15. The TTS parameter damping module of claim 10 , further comprising a moving-average filter adapted for averaging the value of the at least one TTS voice parameter calculated by the TTS parameter calculation module with values of the at least one TTS voice parameter calculated by the TTS parameter calculation module at previous times.
10. A text-to-speech (TTS) control system for use in an automotive vehicle comprising: at least one vehicle sensor adapted for measuring at least one operating state of the automotive vehicle; a TTS voice synthesizer for synthesizing a TTS voice; a TTS phrase database operatively coupled to the TTS voice synthesizer for providing data to be synthesized, the data comprising at least a plurality of phrases; and a TTS processing engine comprising: a TTS parameter database operatively coupled to the TTS voice synthesizer and adapted for storing at least one TTS voice parameter for controlling a characteristic of the TTS voice; a TTS parameter calculation module operatively coupled to the at least one vehicle sensor and adapted for calculating a value of the at least one TTS voice parameter based on the at least one operating state of the automotive vehicle; a phrase break detector operatively coupled to the TTS phrase database and adapted for detecting at least one break in the plurality of phrases and for controlling an update of the at least one TTS voice parameter stored in the TTS parameter database; and a TTS parameter damping module adapted for filtering the value of the at least one TTS voice parameter calculated by the TTS parameter calculation module and for further controlling the update of the at least one TTS voice parameter stored in the TTS parameter database.