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.
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机译:这项研究比较了标准南部英式英语(SSBE)和北部英语方言中11个名义上的单音通和5个名义上的二音通的持续时间和前两个共振峰(F1和F2)。 F1和F2轨迹使用离散余弦变换(DCT)拟合参数曲线,第零DCT系数表示共振峰轨迹均值,第一个DCT系数表示共振峰轨迹变化的幅度和方向,以表征元音固有谱变化(VISC)。涉及这些措施的方言比较表明,在语音学上的单向音/ D 、、、 u:/以及/ 3z:/和双音/ eI,e,aI,I /都有显着差异。大部分方言差异都在零个DCT系数中,这表明共振峰轨迹均趋于表征这种差异,而对于双峰,第一个DCT系数差异更大。关于VISC,最显着的差异是在北部方言中/ u:/更加分散化,并且在两种方言中/ e /的F2轨迹沿相反的方向进行。发现跨方言差异在很大程度上不受元音产生的辅音环境的影响。讨论了结果的含义,涉及VISC,辅音上下文效应和语音感知。 (c)2014年美国声学学会。
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