Method and apparatus for speech generation from phonetic codes

Details Method and apparatus for speech generation from phonetic codes Method and apparatus for speech generation from phonetic codes

1992-12-30

1995-10-31

MacDonald, Allen R.

395 267, G10L 900

Patent

active

054637155

ABSTRACT:
Speech generation from phonetic code is carried out by a microcomputer based system which stores digitized waveform segments and appropriately joins the segments and outputs them to a digital to analog converter and then to a speaker. An allophone is generated for each phoneme designated by the phonetic codes according to the articulation type of each adjacent phoneme. Each phoneme is classified as neutral, labial, glottal, or medial according to its effect on the articulation of adjacent phonemes. Each phoneme is characterized by at least one center waveform dependent on the phonetic code, and an initial waveform and a final waveform, each of which depend on the phonetic code and the articulation type of the neighboring phoneme. Tables of waveform pointers are accessed according to phonetic code and articulation type, and other tables provide articulation types, times of each waveform portion, transition rate, fricative state, and pitch for each phonetic code. Adjacent waveforms are gradually blended together. Continuously varying center waveforms are afforded by indexing through successive waveform pointers at a given rate during the center phoneme period, the rate and the period being retrieved from the tables.

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"Votrax Real Time Hardware for Phoneme Synthesis of Speech" by: Richard T. Gagnon pp. 175-178, IEEE, Jun. 1978.

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