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Comparison of vu-meter-based and rms-based calibration of speech levels

Comparison of vu-meter-based and rms-based calibration of speech levels,10.1121/1.3204155,Journal of The Acoustical Society of America,Mead C. Killion

Comparison of vu-meter-based and rms-based calibration of speech levels  
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A difference of approximately 5 dB exists between the level of spoken English determined using the ANSI standard vu-meter method com- pared 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 im- prove 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.
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