A microphone can be used to input sound.
The sound is detected by the microphone and an electrical signal is transmitted to the computer. Special hardware is used to convert this analogue data into digital data so it can be stored and manipulated.
In the last few years a number of voice recognition systems have been developed. These packages let the user dictate the text into a computer and then convert the speech to text.
Dictating like this can be much quicker than typing but the software isn't perfect and it can interpret a word incorrectly.
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Click on this link: Microphone