Killion Mead C
Etymotic Research, Inc., 61 Martin Lane, Elk Grove Village, IL 60007, USA.
J Acoust Soc Am. 2009 Sep;126(3):EL97-9. doi: 10.1121/1.3204155.
A difference of approximately 5 dB exists between the level of spoken English determined using the ANSI standard vu-meter method compared to the common root-mean-square (rms) method. If the rms method is substituted for the present ANSI standard method for calibrating a speech audiometer, for example, the reported speech reception thresholds will improve 5 dB: Speech levels read approximately 5 dB less using rms. Similarly, the reported signal-to-noise ratio required to understand speech in a speech-spectrum noise will be 5 dB better using rms. A simple method for obtaining a close approximation to traditional calibrations using a modified rms method is given.
与常用的均方根（rms）方法相比，使用美国国家标准学会（ANSI）标准音量计方法测定的英语口语水平之间存在约5分贝的差异。例如，如果用rms方法替代当前用于校准言语听力计的ANSI标准方法，报告的言语接受阈值将提高5分贝：使用rms时读取的言语水平约低5分贝。同样，使用rms时，在言语频谱噪声中理解言语所需的报告信噪比将提高5分贝。本文给出了一种使用改进的rms方法获得与传统校准近似结果的简单方法。
