looks like a photocopy machine. Has a box with a glass plate on the top and a lid. Document to be scanned placed on a glass plate. A light source below the glass plate moves from 1 line to the another and scan all lines. Take few seconds to scan.
- 23. HAND HELD SCANNER Contain LED’s and can be held in hand To scan dragged slowly over the document from one end to another Has to be dragged very slowly. Used only when high acuuracey is not needed. Cheeper then a flatbed scanner. Used when volume of documents to be scanned is low
- 24. OTHER TYPES OF SCANNER OMR-OPTICAL MARK READER Bar code reader
- 25. MICR-Magnetic Ink Character Recognition DIGITIZER ELECTRONIC CARD READER
- 27. OUTPUT The information generated after processing data is called output. There is different type of output. Soft copy output Hard copy output
- 28. OUTPUT DEVICES Output devices are hardware component, attached with computer. They take information from computer and convert it in the form understandable by user. The commonly used output devices are: Monitor Printer Plotter Speaker
- 29. WHAT IS A MONITER/DISPLAY SCREEN? CRT Monitors Flat Screen
- 30. MONITOR/DISPLAY SCREEN Display screen is most common output devices. It is also called Monitor or simply screen. It is used to display output as soft copy.
- 31. CONT… Size: Display screen are available in different size. The size of a display screen is measured diagonally from one corner to another. The common sizes of display screen are from 13 to 22 inches. Color: There are two types of display screens. Monochrom RGB
- 32. CONT… Monochrome: This display screen uses two colors one as background and others as foreground to display text, images, graphics etc. It is commonly called black and white display screen. RGB: This is color display screen. RGB stands for Red, Green, and Blue. Different combinations of these colors are used to display color images on the screen.
- 33. TYPES OF DISPLAY SCREEN There are two types of display screen. Cathode Ray Tube(CRT) Flat Panel Display.
- 34. CRT MONITOR: It is most common form of display screen. It looks like a TV screen. CRT is a vacuum tube. There are one or more electron guns at the end of tube. CRT electron gun converts bits in to beam of electrons. When beam of electrons hits the phosphor dots they glow. The combined effect of these dots generates an image on the screen.
- 36. FLAT PANEL MONITOR Flat panel monitor is lightweight, take less space and consume less power than CRT monitor. Laptop computer uses flat panel monitor. Flat Panel Monitor can also be used with personal computer. Flat Panel Monitor is made up of two glass plates. There is a substance between two glass plates. This substance is activated in different ways. There are three types of flat panel display screen.
- 37. TYPES OF FLAT PANEL LCD ELD Gas Plasma Display
- 38. CONT… LCD: LCD stands for Liquid Crystal Display. LCD uses liquid crystal between the glass plates. The molecules of liquid crystal line up in such a way that light behind the screen is blocked or allowed through to create images. ELD: ELD stands for Electronic Luminescent Display. It contains a substance between two glass plates. This substance glows when electric current charges it. Gas Plasma Display: These monitors use gas plasma technology. There is a layer of gas between two glass plates. This gas glows when electric charges is supplied. This technology offers large screen size and higher display quality.
- 40. 4 0 PRINTER ITS TYPES, WORKING AND USEFULNESS
- 41. 4 1 Printers Impact Printers Non-Impact Printers Daisy wheel Dot- Matrix Inkjet Thermal Laser
- 42. An external hardware device responsible for taking computer data and generating a hard copy of that data. Printers are one of the most commonly used peripherals and they print text and still images on the paper. 4 2 WHAT IS A PRINTER?
