语言传输指数直接与间接测量方法实验对比

Experimental Comparison Between Direct and Indirect Measurement Methods for Speech Transmission Index

摘要:

通过对4个不同房间内12个测点共48个听音条件的测量，分析了直接测量方法和间接测量方法测量语言传输指数（STI）、公共广播系统语言传输指数（STIPA）时的差异以及不同频率响应的测量系统对这两种测量方法的影响.结果表明，只要采用标准化的测量系统、测试程序，测量过程严格按照规定执行，这两种方法测得的STI和STIPA都能准确反映出语言经过声传输通路后与语言可懂度相关特征的变化，测量结果都可以用于语言可懂度的客观评价，差别较小.

Abstract:

The speech transmission index (STI) and speech transmission index for public address system (STIPA) metrics at 12 receivers in 4 rooms, with a total of 48 acoustic conditions, were measured using the direct and indirect method and the measurement results of the two methods were compared, with a particular attention on the influence from the frequency response of the measurement system. The results show that, there is no substantial difference between STI and STIPA metrics; both direct and indirect measurement can be used as an objective rating method for speech intelligibility, as long as the standardised measurement program and measurement system are adopted.