18. In an automotive vehicle equipped with a text-to-speech (TTS) control system adapted to adjust characteristics of a TTS voice in response to a measured state of the automotive vehicle, a method of adjusting at least one TTS voice characteristic while reducing distraction to an operator of the automotive vehicle includes the steps of: measuring at least one operating state of the automotive vehicle; calculating a value of at least one parameter characterizing the TTS voice to produce a calculated value based on the measured operating state of the automotive vehicle such that intelligibility of the TTS voice would be increased; processing a message to be synthesized by the TTS voice synthesizer to detect at least one break within the message to be synthesized; storing a processed value in a memory device wherein the processed value is equal to a previous value of the at least one parameter if the at least one break is not yet detected and is equal to the calculated value if the at least one break is detected; and applying the processed value to a TTS voice synthesizer.
18. In an automotive vehicle equipped with a text-to-speech (TTS) control system adapted to adjust characteristics of a TTS voice in response to a measured state of the automotive vehicle, a method of adjusting at least one TTS voice characteristic while reducing distraction to an operator of the automotive vehicle includes the steps of: measuring at least one operating state of the automotive vehicle; calculating a value of at least one parameter characterizing the TTS voice to produce a calculated value based on the measured operating state of the automotive vehicle such that intelligibility of the TTS voice would be increased; processing a message to be synthesized by the TTS voice synthesizer to detect at least one break within the message to be synthesized; storing a processed value in a memory device wherein the processed value is equal to a previous value of the at least one parameter if the at least one break is not yet detected and is equal to the calculated value if the at least one break is detected; and applying the processed value to a TTS voice synthesizer. 19. The method of claim 18 , wherein the step of processing a message to be synthesized further comprises the step of identifying at least one control character within the message indicating the at least one break.