- 43. “IMPACT PRINTER” These printers have a mechanism that touches the paper to create an image. These printers work by banging a print head containing a number of metal pins which strike an inked ribbon placed between the print head and the paper. An impact printer showing details of print head. 43
- 44. “NON-IMPACT PRINTERS” These printers create an image on the print medium without the use of force. They don’t touch the paper while creating an image. Non-impact printers are much quieter than impact printers as they don’t strike the paper. A non-impact printer 44
- 45. PROJECTORS
- 46. WHAT IS A PROJECTOR? It is an electronic device used to project rays of light, especially an apparatus with a system of lenses for projecting images or film onto a screen. 46
- 47. • LCD • DLP • CRT THE MAIN TYPES OF PROJECTORS
- 48. Liquid Crystal Display 3 different LCD glass panels for Red, Blue, Green(These transfer the image signal to the to projector. Cheap home theatre option LCD
- 49. DLP Optical semi-conductor called a DMD chip(Digital micro mirror device) Consists of millions of mirrors, that work at 10 different degrees in angles. DMD chips can produce 1024 shades of grey. DLP
- 50. Cathode Ray tube- three tubes commonly called guns, These 3 tubes combine colors to create the image. Low picture brightness quality Very cumbersome in size Can be tuned and refined to a great picture quality. CRT
- 51. PLOTTERS
- 53. PUNCHED CARDS Punched cards, popularly known as IBM cards, were the dominant input device prior to the introduction of personal computers. Punched cards use a Hollerith code, named after its inventor, Herman Hollerith (1860–1929). Each card has eighty columns with one character per column; therefore each punched card holds eighty characters or exactly one row of text or characters a unit record.
- 54. COMPUTER PROGRAMMING IN THE PUNCHED CARD ERA Invention: From the invention of computer programming languages up to the mid-1980s, many of not most computer programmers created, edited and stored their programs line by line on punched cards.
- 55. HOW DOES IT WORK ? •A punched card is a flexible write-once medium that encodes data, most commonly 80 characters. •Users could create cards using a desk- sized keypunch with a typewriter-like keyboard. •A typing error generally necessitated re- punching an entire card. •The editing of programs was facilitated by reorganizing the cards, and removing or replacing the lines that had changed; programs were backed up by duplicating the deck, or writing it to magnetic tape.
- 57. Uses: Headphones are a pair of small loudspeakers that are designed to be held in place close to ears. They are also known as ear speakers, ear phones, cans and ear buds HEAD PHONES
- 58. 1910 – Nathaniel Baldwin began manufacturing the first modern headphones 1937 – The DT-48’s from Beyer dynamic became the first dynamic headphones to hit the market REVLOUTION OF HEADPHONES
- 59. 1949 – With design in mind, AKG produced their first pair of headphones, the K120’s. If they were reproduced today, they would sell like hotcakes at Urban Outfitters 1958 – John C. Koss changed the headphone game. In 1958, Koss created the first stereo headphones (Koss SP-3) and launched an all out assault on awaiting ear canals.
- 60. 1959 – At a show in Tokyo, Stax debuted the world’s first ever electrostatic pair of headphones 1979- the most important event in the history of headphones PORTABLE headphones. first Walkman were Sony’s MDL-3L2
- 61. 1980 Both the earbud and the in-ear headphone made their way onto the scene in the 80’s even though they wouldn’t reach their peak in popularity until one Steven Paul Jobs changed the music game years later 1997 neckband headphones were introduced
- 62. 2001 – The iPod changed up the whole music universe. It became common to see people with a white cord running from their pocket to their ears multiple times a day. 2012 – Headphones have become as much about style as they are sound quality. This may never have been more relevant than when Lil Wayne wore these $1 million dollar pair of Beats.
- 63. SPEAKERS Speakers are popular output devices used with computer systems. They receive audio input from the computer's sound card and produce audio output in the form of sound waves. Most computer speakers are active speakers, meaning they have an internal amplifier which allows you to increase the volume, or amplitude, of the sound. Speakers usually come in pairs, which allows them to produce stereo sound from two separate audio channels.
- 64. Components: In a component system, each speaker has its own driver, so there are multiple drivers dedicated to their own range of frequencies. Full range: Full range speakers are more common, as they are used in many factory audio systems. This makes them more widely available and more affordable than component systems. TYPES OF SPEAKERS