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Research on physical measure and subjective evaluation method corresponding to speech transmission performance of rooms.

房间语音传输性能对应的物理测量和主观评价方法研究

基本信息

批准号：
11650618
负责人：
ONAGA Hiroshi
金额：
$ 2.18万
依托单位：
Kinki University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2001
项目状态：
已结题

项目摘要

The defect of STI was clarified by both theoretical examination and subjective experiment. The model calculation of STI on the change tendency showed that STI was determined by the degree of concentration of the energy on time axis, that contradict the widely accepted concept of importance of early energy for speech intelligibility. The word intelligibility test was carried out in the synthesized sound field with different energy concentration point, and it was shown that there is a case in which STI contradicts the intelligibility. The intelligibility test carried out for the single reflection sound field under background noise condition showed that the intelligibility score for positive and negative relative levels of single reflection took different values despite of the same STI values.The subjective evaluation experiment was carried out using impulse response of the actual sound field, and the correspondence with various physical measures was examined. It was shown that the correlation between the subjective evaluation and each physical measure showed smaller value for large volume space. The evaluation of the speech transmission performance of the large volume space is future problem.The effect of the speech rate on the intelligibility was examined. The intelligibility lowered with the increase of the speech rate in the reverberant fields, though the intelligibility is unrelated to the speech rate in background noise field. The lowering of the intelligibility by reverberation appeared clearly for elderly people than for young people.The result of the examination on the intelligibility test method showed that it was effective to raise the sensitivity of the intelligibility test to add the carrier phrase and to use the fast speech rate in the reverberant field. It was shown that the use of low familiarity words might raise the sensitivity on the intelligibility test for both reverberant field and background noise field.

通过理论检验和主观实验，澄清了STI的缺陷。 STI变化趋势的模型计算表明，STI是由能量在时间轴上的集中程度决定的，这与广泛接受的早期能量对语音清晰度的重要性的概念相矛盾。在不同能量集中点的合成声场中进行词语清晰度测试，结果表明存在STI与清晰度相矛盾的情况。对背景噪声条件下单次反射声场进行的清晰度测试表明，尽管STI值相同，但单次反射的正负相对电平的清晰度得分却不同。利用实际声场的脉冲响应进行主观评价实验，考察与各种物理量度的对应关系。结果表明，对于大体积空间，主观评价与各项物理测量之间的相关性值较小。大容量空间的语音传输性能评估是未来的课题。考察了语速对清晰度的影响。混响场中的可懂度随着语速的增加而降低，而背景噪声场中的可懂度与语速无关。混响对清晰度的降低在老年人中表现得比年轻人明显。清晰度测试方法的检验结果表明，在混响场中添加载波短语和使用较快的语速可以有效提高清晰度测试的灵敏度。结果表明，使用低熟悉度单词可能会提高混响场和背景噪声场的清晰度测试的灵敏度。