1) Light Pen
2) Graphic Digitizer
3) Magnetic-Ink Character Recognition (MICR)
4) Optical Mark Recognition (OMR)
A microphone is a speech recognition device. Speech recognition is one of the most
interactive system to communicate with the computer. The user can simply instruct the computer about the task to be performed with the help of a microphone. It is the technology by which sounds, words or phrases spoken by humans are converted into digital signals, and these signals are transformed into the computer generated texts or commands. Most speech recognition systems are speaker-dependent so they must be separately trained for each individual user.