Output devices Computer Computer Application in Business
• 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
monitor, printer and speakers are all
TYPES OF OUTPUT DEVICES
• 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.
• 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.
• Monitors are the most popular output
devices used for producing soft-copy
• Display the output on a television like
• Monitor is associated with a keyboard is
called a video display terminal (VDT).
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.
• Most common output devices for producing
• Printer prints whatever is on the monitor onto
paper. Printers can print words, numbers, or pictures.
• Types are
Dot matrix printer
• Head runs back and
forth, up and down.
• Strike an inksoaked cloth
• Produces output on
• Prints by heating
• Coating turns black
• It creates the
• Propel drops of ink
• Most common
• Low cost.
• High quality output
• Uses static
• Toner clinges to –ve
charged area of drum
• Drum rolls over the
paper to give output
• 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
• Paper is fixed on
• Pens are moved to
draw the image.
• Can use different
colour pen to draw.
• The pen is moved
on single axis.
• Paper itself moves
• It gives different
axis or dimension.
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
• 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
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
– Speakers – Attach to sound card
• Generates an audio signal and send it to a
• It convert digital signal to analog signal
• It is usually a separate circuit board
• It is plugged in to the motherboard
A speaker is a device that
produces computer output as
Speakers are common
devices in computer systems
Two-device set speakers
Surround sound speakers
• 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.
VOICE RESPONSE SYSTEM
• Voice response system enables a computer
to talk to a user
• Has an audio-response device that produces
• Such systems are of two types:
– Voice reproduction systems
– Speech synthesizers
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
machines, video games, etc.
• Converts text information into spoken
• Used for applications such as:
– Reading out text information to blind persons
– Allowing those persons who cannot speak to
– Translating an entered text into spoken words in
a selected language