Input and Output

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Nov 17, 2013 (3 years and 7 months ago)

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COMP 6005

An Introduction
to Computing

Session Two: Computer Hardware

Input and Output

COMP 6005 An Introduction to Computing
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Session Two: Computer Hardware

2

Introduction


Input


any data or instructions
entered into the memory of a
computer



Output


data that has been
processed into a useful form

COMP 6005 An Introduction to Computing
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Session Two: Computer Hardware

3

Input


Instructions can be in the form of:


Program: series of instructions telling a
computer what to do and how to do it



Command: an instruction that causes a
particular program to perform a specific
action



User response: an instruction given by a
user by replying to a question displayed by
a program

COMP 6005 An Introduction to Computing
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Session Two: Computer Hardware

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Input Devices


Any hardware component that
permits users to enter data or
instructions into a computer



Popular devices


light pen,
keyboard, mouse, stylus,
microphone, digital camera,
scanner

COMP 6005 An Introduction to Computing
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Session Two: Computer Hardware

5

Keyboards


Issue 5
-
1, pg 232



Describe the Dvorak keyboard and
compare the differences between
the commonly used QWERTY
keyboard

COMP 6005 An Introduction to Computing
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Session Two: Computer Hardware

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Mouse


Types:


Mechanical


Rubber or metal ball on its underside


Electronic circuits translate movements into
signals that computer can process


Optical


Uses devices that emit and sense light to detect
the mouse’s movements


Can be placed on nearly any surface (except
glass)


Cordless


Battery
-
powered device that transmits data using
wireless techonology (radio wave or infrared light
waves)

COMP 6005 An Introduction to Computing
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Session Two: Computer Hardware

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Other Pointing Devices


Trackball



Touchpad



Pointing Stick



Touch Screen



Stylus and digital
pen



Cursor

COMP 6005 An Introduction to Computing
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Session Two: Computer Hardware

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Assignment


What is a cursor in reference to
input devices? Describe and
include an image



Compare and contrast the display
pen and the stylus



Discuss voice recognition and its
applications

COMP 6005 An Introduction to Computing
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Session Two: Computer Hardware

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Voice and Audio Input


Voice input


Process of entering data by speaking into a
microphone



Audio input


Process of entering any sound into the
computer: speech, music, sound effect


Inputs via microphone, tape players,
CD/DVD players, radios being plugged into
a port on the sound card

COMP 6005 An Introduction to Computing
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Session Two: Computer Hardware

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Discussion


Looking Ahead 5
-
1, pg 241



Issue 5
-
3, pg 247

COMP 6005 An Introduction to Computing
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Session Two: Computer Hardware

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Video Input


Process of capturing full
-
motion
images into a computer and storing
them on a storage medium


Types:


Digital video cameras


PC video cameras


Web cams


COMP 6005 An Introduction to Computing
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Session Two: Computer Hardware

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Other Input Devices


Scanners


Optical


Optical readers



Bar code reader



(Magnetic
-
ink Character Recognition)
MICR Reader



Data collection devices

COMP 6005 An Introduction to Computing
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Session Two: Computer Hardware

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Terminals


Point
-
of
-
Sale terminals



Automated Teller Machines



Smart Displays

COMP 6005 An Introduction to Computing
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Session Two: Computer Hardware

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Biometric Input


Fingerprint scanner



Face recognition system



Hand geometry system



Voice verification system



Iris recognition system

COMP 6005 An Introduction to Computing
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Session Two: Computer Hardware

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Biometric Input


Issue 5
-
5, pg 261



http://www.ibiometrics.net/BioBasic
s.htm


COMP 6005 An Introduction to Computing
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Session Two: Computer Hardware

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Input Devices For
Differently
-
Abled Users


Limited hand mobility persons use
a keyguard to stop them from
accidentally pressing keys


On
-
screen keyboard


Trackballs attached to a table,
whhelchair or held in user’s hand


Head
-
mounted pointers can control
the pointer or insertion point

COMP 6005 An Introduction to Computing
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Session Two: Computer Hardware

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Gesture Recognition


Still in prototype stage



Computer detects human motions



Potential to recognize sign
language, read lips, track facial
movements, follow eye gazes

