本文通过对单音节字的声学测量及分析,对比上海市的地方普通话和普通话的元音系统,从而为汉语口语处理基本元音系统提供可靠的声学参数。发现:1.受上海话自身元音系统的影响,上海普通话男女声学元音图都表现出一定的外延性。2.上海普通话无论男女,在声学元音图上的分布都有很大的重叠区。3.从共振峰模式图上看:上海普通话[y ,i]的F1 - F2 距离都较标准普通话的大,其中的共振峰模式几乎接近于。41 多数发音人的[?]都或多或少表现出双元音化趋势。

Dialectal differences are widely investigated for dialect identification , language (L2) learning and pronunciation modeling for Automatic Speech Recognition (ASR) . Especially in Chinese ASR systems , how to deal with the accent issue becomes a big challenge due to the variability of the language. We compared these pure monophthongs [?a ,u ,? ?,y ,i] for 10 SM (Standard Mandarin) and 20 ASH (Shanghai-accented Mandarin) speakers in NOKIA-CASS corpus and tried to find out the differences in monophthongs between SC and ASH: (1) under the influence of its dialectal vowel inventory , the vocalic space of ASH would be inevitably more peripheral. (2) there is a large overlap between the two vowel ellipses of in ASH speakers while in SC there is not. (3) in comparison with SC , the first two formants of [ y ,i ] are all drawn much further in ASH speakers. Meanwhile the formant pattern of is very similar to that of in ASH speakers. (4) vowel [??] in most speakers has a tendency of diphthongization , especially in ASH speakers.