- 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. 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. COMMONLY DEVICES
USEDMonitor Printer Plotter Screen image projector Speaker Voice
response systemOUTPUT 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. 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. 6. TYPES OF
MONITOR 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.
DOT MATRIX Head runs back and forth, up and down. Strike an
inksoaked cloth ribbon. Produces output on paper.8 9. THERMAL
Prints by heating thermal paper. Coating turns black where heated
It creates the image. 10. INKJET PRINTER Propel drops of ink on
page. Most common type. Low cost. High quality output 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. 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. FLATBED PLOTTER Paper is fixed on flat surface. Pens are moved
to draw the image. Can use different colour pen to draw. 14. DRUM
PLOTTER The pen is moved on single axis. Paper itself moves on
drum. It gives different axis or dimension. 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 16. SCREEN IMAGE PROJECTOR 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.
SOUND CARD Generates an audio signal and send it to a computers
speakers It convert digital signal to analog signal It is usually a
separate circuit board It is plugged in to the motherboard 19.
SPEAKER A speaker is a device that produces computer output as
soundSpeakers are common devices in computer systems Examples
include: Built-in speakerTwo-device set speakersSurround sound
speakers 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. 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. 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. 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 24. QUERIES ?? 25. .