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The disagreement between speech transmission index (STI) and speech intelligibility

机译：语音传输指数（STI）与语音清晰度之间的分歧

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References(11) Cited-By(1) In previous work, the authors examined the tendency of changes in the Speech Transmission Index (STI) using several modeled sound fields. The results showed that energy concentration due to strong reflections at any delay time, short or long, increases the STI. This means that the STI evaluates only the degree of energy concentration or dispersion in the time domain regardless of the delay time. As such, the STI fundamentally contradicts the generally accepted concept that early reflection is important in speech intelligibility. However, it has not yet been clarified as to whether such a property of the STI corresponds to intelligibility or merely reveals a defect in the STI. To examine the validity of the STI, speech intelligibility tests were conducted using sound fields with different energy concentration points. The results show that energy concentration at shorter delay times increases intelligibility, thus reconfirming the concept of importance of early energy, and indicates clear disagreement with the STI. The STI cannot be considered to correspond to intelligibility because it does not distinguish useful early energy from non-early energy, which does not contribute to intelligibility.
机译：参考文献（11）Cited-By（1）在以前的工作中，作者使用几种模拟声场检验了语音传输指数（STI）的变化趋势。结果表明，在任何延迟时间（短时或长时）中，由于强反射引起的能量集中都会增加STI。这意味着STI仅评估时域中的能量集中或分散程度，而与延迟时间无关。因此，STI从根本上与人们普遍接受的观念相矛盾，即早期反射在语音清晰度方面很重要。然而，关于STI的这种性质是对应于可理解性还是仅仅揭示了STI中的缺陷，尚不清楚。为了检查STI的有效性，使用具有不同能量集中点的声场进行了语音清晰度测试。结果表明，在较短的延迟时间内集中能量会提高清晰度，从而重新确认了早期能量的重要性概念，并表明与STI明显不同。 STI不能被认为与可懂度相对应，因为它不能区分有用的早期能量和非早期能量，后者不能促进可懂度。

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