Discovering Computers

Enhanced Edition ©2017

Tools, Apps, Devices, and the Impact of Technology

Chapter 7
Input and Output
Objectives Overview

Differentiate among various

Describe characteristics of
types of keyboards:
various pointing devices: Describe various uses of
standard, compact, on-
mouse, touchpad, and touch screens
screen, virtual, ergonomic,
trackball
gaming, and wireless

Describe various types of Describe various uses of

pen input: stylus, digital motion input, voice input,
pen, and graphics tablet and video input

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Objectives Overview

Differentiate among various Explain the characteristics of Summarize the various types of
scanners and reading devices various displays printers

Identify the purpose and features

of speakers, headphones and
Identify various assistive
earbuds, data projectors,
technology input and output
interactive whiteboards, and
methods
force-feedback game controllers
and tactile output

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What Is Input?

• Input is any data and

instructions entered
into the memory of a
computer

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What Is Input?
Commonly used input methods include:

Pointing
Keyboard Touch screens Pen input
devices

Scanners and
Motion input Voice input Video input reading
devices

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Keyboards
A keyboard is an input device that contains keys users press to enter data and instructions into a computer or mobile device

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Keyboards
Most desktop computer keyboards have…

Typing Function
area keys
Navigatio
Toggle key
Page 320 n keys
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Keyboards
There are a variety of keyboard options for computers and mobile devices

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Keyboards

An ergonomic keyboard has a design that reduces the

chance of repetitive strain injuries of wrist and hand
Ergonomics incorporates comfort, efficiency, and safety in
the design of the workplace

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Pointing Devices

A pointer is a small
symbol on the screen
whose location and shape
change as a user moves a
Page 322
pointing device
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Pointing Devices
A mouse is a pointing device that fits under the palm of your hand comfortably

• Optical mouse, laser mouse, and touch mouse

Paged 322 – 323

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Pointing Devices
•A •A
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Pages 323- 324
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Touch Screens
A touch screen is a touch-sensitive display

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Pen Input

With pen input, you touch a stylus or digital pen on a flat

surface to write, draw, or make selections

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Pen Input

• A graphics tablet, also

called a digitizer, is an
electronic plastic board
that detects and
converts movements of
a style or digital pen
into signals that are
sent to the computer

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Motion, Voice, and Video Input
With motion input, sometimes called gesture recognition, users can guide on-screen elements using air gestures

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Motion, Voice, and Video Input

• Voice input is the

process of entering input
by speaking into a
microphone
• Voice recognition, also
called speech
recognition, is the
computer or mobile
device’s capability of
distinguishing spoken
words
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Motion, Voice, and Video Input

• Audio input is the

process of entering any
sound into the computer
such as speech, music,
and sound effects
• Music production
software allows users to
record, compose, mix,
and edit music and
sounds

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Motion, Voice, and Video Input

Video input is the process of capturing full-motion images and storing

them on a computer or mobile device’s storage medium
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Motion, Voice, and Video Input
A webcam is a type of DV camera that enables a user to:

Send email
Capture video
messages with
and still images video attachments

Broadcast live Conduct

images or video
Page 332
videoconferenc
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Motion, Voice, and Video Input
A videoconference is a meeting between two or more geographically separated people

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Scanners and Reading Devices
A scanner is a light-sensing input device that reads printed text and graphics and then translates the results into a form the computer can
process

• A flatbed scanner works in a manner similar to a copy

machine except it creates a file of the document in
memory instead of a paper copy

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Scanners and Reading Devices

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Scanners and Reading Devices

An optical reader is a device that uses a light source to read

characters, marks, and codes and then converts them
into digital data that a computer can process
• Optical character recognition (OCR)
• Optical mark recognition (OMR)

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Scanners and Reading Devices

• A bar code reader, also

called a bar code
scanner uses laser
beams to read bar
codes
• A QR code stores
information in both a
vertical and horizontal
direction

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Scanners and Reading Devices

