CHAPTER 7: INPUT AND OUTPUT
CHAPTER 7: INPUT AND OUTPUT
Optical character recognition (OCR)
A non-impact printer forms characters and graphics on a piece of paper without actually contacting the paper
WHAT IS INPUT
Input is any data and
instructions entered into the memory of a computer.
Keyboards
A keyboard is an input
device that contains keys users press to enter data and instructions into a
computer or mobile device
Most desktop computer
keyboards have…
- Typing area
- function keys
- Toggle keys
- Directional keys
- Media control buttons
- Internet control button
An ergonomic keyboard
has a design that reduces the chance of repetitive strain injuries
Ergonomics incorporates
comfort, efficiency, and safety into the design of the workplace
Pointing Devices
A mouse is a pointing
device that fits under the palm of your hand comfortably
Optical mouse, laser
mouse, and touch mouse
Touch Screens
A touch screen is a
touch-sensitive display device
Pen Input
With pen input, you
touch a stylus or digital pen on a flat surface to write, draw, or make
selections
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
Motion Input
With motion input,
sometimes called gesture recognition, users can guide on-screen elements using
air gestures
Voice 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
Audio 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
Video Input
Video input is the
process of capturing full-motion images and storing them on a computer or
mobile device’s storage medium
A webcam is a type of
digital video (DV) camera that enables a user to:
- Capture video and still images
- Send email messages with video attachment
- Add lives images to instant messages
- Broadcast live over the internet
- Conduct videoconferences
- Make Video calls
A video conference is a
meeting between two or more geographically separated people
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
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 mark recognition (OMR)
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
Magstripe readers
read the magnetic stripe on the back of cards such as:
- Credit cards
- Entertainment cards
- Bank cards
- Identification cards
- Others similar cards
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
What Is Output?
Output is data that has
been processed into a useful form
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
The quality of a
display depends primarily on its:
- Resolution
- Response time
- Brightness
- Dot pich
- Contrast ratio
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
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
Printers
A printer produces text
and graphics on a physical medium
A non-impact printer forms characters and graphics on a piece of paper without actually contacting the paper
- Inkjet printers
- Photo printers
- Laser printers
- Thermal printer
- Mobile printers
- Plotters
- All in one printers
- Large format printers
Laser printer can print in high speed with variety color or plain black and white.
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.
An all-in-one printer
is a single device that prints, scans, copies, and in some cases, faxes
Sometimes called a
multifunction printer
A thermal printer
generates images by pushing electrically heated pins against the heat-sensitive
paper
A mobile printer is a
small, lightweight, battery-powered printer that allows a mobile user to print
from a mobile device
A label printer is a
small printer that prints on an adhesive-type material that can be placed on a
variety of items
Plotters are used to
produce high-quality drawings
Large-format printers
create photo-realistic quality color prints
Impact printers form characters
and graphics on a piece of paper by striking a mechanism against an inked
ribbon that physically contacts the paper
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
Headphones are speakers
that cover or are placed outside of the ear
Earbuds (also called
earphones) rest inside the ear canal
A data projector is a
device that takes the text and images displaying on a computer or mobile device
screen and projects them on a larger screen
Joysticks, wheels,
game pads, 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
Assistive Technology
Input and Output
Head mounted pointer Braille printer
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