CHAPTER 7 : INPUT AND OUTPUT

INPUT

• ·         Any data and instructions entered into the memory of a computer

Commonly used in :

Devices	Description	Example
Keyboard	Input device that contains keys users press to enter data and instructions into a computer or mobile device.	Ergonomic keyboard  Design to reduces the chance of repetitive strain injuries Incorporates comfort, efficiency, and safety into the design of the workplace.
Pointing devices	Pointer with a small symbol on the screen whose location and shape change as a user moves a pointing device.	Mouse A pointing device that fits under the palm of your hand comfortably. Example : Optical mouse, laser mouse, and touch mouse. Touchpads A small, flat, rectangular pointing device that is sensitive to pressure and motion. Pointing Stick A pressure-sensitive pointing device shaped like a pencil eraser that is positioned between keys on a mobile computer keyboard Trackball A stationary pointing device with a ball on its top or side
Pen Input	Easier for users to touch on a flat surface using a stylus or digital pen to write, draw, or make selections.	Graphics Tablet 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	Known as gesture recognition, users can guide on-screen elements using air gestures	Joysticks, wheels, gamepads Technology that sends resistance to the device in response to actions of the user
Voice Input	The process of entering input by speaking into a microphone	Speech recognition  The computer or mobile device’s capability of distinguishing spoken words
Audio Input	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	The process of capturing full-motion images and storing them on a computer or mobile device’s storage medium	Webcam Digital video (DV) camera that can :  Capture video and still images Send email messages with video attachments Add live images to instant messages Broadcast live images over the Internet Make video calls Conduct videoconferences
Scanners and Reading Devices	A light-sensing input device that reads printed text and graphics and then translates the results into a form the computer can process	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 Bar code reader ·         Known as bar code scanner uses laser beams to read bar codes 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 card , bank card and other card.

OUTPUT

·         Data that has been processed into a useful form.

Output Devices

Display -   Visually conveys text, graphics, and video information	Monitor ·         A display that is packaged as a separate peripheral device such as LCD monitor ·         To display a high quality image monitor should plug into: 1.  A DVI port 2.  An HDMI port 3.  A Display Port HDTV The most advanced form of digital television that the user uses home as display. Data projector  Device that takes the text and images displaying on a computer or mobile device screen and projects them on a larger screen
Printer - Produces text and graphics on a physical medium	Nonimpact printer Forms characters and graphics on a piece of paper without actually contacting the paper. Example :- Ink-jet printer - forms characters and graphics by spraying tiny drops of liquid ink onto a piece of paper Laser Print       - A high quality printer that produce a high quality copy.          All-in-one printer  - A single device that prints, scans, copies, and in some cases, faxes  Thermal printer - Generates images by pushing electrically heated pins against the heat-sensitive paper  Mobile printer - Allows a mobile user to print from a mobile device Label - A small printer that prints on an adhesive-type material that can be placed on a variety of items
Speakers -   Attach surround sound and generate higher-quality sounds	Headphones  Speakers that cover or are placed outside of the ear. Earbuds (also called earphones) Rest inside the ear canal to make users listen sharply.
Assistive Technology Input and Output	Braille input Braille printer