Input, Chapter 4Input, Chapter 4

ITSC 1401, Intro to ComputersInstructor: Glenda H. Easter

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.

04/19/23

Parts of a Parts of a KeyboardKeyboardAlphanumeric KeysModifier KeysNumeric KeypadFunction KeysCursor-movement KeysEscape KeySpecial-purpose Keys

The KeyboardThe Keyboard

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.

Additional Input Additional Input DevicesDevicesBiological feedback devicesChemical detectors

Virtual reality programs use

helmets to enable users to “move” through

a simulated “world.”