语音同一性鉴定中口音韵母、鼻化韵母、鼻韵母的语图判别法探究

Discrimination of Oral Final, Nasalized Final and Nasal Final between the Syllables of Dialect and Corresponding Mandarin by Sonogram

目的解决语音同一性鉴定中如何依据语图准确区分方言与对应普通话音节是口音韵母、鼻化韵母还是鼻韵母。方法利用语音工作站对口音韵母、鼻化韵母、鼻韵母的语图差异分别进行研究。结果得出了通过对夹鼻录音进行LPC谱分析来区分口音韵母与鼻音韵母;通过宽带语图的分析来区分鼻化韵母与鼻韵母等认识。结论为在方言与普通话之间进行语音同一性鉴定时选择可比对特征音节以及方言田野调查提供了参考依据。

Objective To study the method for discriminating oral final, nasalized final, nasal final between the syllables of dialect and corresponding Mandarin in forensic speech identification. Method The differences of oral finals, nasalized finals, nasal finals in sonograms were studied respectively using the VS-99 Voice Workstation. Result Oral finals and nasalized finals could be distinguished using LPC spectra. Nasalized final and nasal final could be differentiated using broadband sonograms. Conclusion The study results offer the basis for discriminating oral final, nasalized final, nasal final between the syllables of dialect and corresponding Mandarin in forensic speech identification and field study.