An Improved STI Method for Evaluating Mandarin Speech Intelligibility
Speech Transmission Index (STI) is a physical metric predicting the speech intelligibility. It shows a good correlation with the subjective intelligibility when used for English, but it has not been reported to be applicable to such tonal language as Mandarin. In this study, the traditional STI method is improved by adopting an accumulative normal distribution assumption between the signal-to-noise ratios and intelligibility, in which some characteristics of Mandarin speech are taken into considered. Results from psychoacoustic perceptual experiments show that the improved method is more suitable for objective evaluation of Mandarin speech intelligibility in noisy and reverberant listening conditions compared with the traditional method. The correlation coefficient between the subjective intelligibility and the objective STI is improved from 0.97 to 0.98; and the standard error decreased from 15.67% to 6.58%. This method is also expected to be applicable to other languages.
Lin Yang Jianping Zhang Yonghong Yan
ThinkIT Speech Lab, Institute of Acoustics, Chinese Academy of Sciences
国际会议
2008 International Conference on Audio，Language and Image Processing(2008国际声音、语言、图像过程大会)
镇江
英文
102-106
2008-07-07（万方平台首次上网日期，不代表论文的发表时间）