Input & Output
Input
Input is any data and instructions entered into the memory of a computer
Commonly used input method
Keyboard
is an input device that contains keys users press to enter data and instructions into a computer or mobile device
Most desktop compuer keyboard has...
Typing area, function keys, toggle key, directional key, media control buttons, internet control buttons
Pointing device
A pointer is a small symbol on the screen whose location and shape change as a user moves a pointing device
A mouse is a pointing device that fits under the palm of your hand comfortably, such as:
Optical mouse, laser mouse, and touch mouse
Touchpad
Pointing stick
Trackball
Touch Screens
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 DV camera that enables a user to
Capture video and still images
Send email messages with video attachments
Add live images to instant messages
Broadcast live images over the Internet
Conduct video conferences
and make video calls
Scanner 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
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 such as:
Optical character recognition (OCR) and
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
1) RFID (radio frequency identification) uses radio signals to communicate with a tag placed in or attached to an object
2) An RFID reader reads information on the tag via radio waves
Magstripe readers read the magnetic stripe on the back of cards such as credit cads and bank cards
1) MICR (magnetic ink character recognition) devices read text printed with magnetized ink.
2) An MICR reader converts MICR characters into a form the computer can process.
3) Banking industry uses MICR for check processing
A data collection device obtains data directly at the location where the transaction or event takes place
Output
Output is the data
that has been processed
into useful form
Commonly used output devices
Display
Printers
Speakers
Headphones
Earbuds
Data Projector
Interactive whiteboard
Joystick, Wheels, Gamepads and
motion sensing
game controllers
Headphones are speakers that cover or placed outside of the ear
A type of earphone 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
Considered output devices when they include force feedback
Technology that sends resistance to the device in response to actions of the user
Many users attach surround sound speakers or speaker systems to their computers, game consoles, and mobile devices to generate higher-quality sounds
An interactive whiteboard is a touch-sensitive device, resembling a dry-erase board, that displays the image on a connected computer screen
A printer produces text and graphics on a physical medium
A display visually conveys text, graphics, and video information
A monitor is a display that is packaged as a separate peripheral device
LCD monitor
Quality of displays depens on
Resolution
Response Time
Brightness
Dot Pitch
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
A HDMI port
A Display Port
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
Type Of Printers
All-In-One Printers
Plotters
Label Printers
Mobile Printers
Photo Printers
Thermal Printers
Ink- Jet Printers
Large Format Printers
forms characters and graphics by spraying tiny drops of liquid ink onto a piece of paper
A photo printer produces lab-quality pictures
An all-in-one printer is a single device that prints, scans, copies, and in some cases, faxes
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
Laser Printer
Plotters are used to produce high-quality drawings
Large-format printers create photo-realistic quality color prints
Impact Printers
Impact printers form characters and graphics on a piece of paper by striking a mechanism against an inked ribbon that physically contacts the paper