Computer Fundamental

Special Input Devices

Bar Code Readers

A bar code is a specialized code represented by sets of parallel bars of varying thickness and separation. This is used for fast identification of items with an optimal scanner. The optical scanner is called a bar code reader. The bar code reader is a photoelectric scanner that read the bar code.

Magnetic Data Entry

MICR Reader

There are two technologies in magnetic data entry. A magnetic ink character recognition (MICR) technology reads iron oxide ink preprinted or encoded on checks, deposit slips or on documents. An MICR reader electronically captures data, by first magnetizing the magnetic ink characters and then sensing the signal.

Magnetic Stripe Reader

Another form of magnetic data entry is the magnetic stripe technology that makes computers read credit cards. The dark magnetic stripe on the back of credit cards is the iron oxide coating. A magnetic stripe reader reads this magnetic stripe.

Voice and Video Data Input Devices

Mike

A mike can be used to input sound (user voice etc) into computer and can be used with voice based application or record sound and in varity of ways where there is a need of sound.

Digital Camera

A digital camera is an electronic device used to capture and store photographs electronically instead of using photographic film like conventional cameras.

Web Camera

A webcam is a real-time camera whose images can be accessed using the World Wide Web, instant messaging, or a PC video calling application. Normally used in video chatting or video calling etc.