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Speech recognition goes back about twenty five years.
Originally, research was funded by money from the military in the US who were trying to develop some speech interfaces for military equipment. At that time, many institutions looked at different methods of achieving voice recognition. The sampling method sampled different frequencies and tried to relate them to phonetic sound. The statistical approach, pioneered by IBM, has become the standard today and tries to effectively predict the next word that the user will say based on words previously said in context. IBM's ViaVoice gold product is an advanced function speech recognition product that allows the user to navigate around the desktop using their voice or open and close folders with their voice.