语音传输指数用于语言声厅堂音质客观评价研究

语音传输指数（STI）是国际上广泛接受的言语可懂度客观评价参量。与传统语言声厅堂音质客观评价参量相比，STI能综合考虑混响时间、信噪比的影响，并与言语可懂度的主观感受直接对应，有着传统参量不具备的优势。但由于STI方法定义复杂，影响因素较多，应用与推广一直不太理想，当前除了在音频领域有一定的应用之外，在厅堂声学领域，国际、国内标准采用STI作为控制指标的并不多。随着IEC 60268-16最新修订版的推出，这种情况正在快速改变。但在广泛用于厅堂音质客观评价之前，STI与传统评价参量如混响时间RT、背景噪声、明晰度C50、侧向声能因子之间的关系到底如何，以及在厅堂音质客观评价时可承担怎样的角色，是否可以代替一些传统参量等，还需系统深入的研究。本课题的主要目的是要建立一套严谨科学的解决方法体系，为STI方法在厅堂声学领域的推广与应用提供理论与数据支持，也为国内相关标准的下一步修订提供参考。

The Speech Transmission Index (STI) is an international acceptance metric for the objective evaluation of speech intelligibility. As compared with the traditional objective rating parameters of sound quality for speech auditoria, the STI can predict the combined effects of both reverberation time and signal-to-noise ratio, and corresponding to the subjective perception of speech intelligibility directly, has the advantages that the traditional parameters do not have. However, due to the complexity of STI model, and abundent influnence factors during the measurement, the application and promotion of STI has been far from ideal, except some applications in the fields of sound reinforcement systems and public address systems, in the field of auditoria acoustics, few current domestic and international standards have adopted the STI as a control index. With the latest revision of IEC 60268-16, this situation is changing rapidly. However, prior to the wide application and promotion of the STI method, for the relationship between STI and the traditional parameters such as reverberation time RT, background noise, clarity C50, lateral acoustic energy and so on, and what role can be assumed in the objective evaluation, whether some traditional parameters can be replaced by STI,etc., system-in-depth study still required. The main purpose of this project is to establish a rigorous and scientific solution system, which can provide theoretical and data assistance for the application and promotion of STI in the field of auditoria acoustics, and also provide reference for the further revision of the relevant domestic standards.