1. A method of speech synthesis, comprising the steps of: (a) receiving a text input in a text-to-speech system; (b) processing the text input into synthesized speech using a processor of the system; (c) establishing that the synthesized speech is unintelligible; (d) reprocessing the text input into subsequent synthesized speech to correct the unintelligible synthesized speech; and (e) outputting the subsequent synthesized speech to a user via a loudspeaker.
2. The method of claim 1 wherein step (c) includes: (c1) predicting intelligibility of the synthesized speech; and (c2) determining that the predicted intelligibility from step (c1) is lower than a minimum threshold.