45. The system of claim 44 , wherein the means for determining the state of the user based upon the utterance comprises: means for generating an utterance parameter vector based upon the utterance parameters; means for converting the utterance parameter vector to an indication representing the state of the user; and means for determining the state of the user based upon the indication.
45. The system of claim 44 , wherein the means for determining the state of the user based upon the utterance comprises: means for generating an utterance parameter vector based upon the utterance parameters; means for converting the utterance parameter vector to an indication representing the state of the user; and means for determining the state of the user based upon the indication. 46. The system of claim 45 , wherein the means for converting the utterance parameter vector to the indication applies a function to the utterance parameter vector to generate one of a scalar, a vector of fuzzy classes, and an index representing the state of the user.