This system accepts the spoken words as input data or commands. Human speech is very complex, involving emphasis and facial expressions, so complete voice recognition will not be developed for some time. However, simple commands from one user can be used to control machines. In this way a paralyzed person can operate a wheelchair or control heating and lighting. Sales personnel in the field, surgeons in the operation theaters and workers on airports etc. use such devices. Microphone is a good example of such devices.
VISION INPUT SYSTEM
A computer does not see and interpret an image in the way as human beings do. Digital Stills Cameras capture an image which is stored in memory within the camera. When the memory is full it can be erased and further images captured.
The digital images can then be transfer from the camera to a computer where these can be displayed, manipulated or printed. Web-cam is another example of vision input system used for communication over the Internet.
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It's post good thanks Abdul Rehman
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