Volume 118, Issue 2, August 2005
Index of content:
- SPEECH PRODUCTION 
118(2005); http://dx.doi.org/10.1121/1.1942349View Description Hide Description
The present study attempted to investigate the acoustic characteristics of Mandarin laryngeal and esophageal speech. Eight normal laryngeal and seven esophageal speakers participated in the acoustic experiments. Results from acoustic analyses of syllables ∕ma∕and ∕ba∕ indicated that, , intensity, and signal-to-noise ratio of laryngealspeech were significantly higher than those of esophageal speech. However, opposite results were found for vowel duration, jitter, and shimmer. Mean , intensity, and word per minute in reading were greater but number of pauses was smaller in laryngealspeech than those in esophageal speech. Similar patterns of contours and vowel duration as a function of tone were found between laryngeal and esophageal speakers. Long-time spectra analysis indicated that higher first and second formant frequencies were associated with esophageal speech than that with normal laryngealspeech.
118(2005); http://dx.doi.org/10.1121/1.1953270View Description Hide Description
The study was conducted to provide an acoustic description of coronal stops in Canadian English (CE) and Canadian French (CF). CE and CF stops differ in VOT and place of articulation. CE has a two-way voicing distinction (in syllable initial position) between simultaneous and aspirated release; coronal stops are articulated at alveolar place. CF, on the other hand, has a two-way voicing distinction between prevoiced and simultaneous release; coronal stops are articulated at dental place. Acoustic analyses of stop consonants produced by monolingual speakers of CE and of CF, for both VOT and alveolar/dental place of articulation, are reported. Results from the analysis of VOT replicate and confirm differences in phonetic implementation of VOT across the two languages. Analysis of coronal stops with respect to place differences indicates systematic differences across the two languages in relative burst intensity and measures of burst spectral shape, specifically mean frequency, standard deviation, and kurtosis. The majority of CE and CF talkers reliably and consistently produced tokens differing in the SD of burst frequency, a measure of the diffuseness of the burst. Results from the study are interpreted in the context of acoustic and articulatory data on coronal stops from several other languages.
118(2005); http://dx.doi.org/10.1121/1.1923349View Description Hide Description
We explored a database covering seven dialects of British and Irish English and three different styles of speech to find acoustic correlates of prominence. We built classifiers, trained the classifiers on human prominence/nonprominence judgments, and then evaluated how well they behaved. The classifiers operate on 452 ms windows centered on syllables, using different acoustic measures. By comparing the performance of classifiers based on different measures, we can learn how prominence is expressed in speech. Contrary to textbooks and common assumption, fundamental frequency played a minor role in distinguishing prominent syllables from the rest of the utterance. Instead, speakers primarily marked prominence with patterns of loudness and duration. Two other acoustic measures that we examined also played a minor role, comparable to . All dialects and speaking styles studied here share a common definition of prominence. The result is robust to differences in labeling practice and the dialect of the labeler.