Archives of Acoustics, 46, 2, pp. 229–235, 2021

Relationship Between Chinese Speech Intelligibility of Elderly and Speech Transmission Index

Jianxin PENG
South China University of Technology

Jiazhong ZENG
South China University of Technology

Yuezhe ZHAO
South China University of Technology

In this paper, the relationship between Chinese speech intelligibility (CSI) scores of the elderly aged 60–69 and over 70 years old, and speech transmission index (STI) were investigated through the auralization method under different reverberation time and background noise levels (BNL, 40 dBA and 55 dBA). The results show that the CSI scores of the elderly are significantly worse than those of young adults. For the elderly over 70, the CSI scores become much lower than those of young adults. To be able to achieve the same CSI, the elderly, especially those over 70, need much higher STI and greater SNR than the young. The elderly aged 60–69 and over 70 need to improve their STI by 0.419 and 0.058 respectively under BNL 40 dBA, as well as 0.282 and 0.072 respectively under BNL 55 dBA, so as to obtain the same CSI scores as the young adults.
Keywords: speech intelligibility; speech transmission index; signal-to-noise ratio; background noise level; speech sound pressure level; reverberation time
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DOI: 10.24425/aoa.2021.136578