7. A computerized speech synthesizer according to claim 6 comprising a differential phoneme database, the differential phoneme database comprising multiple phonetic modification parameters to change the prosody of individual acoustic phonemes in the phoneme database and enable the prosodic speech signal to be audibilized with different prosody styles.
7. A computerized speech synthesizer according to claim 6 comprising a differential phoneme database, the differential phoneme database comprising multiple phonetic modification parameters to change the prosody of individual acoustic phonemes in the phoneme database and enable the prosodic speech signal to be audibilized with different prosody styles. 8. A computerized speech synthesizer according to claim 7 wherein the phonetic modification parameters are derived from acoustical recordings of a trained speaker.