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INPUT AND OUTPUT

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Competencies

Define input

Describe keyboard entry, pointing devices, & scanning devices

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

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Competencies cont.

Define output

Describe monitors, printers, and audio output devices

Discuss combination input & output devices

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What is Input?

Any data or instructions used by a computer

Input devicesHardware

Keyboards

Mice

Scanners

Other devices

Translates data into a form that the system unit can process

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Keyboard Entry

KeyboardsTraditional keyboards

Flexible keyboards

Ergonomic keyboards

Wireless keyboards

PDA keyboards

FeaturesTypewriter keyboard with numeric pad

Special purpose keys

Toggle and combination keys

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Traditional Keyboard

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Pointing Devices

MouseMechanical

Optical

Cordless or wireless

Joystick

Touch Screen

Light Pen

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Scanning Devices

Optical scannersFlatbed

Portable

Bar code readersHandheld wand readers or platform scanners

Contain photoelectric cells that read bar codes

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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)

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Image Capturing Devices

Digital cameraImages recorded digitally on a disk

Images can be downloaded to a computer

Digital video camera Records motion digitally

Can take still images as well

WebCamsSpecialized digital video cameras

Broadcast images over the Internet

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Digitizing Devices

Graphics Tablets

Digital Notepads

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Audio Input Devices

VoiceVoice recognition systems

Discrete-speech recognition systems

Continuous-speech recognition system

MusicMusical Interface Digital Interface (MIDI)

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What is Output?

Processed data or information

Types of outputText

Graphics

Audio & video

Output devicesMonitors

Printers

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Monitors

Known as screens or display screens

Output referred to as soft copy

Features Resolution

Dot pitch

Refresh rate

Size

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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

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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

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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

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Printers

Translates information that has been processed by the system unit

Output referred to as hard copy

FeaturesResolution

Color capability

Speed

Memory

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Printers

Ink-jet printer

Laser printerPersonal laser printers

Shared laser printers

Thermal printer

Other printersDot-matrix

Plotters

Photo printers

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Audio Output Devices

Translates audio information into sounds that people can understand

Common devicesSpeakers

Headphones

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Combination Input and Output Devices

Fax machines

Multifunction devices

Internet telephonesTelephony

Voice-over IP (VoIP)

Terminals

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Terminals

An input and output device

Connects to a mainframe or server

Types of terminalsDumb terminal

Intelligent terminal

Network terminal

Internet terminal

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A Look to the FutureNeural Signals Inc.

Brain machine interface

Allows humans to control machines with their thoughts

Individuals incapable of communication

Physically immobile people