Recognition of three- vowel sequences on the basis of perceptual phoneme boundary lines defined by a flexible model
✍ Scribed by Teruhiko Ohtomo; Masato Kaneko; Takao Ohuchi; Ken-Ichi Hara
- Publisher
- John Wiley and Sons
- Year
- 1992
- Tongue
- English
- Weight
- 792 KB
- Volume
- 23
- Category
- Article
- ISSN
- 0882-1666
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✦ Synopsis
Abstract
The authors are attempting to clarify the emphasizing mechanism of phoneme perception in co‐articulation. Psychoacoustic experiments were made on the symmetrical and asymmetrical three‐vowel sequences, and the effect of the preceding or succeeding vowels on the central vowel is examined.
Based on the examined effect, a model is proposed wherein the perceptual phoneme boundary lines of the central vowel are set, considering the three‐vowel sequence as a unit. Using this model, the perceptual phoneme boundary line of the central vowel of the three‐vowel sequence can be defined by adjusting the 50 percent phoneme boundary line in the perceptual phoneme distribution of the steady vowel on F~1~‐F~2~ logarithmic plane, according to the positions of the formant frequencies of the preceding and succeeding vowels.
A model is presented here which defines the phoneme boundary lines of the central vowel in the three‐vowel sequence with co‐articulation, by adjusting the 50 percent perceptual phoneme boundary lines of the steady vowel. It is then applied to the real spoken vowels, and its effectiveness is evaluated. Then an automatic recognition system for the three‐vowel sequence is proposed, which is based on the trajectory of the three‐vowel formant frequency and the perceptual phoneme boundary lines set by the flexible model. A recognition experiment is conducted for the three‐vowel sequences using the system, and the usefulness of the system is demonstrated.