音强斜率特性区别同卵双胞胎语音的实验研究

A study on comparing identical twins’ speech using slopes of intensity

为了寻找司法话者识别中区别同卵双胞胎语音的有效参量,该文利用音节音强的斜率特性对同卵双胞胎语音进行了实验研究.结果发现,在90% 的置信度下,所有实验的双胞胎语音均能够被音节音强斜率予以区别,并且音强下降斜率的区别力明显高于音强上升斜率的区别力.因此得出结论,音节音强的斜率特性具有比音节间相对音强与相对时长二者联合检验更强的区别力,可以作为区别同卵双胞胎语音的有效参量.

Objective In order to find effective parameters to distinguish identical twins from speech in Forensic Speaker Comparison. Method The identical twins’ speech, which can’t be distinguished using the relative intensity and relative duration across syllables, have been analyzed qualitatively by the positive and negative slopes of syllable intensity. Result All the twins’ speech can be distinguished using the slopes of intensity in the confidence level of 90%. And the distinguishing power of negative slope is higher than that of positive slope. Conclusion The slopes of intensity have more distinguishing value than that of the union of the relative intensity and relative duration across syllables, and can be used to identify identical twins’ speech.