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PRESENTED BY:-RISHI KUMRA

ANIRBAN

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What is an Input Device?

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Input Device are.

Any peripheral (piece of computerhardware equipment) used to providedata and control signals to aninformation processing system (such asa computer )

Machine that we use to put informationor feeds data INTO the computer .

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What are different types ofcomputer input devices?

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Various types of Input Devices are:-

Keyboard devicesPoint-and-draw devicesData scanning devicesDigitizerElectronic cards based devicesVoice recognition devicesVision based devicesOffline data entry devices

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KEY BOARD DEVICES

General-purpose Keyboards They haveenough keys to make them useful forany type of application. It wasintroduced by IBMSpecial-purpose Keyboards They havespecial purpose keyboards to enablefaster data entry and rapid interactionwith computer systems

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Point-and-draw devices

Trackball Requires less space than a mouseElectronic Pen It is of 2 types i.e. light pen &writing pen with pad

Touch Screen It enables the users to choosefrom available options by simply touchingwith their finger the desired icon or menuitem displayed on the computers screen.

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Mouse It rolls on a small bearing andhas one, two or three buttons on the top .

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Data Scanning Devices

Image Scanner It translates paperdocuments into an electronic format that canbe stored in a computer.

Optical Character Recognition (OCR) Thescanner is equipped with a characterrecognition software that converts the bit mapimages of characters to equivalent ASCII

codes.Optical Mark Reader These scanners arecapable of recognizing a pre specified markmade by pencil or pen.

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Some more Data ScanningDevices

Bar-Code Reader It is used for uniqueidentification of all types of goods, tagsetc.Magnetic-Ink Character Recognition(MICR) It is used by the bankingindustry for faster processing of the large

volumes of cheques being handled everyday by this industry

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DIGITIZER

Used for digitizing pictures,maps &drawings into digital form for storage in

computers.Consists of digitizing tablet associatedwith a stylus

It is mostly used in the area of ComputerAided Design(CAD) & GeographicalInformation System(GIS)

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ELECTRONIC CARDREADER

Mainly used for direct data entry intocomputer system

Electronic cards are of 2 types:-1. Magnetic strip card - have a magnetic

strip on its back

2. Smart card - have a built inmicroprocessor chip

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VOICE RECOGNITION DEVICE

Computer with this device consist of amicrophone/telephone & follows the followingsteps:-

1. Speak

2. Convert into electrical signals (analog form)3. Digitize (digital form)

4. Match with pre-stored words5. Perform corresponding actions

These devices are classified into 2 categories:-1. Speaker dependent

2. Speaker independent

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VISION-INPUT DEVICE

It allows a computer to accept just by seeingan object.It consist of a digital camera & follows the

following steps to recognize a given object:-1. Focused on a object to take a picture2. Creates an image in a digital form so that it

can be stored & interpreted by the computer3. Matched with the pre-stored images in the

computers image database 4. Depending whether the match is found or not

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OFF-LINE DATA ENTRYDEVICE

Data entry is a process of transforminginput data into a form the computersystem can store & interpret

Maybe carried out in offline or onlinemanner

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Difference between

1. Writing pen with pad & Digitizer2. Magnetic strip card & Smart card

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