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Modelling vocal-tract acoustics validated by flow experiments

Modelling vocal-tract acoustics validated by flow experiments
Modelling vocal-tract acoustics validated by flow experiments
Modelling the acoustic response of the vocal tract is a complex task, both from the point of view of acquiring details of its internal geometry and of accounting for the acoustic-flow interactions. A VOcal-tract ACoustics program (VOAC) has been developed [P. Davies, R. McGowan & C. Shadle, Vocal Fold Phys., ed. I. Titze, San Diego: Singular Pub., 93-142 (1993)], which uses a more realistic, aeroacoustic model of the vocal tract than classic electrical-analogue representations. It accommodates area and hydraulic radius profiles, smooth and abrupt area changes, incorporating end-corrections, side-branches, and net fluid flows, including turbulence losses incurred through jet formation. Originally, VOAC was tested by comparing vowel formant frequencies (i) uttered by subjects, (ii) predicted using classic electrical analogues, and (iii) predicted by VOAC. In this study, VOAC is further validated by comparing the predicted frequency response functions for a range of flow rates with measurements of the radiated sound from a series of mechanical models of unvoiced fricatives [C. Shadle, PhD thesis, MIT-RLE Tech. Rpt. 506 (1985)]. Results show VOAC is more accurate in predicting the complete spectrum at a range of flow rates. Finally, preliminary work is presented with VOAC used to simulate the sound generated at a sequence of stages during the release of a plosive.
1161
Jackson, P.J.B.
81dc3458-f913-44b4-9829-ecb626df5278
Shadle, C.H.
dc56253d-9926-466f-a27c-b9a8252a5304
Jackson, P.J.B.
81dc3458-f913-44b4-9829-ecb626df5278
Shadle, C.H.
dc56253d-9926-466f-a27c-b9a8252a5304

Jackson, P.J.B. and Shadle, C.H. (1999) Modelling vocal-tract acoustics validated by flow experiments. Forum Acusticum: 137th ASA and 2nd Conv. EAA. p. 1161 .

Record type: Conference or Workshop Item (Other)

Abstract

Modelling the acoustic response of the vocal tract is a complex task, both from the point of view of acquiring details of its internal geometry and of accounting for the acoustic-flow interactions. A VOcal-tract ACoustics program (VOAC) has been developed [P. Davies, R. McGowan & C. Shadle, Vocal Fold Phys., ed. I. Titze, San Diego: Singular Pub., 93-142 (1993)], which uses a more realistic, aeroacoustic model of the vocal tract than classic electrical-analogue representations. It accommodates area and hydraulic radius profiles, smooth and abrupt area changes, incorporating end-corrections, side-branches, and net fluid flows, including turbulence losses incurred through jet formation. Originally, VOAC was tested by comparing vowel formant frequencies (i) uttered by subjects, (ii) predicted using classic electrical analogues, and (iii) predicted by VOAC. In this study, VOAC is further validated by comparing the predicted frequency response functions for a range of flow rates with measurements of the radiated sound from a series of mechanical models of unvoiced fricatives [C. Shadle, PhD thesis, MIT-RLE Tech. Rpt. 506 (1985)]. Results show VOAC is more accurate in predicting the complete spectrum at a range of flow rates. Finally, preliminary work is presented with VOAC used to simulate the sound generated at a sequence of stages during the release of a plosive.

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More information

Published date: February 1999
Additional Information: abstract only Organisation: ASA-EAA Address: Berlin, FRG
Venue - Dates: Forum Acusticum: 137th ASA and 2nd Conv. EAA, 1999-02-01
Organisations: Electronics & Computer Science

Identifiers

Local EPrints ID: 250432
URI: http://eprints.soton.ac.uk/id/eprint/250432
PURE UUID: 4d1d5f91-1bb8-42f2-83bc-f29c301e2426

Catalogue record

Date deposited: 06 Jan 2000
Last modified: 29 Jan 2020 14:58

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Contributors

Author: P.J.B. Jackson
Author: C.H. Shadle

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