24. The speech synthesizer of claim 11 further including circuit means for adding a relatively high fixed frequency formant to said voiced excitation signal to increase the excitation energy of said voiced excitation signal at high frequencies.
24. The speech synthesizer of claim 11 further including circuit means for adding a relatively high fixed frequency formant to said voiced excitation signal to increase the excitation energy of said voiced excitation signal at high frequencies. 29. The speech synthesizer of claim 24 wherein said plurality of resonant filters in said vocal tract means are connected in cascaded form.