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The different input devices that we have seen so far , allow communication only through some media. modern computers, however, can understand speech. amicrophone or telephone can be used as an input device, which convert human speech into electric signals.

the signal patterns are compared to a dictionary of patterns which have been previously placed in the storage. when a close match is found a word is recognized and the computer produces the appropriate output. the voice input system are ultra expensive and also not fully reliable.

In voice input systems a telephone or a microphone is used as the input device.

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