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Input-Output

Input Devices
by

abbey Diolan

on 25 January 2013

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Transcript of Input-Output

COMPETENCIES Define input.
Describe keyboard entry including different types of keyboards and keyboard features.
Discuss pointing devices including mice, touch screens, joysticks and styluses .
Describe scanning devices including optical scanners and card readers . Pointing Devices Scanning Devices Input and Output Keyboard Entry Keyboards convert numbers, letters and special characters that people understand into electrical signals. Scanning devices convert scanned text and images into a form that the system unit can processs. abbey faye y. diolan Character and Mark
Recognition Devices What is INPUT? Input is any data or instruction that are used by a computer. Input Devices are hardware used to translate words, sounds, images and actions that people understand into a form that the system unit can process.
are essentially translators. ** Most keyboards use an arrangement of keys given the QWERTY. ** Types of
Keyboards Features combines with a numeric keypad
It also has special-purpose keys such as CAPS LOCK keys and CTRL keys Traditional Keyboards Ergonomic Keyboard Wireless
Keyboard PDA
Keyboards Virtual Keyboards What are some
examples of
INPUT Devices? Pointing devices provides intuitive interface with the system unit by accepting pointing gestures and converting them into machine-readable input. Mouse mouse pointer A mouse controls a pointer that is displayed on the monitor. Optical Mouse has no moving parts and is currently thet most widely used.
it emits and senses light to detect muse movement Mechanical Mouse has a ball on the bottom and is attached with a cord to the system unit. Cordless or
Wireless Mouse a battery-powered device that typically uses radio waves or infrared light waves to communicate with the system unit. 3 Devices that are simiar to a mouse are: Trackball or Roller Ball Touch pads Pointing stick Touch Screens allows users to select actions or commands by touching the screen with finger or penlike device MULTITOUCH SCREENS can be touched with more than one finger, which allows for interactions such as rotating graphical objects on the screen with you hand or zooming in
and out by pinching an
stretching your
fingers. Joystick is a popular input device for computer games. Stylus is a pen-like device commonly used with Tablet PCs and PDAs. A stylus uses pressure to draw images on a s creen There are four types of scanning devices: Optical scanner, card readers, bar code readers and character and mark recognition devices. Optical Scanner also simply known as a scanner, accepts documents consisting of text and/or images and converts them to machine-readable form. these devices do not recognize individual letters or images rather, they recognize light, dark and colored areas that make up individual letters and images. Flatbed Scanner is much like a copy machine. The image to be scanned is placed on a glass surface and the scanner records the image from below. Document Scanner is similar to a flatbed scanner except that it can quickly scan multipage documents. It automatically feeds one page of a document at a time through a scanning surface. Portable Scanner is typically a handheld device that slides across the image, making direct contact. Card Readers card readers interpret encoded information (such as user's name , identification nos., and signture) that are typically embossed on cards lie credit card, debit card, access card and/or some type of identification card. Magnetic
Card Readers the encoded information is stored on a thin magnetic strip located on the back of the card. When the card is swiped through the magnetic card reader, the information is read. Radio Frequency
Card Readers are not as common but more convenient because they do not require the card to actually make contact with the reader. The card has a small RFID(Radio frequency iedntification) microchip that contains the usrs encoded information.Whenever the card is passed within ew inches of the card reader, the user's information is read Bar Code Reader these devices are either handheld wand reader or platform scanners. They contain photoeectric cells that scan or read bar codes, or vertical zebra-striped marks printed on product containers. Character and Mark Recognition Devices are scanners that are abe to recognize special characters and marks. They are specialty devices that are essential tools for certain applications. Magnetic-ink Character Recognition (MICR) used by banks to automatically read those unusual numbers on the bottom of checks and deposit slips. Optical-Character Recognition uses special preprinted characters that can be read by a light source and changed into machine-readabe code.
(eg: wand reader) Optical-mark Recognition senses the presence or absence of a mark, suchf as a pencil mark. OMR is often used to
score
standardized
multiple-choice tests.
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