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Input, Chapter 4

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Input, Chapter 4 ITSC 1401, Intro to Computers Instructor: Glenda H. Easter Objectives Describe the four types of input. List the characteristics of a keyboard. – PowerPoint PPT presentation

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Date added: 9 December 2019
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Title: Input, Chapter 4


1
Input, Chapter 4
  • ITSC 1401, Intro to Computers
  • Instructor Glenda H. Easter

2
Objectives
  • Describe the four types of input.
  • List the characteristics of a keyboard.
  • Identify various types of keyboards.
  • Identify various types of pointing devices.
  • Explain how a mouse works.
  • Describe different mouse types.

3
Objectives (Continued)
  • Explain how scanners and other reading devices
    work.
  • Identify the purpose of a digital camera.
  • Describe the various techniques used for audio
    and video input.
  • Identify alternative input devices for physically
    and challenged users.

4
What Is Input?
  • Input is any data or instructions you enter into
    the memory of a computer.
  • There are four types of input
  • Data
  • Program
  • Command
  • User Response

5
Four Types of Input
  • Input Types
  • Data A collection of unorganized facts
  • Program A series of instructions that tells a
    computer how to perform a task.
  • Command An instruction given to a computer
    program.
  • User response An instruction you issue to the
    computer by replying to a question posed by a
    computer program

6
Common Input Devices
  • Keyboard
  • Mouse
  • Trackball
  • Joystick
  • Pen Input
  • Light Pens
  • Digitizing Tablets

QWERTY
DVORAK
7
Inputting Data
  • You can enter data into the computer in two
    methods.
  • You can use keyboard , which is the traditional
    manner to input.
  • Or you can use direct input, using a pointing
    device such as a mouse, scanner, or pen devices.

8
Input Keyboard
  • Input devices take data and programs people can
    read or understand and convert them to a form the
    computer can process.
  • Keyboard Entry This looks like a typewriter
    keyboard but has additional keys.
  • With keyboard entry, users enter data through the
    keyboard from source documents.

9
Parts of a Keyboard
  • Alphanumeric Keys
  • Modifier Keys
  • Numeric Keypad
  • Function Keys
  • Cursor-movement Keys
  • Escape Key
  • Special-purpose Keys

10
The Keyboard
11
A Pointing Device A Mouse
The mouse is a fairly intuitive input device.
12
Pointing Devices
  • Mouse operations
  • Clicking
  • Dragging
  • Double-Clicking

click
click
click
13
Other Input Devices
  • Touch-Sensitive Screens
  • Scanning Devices
  • MICR
  • Bar Code Readers
  • OMR
  • Voice Input Devices
  • Video Digitizers

14
Additional Input Devices
  • Soundcards
  • Microphones Speech Recognition
  • Video Capture Cards
  • Cameras
  • Scanners

Handheld scanner
15
Input Direct Entry
  • With this method, data is made into
    machine-readable form as it is entered.
  • No keyboard is used.
  • Data can be entered through scan devices which
    reflect lights on characters of data.

16
Direct Entry (Continued)
  • Scanning Devices (Continued)
  • Facsimile Transmission Machines (FAX) Transfers
    documents at electronic speeds. ? Encodes image
    as a series of instructions representing
    black-and-white image areas.

17
Direct Entry (Continued)
  • Scanning Devices (Continued)
  • Bar-Code Readers Commonly used in grocery
    stores to read the UPC (Universal Produce Codes).
  • Character and Mark Recognition Devices ?
    Magnetic-Ink Character Recognition (MICR)
    Reads bottom of checks

18
More Scanning Devices
  • Scanning Devices (Continued)
  • Character and Mark Recognition Devices
    (Continued) ?Optical-Mark Recognition (OMR)
    or mark sensing. These are the Scantrons
    that you purchase for use on tests.

19
More Scanning Devices
  • Scanning Devices (Continued)
  • Character and Mark Recognition Devices
    (Continued) ? Optical-Character Recognition
    (OCR) Reads special preprinted characters
    through a light source and changes them into
    machine- readable code. This is the type of
    scanner that is used in department stores.

20
Optical Scanners
  • When a document is scanned, the results are
    stored in rows and columns of dots called a
    bitmap.

21
Additional Input Devices
  • Biological feedback devices
  • Chemical detectors

Virtual reality programs use helmets to enable
users to move through a simulated world.
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