RFID (radio frequency identification) uses radio signals to

communicate with a tag placed in or attached to an object
An RFID reader reads information on the tag via radio waves
RFID can track:

Tracking times Tracking location

of runners in a of people and
marathon other items

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Scanners and Reading Devices
Magstripe readers read the magnetic stripe on the back of cards such as:

Credit cards

Entertainment cards

Bank cards

Identification cards

Other similar cards

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Scanners and Reading Devices

MICR (magnetic ink character recognition) devices read text printed

with magnetized ink
An MICR reader converts MICR characters into a form the computer
can process
Banking industry uses MICR for check processing

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Scanners and Reading Devices
A data collection device obtains data directly at the location where the transaction or event takes place

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What Is Output?

• Output is data that has

been processed into a
useful form

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Displays
A display visually conveys text, graphics, and video information
A monitor is a display that is packaged as a separate peripheral device

• LCD monitor

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Displays

The quality of a display depends primarily on its:

Resolutio Response
n time

Brightness
Page 342
Dot pitch
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Displays
Today’s monitors use a digital signal to produce a picture
To display the highest quality images, the monitor should plug into:

• A DVI port
• An HDMI port
• A DisplayPort

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Displays

• Home users sometimes

use a digital television
(DTV) as a display
• HDTV is the most
advanced form of digital
television
• A Smart TV is an
Internet-enabled HDTV

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Printers

• A printer
produces text
and graphics on
a physical
medium
• Before
purchasing a
printer, ask
yourself a series
of questions
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Printers
A nonimpact printer forms characters and graphics on a piece of paper without actually contacting the paper

Ink-jet Photo
printers printers
Page 345
Laser All-in-one
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Printers

An ink-jet printer forms characters and graphics by spraying

tiny drops of liquid ink onto a piece of paper
• Color or black-and-white
• Speed is measured by the number of pages per minute (ppm) it
can print

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Printers

A photo printer produces lab-quality photos

• Many use ink-jet technology

• PictBridge allows you to print photos directly from a digital camera
• Print from a memory card

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Printers

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Printers

Laser
printer

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Printers
An all-in-one printer is a single device that prints, scans, copies, and in some cases, faxes

• Also called a multifunction printer

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Printers
A 3-D printer uses a process called additive manufacturing to create an object by adding material to a three-dimensional object, one
horizontal layer at a time

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Printers
A thermal printer generates images by pushing electrically heated pins against the heat-sensitive paper

Dye-sublimation printer

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Printers
A mobile printer is a small, lightweight, battery-powered printer that allows a mobile user to print from a mobile device

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Printers
A label printer is a small printer that prints on an adhesive-type material that can be placed on a variety of items

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Printers
Plotters are used to produce high-quality drawings
Large-format printers create photo-realistic quality color prints

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Printers
Impact printers form characters and graphics on a piece of paper by striking a mechanism against an inked ribbon that physically contacts
the paper

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Other Output Devices
Many users attach surround sound speakers or speaker systems to their computers, game consoles, and mobile devices to generate higher-
quality sounds

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Other Output Devices

• Headphones are
speakers that cover or
are placed outside of
the ear
• Earbuds (also called
earphones) rest inside
the ear canal

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Other Output Devices

• A data projector is a
device that projects the
text and images
displaying on a
computer or mobile
device screen on a
larger screen so that an
audience can see the
image clearly

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Other Output Devices

• An interactive
whiteboard is a touch-
sensitive device,
resembling a dry-erase
board, that displays the
image on a connected
computer screen

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Other Output Devices
Joysticks, wheels, gamepads, and motion-sensing game controllers can be considered output devices when they include force feedback

• Technology that sends resistance to the device in

response to actions of the user

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Assistive Technology Input and Output

Head-mounted pointer Braille printer

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Summary

Variety of Several assistive

options for input technology options
and output for input and output

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 Discovering Computers
Enhanced Edition ©2017
Tools, Apps, Devices, and the Impact of Technology

Chapter 7
Input and Output

Chapter 7 Complete