First International Conference on Spoken Language Processing (ICSLP 90)
Because of simplification in the realization of both the vocal tract transfer functions and the excitation sources, certain limitations exist in the quality of speech synthesized by conventional terminal analog speech synthesizers. In order to realize high quality synthesis of speech, a new type of terminal analog synthesizer has been developed consisting of four paths of cascade connection of pole/zero filters and three types of source waveform generators. The four separate paths simulate the vocal tract transfer functions of the four different speech categories: the vowels and vowel-like sounds, the nasal murmur and the buzz bar, the frication and the plosion. Configuration of each path has been decided based on the results of analysis of natural utterances. The generators produce voicing source waveforms, white Gaussian noise waveforms, and impulse-like waveforms. The quality of synthesized speech, especially stop consonants, has indicated the advantage of the proposed synthesizer over the conventional ones.
Bibliographic reference. Fujisaki, Hiroya / Hirose, Keikichi / Asano, Yasuharu (1990): "Proposal and evaluation of a new type of terminal analog speech synthesizer", In ICSLP-1990, 329-332.