Bradley J S, Sato H, Picard M
National Research Council, Ottawa K1A 0R6, Canada.
J Acoust Soc Am. 2003 Jun;113(6):3233-44. doi: 10.1121/1.1570439.
This paper presents the results of new studies based on speech intelligibility tests in simulated sound fields and analyses of impulse response measurements in rooms used for speech communication. The speech intelligibility test results confirm the importance of early reflections for achieving good conditions for speech in rooms. The addition of early reflections increased the effective signal-to-noise ratio and related speech intelligibility scores for both impaired and nonimpaired listeners. The new results also show that for common conditions where the direct sound is reduced, it is only possible to understand speech because of the presence of early reflections. Analyses of measured impulse responses in rooms intended for speech show that early reflections can increase the effective signal-to-noise ratio by up to 9 dB. A room acoustics computer model is used to demonstrate that the relative importance of early reflections can be influenced by the room acoustics design.
本文介绍了基于模拟声场中语音清晰度测试以及对用于语音通信的房间脉冲响应测量分析的新研究结果。语音清晰度测试结果证实了早期反射对于在房间内实现良好语音条件的重要性。添加早期反射提高了受损和未受损听众的有效信噪比及相关语音清晰度得分。新结果还表明，在直达声减弱的常见情况下，正是由于早期反射的存在才使得语音能够被理解。对用于语音的房间实测脉冲响应的分析表明，早期反射可使有效信噪比提高多达9分贝。使用房间声学计算机模型来证明早期反射的相对重要性会受到房间声学设计的影响。
