Abstract
AbstractTo recognize the continuous speech by phonemes, the coarticulation must be analyzed. This paper presents a result of psy‐choacoustic experiment for symmetrical three‐vowel sequences, which are generated by the terminal‐analog‐type speech synthesizer, indicating the auditory compensation effects in coarticulation on the phoneme perception. Using each of five Japanese vowels as a reference vowel V0, the symmetrical three‐vowel sequences, /V0‐VV0/ are formed. The distribution of the perceptual phoneme for the middle vowel is examined first. By comparing the results with the perceptual phoneme distribution for five stationary vowels, the shift of the perceptual phoneme distribution due to the auditory compensation effect is investigated. A model is proposed for the boundary shift in the perceptual phoneme distribution. In the model, the 50‐percent phoneme boundary of the perceptual phoneme distribution for five stationary vowels is approximated by straight lines on the F1 ‐ F2 logarithmic plane. The straight lines are contracted in the direction of (F1, F2) point of the reference vowel along the F1 and F2 axis. The proposed model is applied to the perceptual phoneme distributions of the middle vowels in the symmetrical three‐vowel sequences, and its usefulness is demonstrated.
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