Park H K, Bradley J S, Gover B N
National Research Council, Montreal Rd., Ottawa, Canada, K1A 0R6.
J Acoust Soc Am. 2008 Mar;123(3):1458-71. doi: 10.1121/1.2831736.
This paper reports on an evaluation of ratings of the sound insulation of simulated walls in terms of the intelligibility of speech transmitted through the walls. Subjects listened to speech modified to simulate transmission through 20 different walls with a wide range of sound insulation ratings, with constant ambient noise. The subjects' mean speech intelligibility scores were compared with various physical measures to test the success of the measures as sound insulation ratings. The standard Sound Transmission Class (STC) and Weighted Sound Reduction Index ratings were only moderately successful predictors of intelligibility scores, and eliminating the 8 dB rule from STC led to very modest improvements. Various previously established speech intelligibility measures (e.g., Articulation Index or Speech Intelligibility Index) and measures derived from them, such as the Articulation Class, were all relatively strongly related to speech intelligibility scores. In general, measures that involved arithmetic averages or summations of decibel values over frequency bands important for speech were most strongly related to intelligibility scores. The two most accurate predictors of the intelligibility of transmitted speech were an arithmetic average transmission loss over the frequencies from 200 to 2.5 kHz and the addition of a new spectrum weighting term to R(w) that included frequencies from 400 to 2.5 kHz.
本文报告了一项关于模拟墙壁隔音评级的评估，该评估依据透过墙壁传输的语音清晰度展开。受试者聆听经过修改的语音，这些语音模拟了透过20面具有广泛隔音评级的不同墙壁的传输情况，同时保持环境噪声恒定。将受试者的平均语音清晰度得分与各种物理测量值进行比较，以检验这些测量值作为隔音评级的成效。标准传声等级（STC）和加权隔音指数评级只是语音清晰度得分的中等成功预测指标，并且从STC中剔除8分贝规则仅带来了非常适度的改善。各种先前确立的语音清晰度测量方法（例如，清晰度指数或语音可懂度指数）以及从中衍生出的测量方法，如清晰度等级，都与语音清晰度得分有相对较强的关联。总体而言，涉及对语音重要频段的分贝值进行算术平均或求和的测量方法与清晰度得分的关联最为紧密。传输语音清晰度的两个最准确预测指标是200至2.5千赫频率范围内的算术平均传输损耗，以及在R(w)中加入一个新的频谱加权项，该加权项涵盖400至2.5千赫的频率。