COMP 6005 An Introduction to Computing
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Session Two: Computer Hardware

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Implants


Paralyzed or speech impaired
individuals can have a doctor implant a
computerized device into the brain



As the user thinks thoughts, the
transmitter will send signals to the
computer



Looking Ahead 5
-
2, pg 264

COMP 6005 An Introduction to Computing
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Session Two: Computer Hardware

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Output


Users view output on:


Screens


Via PDAs, monitors, notebooks, tablet PCs, smart
phones


Can view web sites, documents, videos, email,
etc


Print it


Can view photographs, black
-
and
-
white
documents, coloured graphics


Hear it through speakers or headset


Can listen to music, sounds, voice messages

COMP 6005 An Introduction to Computing
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Session Two: Computer Hardware

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Output


Four basic categories of output


Sound


Text


Graphics


Video


COMP 6005 An Introduction to Computing
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Session Two: Computer Hardware

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Display Devices


Output device that shows text,
graphics and video information



Types of display devices


CRT monitor


Flat
-
panel display

COMP 6005 An Introduction to Computing
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Session Two: Computer Hardware

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CRT Monitors


CRT stands for Cathode
-
ray tube (large, sealed
glass tube)



Originally curved screens; modern day uses flat
screens (more ergonomic)



Produce a small amount of electromagnetic
radiation



Issue 6
-
1, pg 297



http://www.webopedia.com/TERM/C/CRT.html

COMP 6005 An Introduction to Computing
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Session Two: Computer Hardware

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Flat Panel Display


Device with a shallow depth that does not
use CRT technology


Examples: LCD monitors, LCD screens,
gas plasma monitors, many HDTVs


Uses liquid crystal display to produce
images


Uses less power than CRT and less space


Used in Tablet PCs, notebooks, smart
phones, PDAs, e
-
books


Issue 6
-
2, pg 299

COMP 6005 An Introduction to Computing
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Session Two: Computer Hardware

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Flat
-
panel Display vs Flat
Display


Flat
-
panel display refers to a
display with a shallow depth and
uses LCD, gas plasma or some
other technology



Flat display refers to a CRT monitor
that has a flat screen

COMP 6005 An Introduction to Computing
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Session Two: Computer Hardware

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Some Other Output
Devices


Printers



Speakers and headsets



Fax machines and fax modems



Multifunction peripherals


act as several different
devices in one; printer, fax machine, scanner,
copier



Projectors


Looking Ahead 6
-
2, pg 317



Force
-
feedback joysticks and wheels


provides
resistance to the user in response to actions taken

COMP 6005 An Introduction to Computing
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Session Two: Computer Hardware

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Printers


Device that produces text and
graphics on a physical medium
(paper, transparencies, etc)



Figure 6
-
16, pg 303



Looking Ahead 6
-
1, pg 303



Issue 6
-
3, pg 306

COMP 6005 An Introduction to Computing
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Session Two: Computer Hardware

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Types of Printers


Dot
-
matrix


Ink
-
Jet


Impact


Line


Nonimpact


Photo


Laser


Thermal


Mobile


Label and
postage


Plotters and
large
-
format


Wireless


COMP 6005 An Introduction to Computing
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Session Two: Computer Hardware

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Output Devices For
Differently
-
Abled Users


Hearing
-
impaired users will have
programs display words and no sound


Visually
-
impaired users can increase
size, change colour


Blind users can work with voice output
instead of using a monitor


computer
reads what is displayed


An alternative for blind users is a Braille
printer


information outputted onto
paper in Braille

COMP 6005 An Introduction to Computing
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Session Two: Computer Hardware

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Discussion


Issue 6
-
4, pg 314



Issue 6
-
2, pg 299



Issue 6
-
5, pg 319



COMP 6005 An Introduction to Computing
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Session Two: Computer Hardware

30

Assignment


Read the Special Feature pg 334
-
345



Read Chapter 7 for Class
preparation

COMP 6005 An Introduction to Computing
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Session Two: Computer Hardware

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Links


Reference


Discovering Computers 2005

by Shelly,
Cashman and Vermaat



Of Interest


http://www.indigoimage.com/count/


http://www.hp.com/large/ipg/mobileprint
.html


http://wearables.cs.bris.ac.uk/index.htm