Download - Input, Chapter 4
ObjectivesObjectives
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.
Objectives Objectives (Continued)(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.
What Is Input?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
Four Types of InputFour Types of InputInput 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
QWERTYQWERTY
Common Input DevicesCommon Input DevicesCommon Input DevicesCommon Input Devices
KeyboardMouseTrackballJoystickPen InputLight PensDigitizing
Tablets
DVORAK
DVORAK
Inputting DataInputting 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.
Input: KeyboardInput: 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.
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Parts of a Parts of a KeyboardKeyboardAlphanumeric KeysModifier KeysNumeric KeypadFunction KeysCursor-movement KeysEscape KeySpecial-purpose Keys
Rightclick
The mouse is a fairlyintuitive input device.
When it gets sluggish, turn itover and remove the cover plate.
Carefully clean the ball and rollers.
Leftclick
A Pointing Device: A MouseA Pointing Device: A Mouse
• Mouse operations• Clicking• Dragging• Double-Clicking
Pointing DevicesPointing Devices
click
click
click
Other Input DevicesOther Input Devices
Touch-Sensitive Screens
Scanning Devices– MICR– Bar Code Readers– OMR
Voice Input DevicesVideo Digitizers
Additional Input Additional Input DevicesDevicesSoundcardsMicrophones & Speech RecognitionVideo Capture CardsCamerasScanners
Handheld scanner
Input: Direct EntryInput: 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.
Direct EntryDirect Entry(Continued)(Continued)
Scanning Devices Scanning Devices (Continued):(Continued):Facsimile Transmission Machines
(FAX): Transfers documents at electronic speeds. Encodes image as a series of instructions representing black-and-white image areas.
Direct EntryDirect Entry(Continued)(Continued)
Scanning Devices (Scanning Devices (Continued):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
More Scanning DevicesMore Scanning Devices
Scanning Devices Scanning Devices (Continued):(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.
More Scanning DevicesMore Scanning Devices
Scanning Devices Scanning Devices (Continued):(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.
Optical ScannersOptical Scanners
When a document is scanned, the results are stored in rows and columns of dots called a bitmap.