This provides a human voice that sounds similar to the person used for the vocal tracts. When a word in this list is encountered a recorded word is substituted.Īlternatively, a synthesizer can incorporate a model of the vocal tract and other human voice characteristics to create a completely "synthetic" voice output. For example a diphone system may have a list of keywords that are often mispronounced. Systems differ in the size of the stored speech units a system that stores phones or diphones provides the largest output range, but may lack clarity. Synthesized speech can be created by concatenating pieces of recorded speech that are stored in a database. TTS can be accomplished by software or hardware. In most cases the voice has a distinctly computer like sound but some of the newer technologies support very human like voices. There are several different techniques used to create the voice. TTS creates sound by interpreting electronic text and then synthesizing the voice.
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