1. A method of regulating speech output by a text-to-speech (TTS) system, comprising the steps of: (a) evaluating speech that has been converted from text using an initial speech quality test before presentation to a user; (b) applying a classification test to the evaluated speech if the evaluated speech falls below a threshold based on the initial speech quality test; (c) generating an abnormal speech classification for the evaluated speech; and (d) applying a corrective action to the evaluated speech based on the abnormal speech classification in step (c).