Statistical examination of invariance of relative F_0 change field for Chinese disyllabic words

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In automatic voice response systems where a large number of words are inserted into fixed sentences, such as in voice-guided car navigation systems, one of the most important problems is the adjustment of the fundamental frequency (F_0) contour of the inserted word to suit the F_0 context of the fixed sentence. In Mandarin Chinese, it is required that the effects of tone and intonation on F_0 contours be represented separately. We proposed a scheme to solve the problem in terms of a word-level F_0 range (WF_0R) and a set of relative F_0 change fields. WF_0R in any position of a sentence is a tone-independent general F_0 range to represent the intonational effect; whereas F_0 change field (F_0CF) is an F_0 range that accounts for the result of both the tone combination of words and the intonation. Relative F_0CF is regulated in reference to WF_0R and represents tonal effect on F_0. In this paper, we statistically examine the invariance of the relative F_0CF with various speakers' speech data. From an analysis of four native speakers' utterances of 160 disyllabic words in the initial, middle and final parts of three carrier sentences, which were recorded on 2 or 3 days, it is found that: (1) Chinese speakers read words in the same sentence position with stable relative F_0CFs, even on different days; and (2) the relative F_0CFs in the middle position of a sentence are generally the same as those in the initial position but slightly different from those in the final position.
社団法人日本音響学会の論文

Statistical examination of invariance of relative F_0 change field for Chinese disyllabic words

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