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. 1996 Dec 1;20(3):255-272.
doi: 10.1016/S0167-6393(96)00063-5.

Intelligibility of normal speech I: Global and fine-grained acoustic-phonetic talker characteristics

Ann R Bradlow  1 , Gina M Torretta, David B Pisoni
Affiliations

Intelligibility of normal speech I: Global and fine-grained acoustic-phonetic talker characteristics

Ann R Bradlow et al. Speech Commun. .

Abstract

This study used a multi-talker database containing intelligibility scores for 2000 sentences (20 talkers, 100 sentences), to identify talker-related correlates of speech intelligibility. We first investigated "global" talker characteristics (e.g., gender, F0 and speaking rate). Findings showed female talkers to be more intelligible as a group than male talkers. Additionally, we found a tendency for F0 range to correlate positively with higher speech intelligibility scores. However, F0 mean and speaking rate did not correlate with intelligibility. We then examined several fine-grained acoustic-phonetic talker-characteristics as correlates of overall intelligibility. We found that talkers with larger vowel spaces were generally more intelligible than talkers with reduced spaces. In investigating two cases of consistent listener errors (segment deletion and syllable affiliation), we found that these perceptual errors could be traced directly to detailed timing characteristics in the speech signal. Results suggest that a substantial portion of variability in normal speech intelligibility is traceable to specific acoustic-phonetic characteristics of the talker. Knowledge about these factors may be valuable for improving speech synthesis and recognition strategies, and for special populations (e.g., the hearing-impaired and second-language learners) who are particularly sensitive to intelligibility differences among talkers.

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Figures

Fig. 1
Fig. 1
Scatter plot of overall intelligibility as a function of FO range. Male talkers are represented by closed triangles; female talkers are represented by open triangles.
Fig. 2
Fig. 2
Vowel space characteristics for a high-intelligibility talker (Talker F7) and a low-intelligibility talker (Talker M2): (a) vowel space area, (b) vowel space dispersion, (c) range in F1 and F2.
Fig. 3
Fig. 3
Waveforms of the sentence portion, “walled town”, as produced by Talker M1, who had a relatively long duration of voicing during the stop closure, and Talker M9, who had a very short duration of voicing during the stop closure.
Fig. 4
Fig. 4
Waveforms of the sentence portion, “play seems”, as produced by Talker F6, who had a short /s/ duration relative to the durations of the /plej/ and /imz/ portions, and Talker F1, who had a long /s/ duration relative to the durations of the /plej/ and /imz/ portions.
See this image and copyright information in PMC

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