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17 Νοε 2013 (πριν από 4 χρόνια και 1 μήνα)

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7

INPUT AND
OUTPUT

© 2005 The McGraw
-
Hill Companies, Inc. All Rights Reserved.

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2


Competencies


Define input

Describe keyboard entry, pointing devices, &
scanning devices

Discuss image capturing devices, digitizing
devices, & audio input devices

© 2005 The McGraw
-
Hill Companies, Inc. All Rights Reserved.

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3


Competencies

cont.


Define output

Describe monitors, printers, and audio output
devices

Discuss combination input & output devices

© 2005 The McGraw
-
Hill Companies, Inc. All Rights Reserved.

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What is Input?

Any data or instructions used by a computer

Input devices

Hardware

Keyboards

Mice

Scanners

Other devices

Translates data into a form that the system unit can
process

© 2005 The McGraw
-
Hill Companies, Inc. All Rights Reserved.

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Keyboard Entry

Keyboards

Traditional keyboards

Flexible keyboards

Ergonomic keyboards

Wireless keyboards

PDA keyboards

Features

Typewriter keyboard with numeric pad

Special purpose keys

Toggle and combination keys

© 2005 The McGraw
-
Hill Companies, Inc. All Rights Reserved.

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Traditional Keyboard

© 2005 The McGraw
-
Hill Companies, Inc. All Rights Reserved.

7
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Pointing Devices

Mouse

Mechanical

Optical

Cordless
or wireless

Joystick

Touch Screen

Light Pen

© 2005 The McGraw
-
Hill Companies, Inc. All Rights Reserved.

7
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Scanning Devices

Optical scanners

Flatbed

Portable


Bar code readers

Handheld wand readers or platform scanners

Contain photoelectric cells that read bar codes

© 2005 The McGraw
-
Hill Companies, Inc. All Rights Reserved.

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Scanning Devices

Character and mark recognition devices

Scanners that recognize special characters &
marks

Magnetic ink character recognition (MICR)

Optical
-
character recognition (OCR)

Optical
-
mark recognition (OMR)


© 2005 The McGraw
-
Hill Companies, Inc. All Rights Reserved.

7
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10

Image Capturing Devices

Digital camera

Images recorded digitally on a disk

Images can be downloaded to a computer

Digital video camera

Records motion digitally

Can take still images as well

WebCams

Specialized digital video cameras

Broadcast images over the Internet

© 2005 The McGraw
-
Hill Companies, Inc. All Rights Reserved.

7
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Digitizing Devices

Graphics Tablets


Digital Notepads

© 2005 The McGraw
-
Hill Companies, Inc. All Rights Reserved.

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Audio Input Devices

Voice

Voice recognition systems

Discrete
-
speech recognition systems

Continuous
-
speech recognition system

Music

Musical Interface Digital Interface (MIDI)

© 2005 The McGraw
-
Hill Companies, Inc. All Rights Reserved.

7
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13

What is Output?

Processed data or information

Types of output

Text

Graphics

Audio & video

Output devices

Monitors

Printers


© 2005 The McGraw
-
Hill Companies, Inc. All Rights Reserved.

7
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14

Monitors

Known as screens or display screens

Output referred to as soft copy

Features

Resolution

Dot pitch

Refresh rate

Size

© 2005 The McGraw
-
Hill Companies, Inc. All Rights Reserved.

7
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15

Monitors

Most frequently used output device

Size is measured by diagonal of screen

Common sizes: 15, 17, 19, 21 inches


Clarity is indicated by resolution

Measured in pixels

More pixels = better clarity

computing
ESSENTIALS












© 2005 The McGraw
-
Hill Companies, Inc. All Rights Reserved.

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Monitor Standards

Resolution capabilities indicated by a monitor’s
standard

Super Video Graphics Array (SVGA)

Extended Graphics Array (XGA)

Super Extended Graphics Array (SXGA)

Ultra Extended Graphics Array (UXGA)

computing
ESSENTIALS












© 2005 The McGraw
-
Hill Companies, Inc. All Rights Reserved.

7
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17

Monitor Types

Cathode
-
Ray Tubes (CRT)

Most common

Flat
-
panel monitors

Passive
-
matrix

Active
-
matrix

eBook readers

Data projectors

High
-
definition television (HDTV)

computing
ESSENTIALS












© 2005 The McGraw
-
Hill Companies, Inc. All Rights Reserved.

7
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18

Printers

Translates information that has been processed
by the system unit

Output referred to as hard copy

Features

Resolution

Color capability

Speed

Memory

© 2005 The McGraw
-
Hill Companies, Inc. All Rights Reserved.

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Printers

Ink
-
jet printer

Laser printer

Personal laser printers

Shared laser printers

Thermal printer

Other printers

Dot
-
matrix

Plotters

Photo printers

© 2005 The McGraw
-
Hill Companies, Inc. All Rights Reserved.

7
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Audio Output Devices

Translates audio information into sounds that
people can understand

Common devices

Speakers

Headphones


© 2005 The McGraw
-
Hill Companies, Inc. All Rights Reserved.

7
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Combination Input and Output
Devices

Fax machines

Multifunction devices

Internet telephones

Telephony

Voice
-
over IP (VoIP)

Terminals

© 2005 The McGraw
-
Hill Companies, Inc. All Rights Reserved.

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Terminals

An input and output device

Connects to a mainframe or server

Types of terminals

Dumb terminal

Intelligent terminal

Network terminal

Internet terminal

© 2005 The McGraw
-
Hill Companies, Inc. All Rights Reserved.

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A Look to the Future

Neural Signals Inc.

Brain machine interface

Allows humans to control machines with their
thoughts

Individuals incapable of communication

Physically immobile people