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Output devices Computer Computer Application in Business


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Output devices Computer Computer Application in Business

  1. 1. OUTPUT DEVICES • An output device lets a computer to communicate with you. The devices which are used to display the data to the user either in the form of hard copy or soft copy are called output devices. A monitor, printer and speakers are all output devices.
  2. 2. TYPES OF OUTPUT DEVICES Soft-copy Output • A soft copy is the unprinted digital document file. This term is often contrasted with hard copy. It can usually be viewed through an appropriate editing program, such as word processing programs, database programs, or presentation software, depending on the file type. • It can be transported from one computer to another through file transfer/downloading mechanisms such as FTP or HTTP, as an email attachment, or through USB drives and other disk drives. Keeping a digital copy of a document can allow easy editing of it later on. Hard-copy Output • Produced on a paper or some material that can be touched and carried for being shown to others • Permanent in nature and can be kept in paper files or can be looked at a later time when the person is not using the computer • Examples are output produced by printers or plotters on paper.
  3. 3. COMMONLY DEVICES • • • • • • USED Monitor Printer Plotter Screen image projector Speaker Voice response system OUTPUT
  4. 4. MONITORS • Monitors are the most popular output devices used for producing soft-copy output. • Display the output on a television like screen. • Monitor is associated with a keyboard is called a video display terminal (VDT).
  5. 5. TYPES OF MONITOR • Cathode-ray-tube (CRT), are oldest among all available models these days. These monitors function on the old cathode ray tube phenomena. The best thing in CRTs is that they are easily available and are in cheaper in price. They consume more power. • Flat-panel monitors Liquid crystal display monitors are not the latest but the later version than CRT monitors. Unlike CRT monitors, these monitors are compact and slim. Now they are also used with non- portable desktop computer systems because they occupy less table space. These monitors do consume low and almost have no dependency on backlight technology. Due to its quality of consuming low power and compact in shape and size.
  7. 7. PRINTERS • Most common output devices for producing hard-copy output • Printer prints whatever is on the monitor onto paper. Printers can print words, numbers, or pictures. • Types are – – – – Dot matrix printer Thermal printer Inkjet printer Laser printer
  8. 8. DOT MATRIX • Head runs back and forth, up and down. • Strike an inksoaked cloth ribbon. • Produces output on paper. 8
  9. 9. THERMAL • Prints by heating thermal paper. • Coating turns black where heated • It creates the image.
  10. 10. INKJET PRINTER • Propel drops of ink on page. • Most common type. • Low cost. • High quality output
  11. 11. LASER PRINTER • Uses static electricity as temporary glue. • Toner clinges to –ve charged area of drum • Drum rolls over the paper to give output
  12. 12. PLOTTERS • Plotters are an ideal output device for architects, engineers, city planners, and others who need to routinely generate highprecision, hard-copy graphic output of widely varying sizes • Two commonly used types of plotters are: – Flatbed plotter – Drum plotter
  13. 13. FLATBED PLOTTER • Paper is fixed on flat surface. • Pens are moved to draw the image. • Can use different colour pen to draw.
  14. 14. DRUM PLOTTER • The pen is moved on single axis. • Paper itself moves on drum. • It gives different axis or dimension.
  15. 15. SCREEN IMAGE PROJECTOR • An output device that can be directly plugged to a computer system for projecting information from a computer on to a large screen • Useful for making presentations to a group of people with direct use of a computer • Full-fledged multimedia presentation with audio, video, image, and animation can be prepared and made using this facility
  17. 17. AUDIO OUTPUT: SOUND CARD AND SPEAKER • Audio output is the ability of the computer to output sound. • Two components are needed: – Sound card – Plays contents of digitized recordings – Speakers – Attach to sound card
  18. 18. SOUND CARD • Generates an audio signal and send it to a computer’s speakers • It convert digital signal to analog signal • It is usually a separate circuit board • It is plugged in to the motherboard
  19. 19. SPEAKER • A speaker is a device that produces computer output as sound • Speakers are common devices in computer systems Examples include: • Built-in speaker • Two-device set speakers • Surround sound speakers
  20. 20. HEADPHONE • Headphones give sound output from the computer. They are similar to speakers, except they are worn on the ears so only one person can hear the output at a time.
  21. 21. VOICE RESPONSE SYSTEM • Voice response system enables a computer to talk to a user • Has an audio-response device that produces audio output • Such systems are of two types: – Voice reproduction systems – Speech synthesizers
  22. 22. VOICE REPRODUCTION SYSTEM • Produce audio output by selecting an appropriate audio output from a set of pre-recorded audio responses • Applications include audio help for guiding how to operate a system, automatic answering machines, video games, etc.
  23. 23. VOICE SYNTHESIZER • Converts text information into spoken sentences • Used for applications such as: – Reading out text information to blind persons – Allowing those persons who cannot speak to communicate effectively – Translating an entered text into spoken words in a selected language
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