Speech analyzer and synthesizer using vocal tract simulation

Details Speech analyzer and synthesizer using vocal tract simulation Speech analyzer and synthesizer using vocal tract simulation

1989-06-14

1992-06-09

Shaw, Dale M.

Electrical audio signal processing systems and devices

Monitoring/measuring of audio devices

Loudspeaker operation

381 51, G10L 702

Patent

active

051214342

ABSTRACT:
A speech analyzer and synthesizer uses simulation of the acoustic behavior of a tube divided into portions having variable sections. The section variations of the various portions of the tube generate sounds corresponding to voiced phonemes when an air flow and pressure source is positioned in analogy with human vocal cords. Using simulation techniques, it is possible to generate the phonemes in the form of electric signals supplied to a loud-speaker. The selection of tube portion lengths correlates to the accuracy of the approximation desired. For a three-formant approximation (formants are the tube resonance frequencies), the tube is divided into eight portions having successive lengths, L/10, L/15, 2L/15, 3L/15, 3L/15, 2L/15, L/15 and L/10, where L is the overall length of the tube.

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H. K. Dunn, The Calculation of Vowel Resonances, and an Electrical Vocal Tract, The Journal of the Acoustical Society of America, vol. 22, No. 6, Nov. 1950, pp. 740-753.

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