TY - JOUR A1 - Williams, Daniel Philip A1 - Escudero, Paola A1 - Gafos, Adamantios I. T1 - Spectral change and duration as cues in Australian English listeners' front vowel categorization JF - The journal of the Acoustical Society of America N2 - Australian English /iː/, /ɪ/, and /ɪə/ exhibit almost identical average first (F1) and second (F2) formant frequencies and differ in duration and vowel inherent spectral change (VISC). The cues of duration, F1 × F2 trajectory direction (TD) and trajectory length (TL) were assessed in listeners' categorization of /iː/ and /ɪə/ compared to /ɪ/. Duration was important for distinguishing both /iː/ and /ɪə/ from /ɪ/. TD and TL were important for categorizing /iː/ versus /ɪ/, whereas only TL was important for /ɪə/ versus /ɪ/. Finally, listeners' use of duration and VISC was not mutually affected for either vowel compared to /ɪ/. Y1 - 2018 U6 - https://doi.org/10.1121/1.5055019 SN - 0001-4966 SN - 1520-8524 VL - 144 IS - 3 SP - EL215 EP - EL221 PB - American Institute of Physics CY - Melville ER - TY - JOUR A1 - Williams, Daniel A1 - Escudero, Paola T1 - A cross-dialectal acoustic comparison of vowels in Northern and Southern British English JF - The journal of the Acoustical Society of America N2 - This study compares the duration and first two formants (F1 and F2) of 11 nominal monophthongs and five nominal diphthongs in Standard Southern British English (SSBE) and a Northern English dialect. F1 and F2 trajectories were fitted with parametric curves using the discrete cosine transform (DCT) and the zeroth DCT coefficient represented formant trajectory means and the first DCT coefficient represented the magnitude and direction of formant trajectory change to characterize vowel inherent spectral change (VISC). Cross-dialectal comparisons involving these measures revealed significant differences for the phonologically back monophthongs /D, , , u:/ and also /3z:/ and the diphthongs /eI, e, aI, I/. Most cross-dialectal differences are in zeroth DCT coefficients, suggesting formant trajectory means tend to characterize such differences, while first DCT coefficient differences were more numerous for diphthongs. With respect to VISC, the most striking differences are that /u:/is considerably more diphthongized in the Northern dialect and that the F2 trajectory of /e/proceeds in opposite directions in the two dialects. Cross-dialectal differences were found to be largely unaffected by the consonantal context in which the vowels were produced. The implications of the results are discussed in relation to VISC, consonantal context effects and speech perception. (c) 2014 Acoustical Society of America. Y1 - 2014 U6 - https://doi.org/10.1121/1.4896471 SN - 0001-4966 SN - 1520-8524 VL - 136 IS - 5 SP - 2751 EP - 2761 PB - American Institute of Physics CY - Melville ER - TY - JOUR A1 - Williams, Daniel A1 - Escudero, Paola T1 - Influences of listeners' native and other dialects on cross-language vowel perception JF - Frontiers in psychology KW - non-native speech perception KW - native dialects KW - non-native dialects KW - speech production KW - acoustic phonetics Y1 - 2014 U6 - https://doi.org/10.3389/fpsyg.2014.01065 SN - 1664-1078 VL - 5 PB - Frontiers Research Foundation CY - Lausanne ER - TY - JOUR A1 - Kashima, Eri A1 - Williams, Daniel A1 - Ellison, T. Mark A1 - Schokkin, Dineke A1 - Escudero, Paola T1 - Uncovering the acoustic vowel space of a previously undescribed language: The vowels of Nambo JF - The journal of the Acoustical Society of America N2 - This study presents the first acoustic description of the vowel space of a Papuan language—Nambo, spoken in southern Papua New Guinea—based on duration and first and second formant measurements from 19 adult male and female speakers across three age groups (young, middle-aged, senior). Phonemically, Nambo has six full vowels /i, e, æ, ɑ, o, u/ and a reduced vowel tentatively labeled /ə/. Unlike the full vowels, the quality of /ə/ showed great variation: seniors' and young females' realizations tended to be more open and retracted than those by young males, while middle-aged speakers' productions fell between these two variants. Y1 - 2016 U6 - https://doi.org/10.1121/1.4954395 SN - 0001-4966 SN - 1520-8524 VL - 139 SP - EL252 EP - EL256 PB - American Institute of Physics CY - Melville ER - TY - JOUR A1 - Elvin, Jaydene A1 - Williams, Daniel A1 - Escudero, Paola T1 - Dynamic acoustic properties of monophthongs and diphthongs in Western Sydney Australian English JF - The journal of the Acoustical Society of America N2 - This study provides a thorough acoustic analysis of the 18 Australian English monophthongs and diphthongs produced in a variety of phonetic contexts by young adult speakers from Western Sydney. The 18 vowels are well separated by duration and dynamic formant trajectory information. Vowel durations and formant trajectories were affected by the consonantal context in which the vowels were produced, particularly those produced in the /hVd/ context. Finally, the results indicate that capturing aspects of vowel inherent spectral change may be useful in future cross-dialectal and cross-linguistic studies. (C) 2016 Acoustical Society of America. Y1 - 2016 U6 - https://doi.org/10.1121/1.4952387 SN - 0001-4966 SN - 1520-8524 VL - 140 SP - 576 EP - 581 PB - American Institute of Physics CY - Melville ER -