Formant Synthesis

  • There is a direct correspondence between a set of formant frequencies and a vowel.

  • The synthesized vowel gives a perception of the expected vowel, except for the loss of naturalness.

  • The loss of naturalness is mainly due to the approximation of the speech production mechanism by a source-system model.

  • The system is approximated as an all-pole system which is reasonable for vowel sounds which do not have significant anti-resonances.

  • The excitation source represented by a train of impulses is not a good approximation and better models of excitation are required to gain naturalness.