17. A system for recognizing speech, comprising: a speech recognizer configured to analyze speech input and generate a hypothesis and a confidence factor associated with the hypothesis; an acceptance algorithm operable for comparing the confidence factor to an acceptance threshold for accepting or rejecting the hypothesis; an adjustment component, coupled with the acceptance algorithm, and operable for comparing the hypothesis to an expected response and if the comparison is favorable, adjusting the acceptance threshold used by the acceptance algorithm in order to affect the acceptance of the hypothesis.
19. The system of claim 17 wherein the adjustment component is further operable for decreasing the acceptance threshold based on the favorable comparison of the hypothesis to the expected response.