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CHAPTER 3 INPUT AND OUTPUT - Coggle Diagram
CHAPTER 3 INPUT AND OUTPUT
Input devices convert what we understand into what the system unit can process.
OUTPUT DEVICES
MONITOR
Known as screens or display screen and present visual images of text and graphics.
Features
resolution
clarity/pixels
dot pitch
contrast ratios
size
aspect ratio
Monitor Types
Flat-panel monitors
require less power to operate
Portable and thin and most are backlit.
Three basic types:
LCD (Liquid Crystal Display)
LED (Light Emitting Diode)
OLED (Organic Light Emitting Diode)
Curved Monitors
Has a concave screen that provides better viewing angles near the edges of the screen.
E-book Readers
(Electronic books) are traditional printed books in electronic format. E-book readers store and display e-books and other electronic media. They use e-ink technology.
Other Monitors
digital (interactive) whiteboards
ultra-high-definition television (UHDTV)
digital projectors
PRINTERS
Translate information processed by the system unit and present the information on paper.
Features
Resolution
Color
Speed
Memory
Duplex printing
Printer Types
Laser
uses a laser light beam to produce images
fast, excellent quality
Personal or shared
Other Printers
Cloud printers (Google Cloud Print is a cloud printing service).
Thermal printers (use heat element to produce images on heat-sensitive paper)
Plotters (use data from graphics tablets and other graphical devices).
3D Printers
create 3-D shapes with a thin layer of material repeatedly until created
Additive manufacturing
Ink-jet
printers spray in at high speed
Reliable, quite and inexpensive
AUDIO AND VIDEO DEVICES
Translate audio information form the computer into sounds that people can understand
E.g Speakers and headphones
Bluetooth Technology
Wireless technology
Used to connect to speakers and headsets
COMBINATION INPUT AND OUTPUT DEVICES
Virtual reality (VR)
Created in 3D through computers for a virtual experience
Headgear with gloves have sensors to collect data that work with software
Drones (unmanned aerial vehicles, UAV
Take input form a controller and send back video and sound to the user
Very cost effective now
Multifunctional devices (MFD)
Cost efficient but lower quality
Robots
Use microphones, cameras and other sensors as input
Output is dependent on the use for the robot
Assists in surgery
Headsets - combine the functionality of microphones and headphone
Telephones
Known as telephony and internet telephony
Voice-over IP (VoIP)
Hangouts
Face Time
Skype
ERGONOMICS
Study of human factors related to things people use
Fit the task to the user to avoid:
Eyestrain and headache
Back and neck pain
Repetitive strain injury
Ergonomic Challenged Devices
Portable devices are not set up for ergonomics
Laptops
Because the keyboard and monitor are connected, they cannot be set up ergonomically
Tablets
Tablets hunch is caused by the users head being improperly aligned to the viewing surface
Smartphones
Blackberry thumbs results form using thumbs to type on a tiny keyboard
A LOOK TO THE FUTURE AUGMENTED REALITY DISPLAYS
With wearable augmented reality displays, data form your computer and the internet will be instantly viewable
Funding for development form the government has begun to assist soldiers and pilot
Google has develop a prototype, "project glass" , that is being tested.
INPUT DEVICES
Any data or instructions used by a computer
Input devices translate data into a form that the system unit can process
Some hardware input devices include:
Keyboards
Mice
Pointing
Scanning
Image capturing
Audio-input
Keyboards
Laptop Keyboards
Virtual keyboards
Traditional keyboards
Thumb keyboard
Scanning Devices
Scanning devices move across text and images to convert them into a form that the system unit can process.
Bar Code Readers
Contain photo-electric cells that scan or read bar codes or the zebra striped marks printed on product containers
Wand Readers
UPCs and MaxiCode readers
RFID Readers
radio-Frequency Identification (RFID) is tiny chips embedded (tags) in most anything (object) contain electronically sored information that can be read using an RFID reader located several yards away.
Card Readers
Interpret encoded information that is stored on debit, credit and identification cards
Character and Mark Recognition Devices
Recognize special characters and marks
Magnetic-ink character recognition (MICR)
Optical-character recognition (OCR)
Optical-mark recognition (OMR)
Optical Scanners
Flatbed scanners
Document scanners
Portable scanners
3D scanners
NFC Readers
(near field communication) is a protocol, based on RFID that defines how a network uses close-range radio signals to communicate between two devices or objects equipped with NFC technology
Pointing Devices
Provide an intuitive interface with the system unit by accepting physical movements or gestures and converting them into machine-readable input.
Mouse
Optical Mouse
Has no moving parts
Emits and senses light to detect mouse movement
Can be used on any surfaced
Wireless mouse
Battery operated
Uses radio waves or infrared light waves
Touch Pads
Controls pointer by moving and tapping your fingers on the surface of the pad
Touch Screen
Can be touched with more than one finger
Common on mobile devices
Apple iPhone
Notebook computers
Desktop monitors
Game Controllers
Provide input to computer games
Joystick use pressure and direction of the stick
Gaming mice are similar to a mouse but high precision
Game pads use both hands
Motion sensing device control games by user movement
Stylus
Use on tablets
Uses handwriting recognition software
IMAGE CAPTURING DEVICES
Image capturing devices create or capture original images. These devices include digital cameras and webcams.
Digital Camera
Capture images digitally and store in memory
Webcams
are specialized digital video cameras that capture images and send them to a computer for broadcast over the Internet
AUDIO-INPUT DEVICES
Audio-input devices convert sounds into a form that can be processed by the system unit. By far the most widely used audio-input device is the microphone.
Voice Recognition Systems
BIOMETRICS AUTHENTICATES DEVICES
A biometric device authenticates a person's identity by translating a personal characteristic into a digital code that is compared with a digital code in a computer or mobile device verifying a physical or behavioral characteristic
Unauthorized Access and Use
Fingerprint reader
Face recognition system
Hand geometry system
Voice verification system
Signature verification system
Iris recognition system
Output devices convert what the system unit as processed into a form that we can understand.