Abstract
The use of single-number ratings is quite common in describing the acoustic performance of various building elements, e.g., the sound-transmission class of a wall or the impact-noise rating of a floor. The determination of single-number ratings involves certain assumptions regarding the relative importance of various frequency bands. In the sound transmission class (STC) rating system, for instance, a TL curve of irregular shape must be compared to a standard reference curve. The contribution of various frequency bands depends on the shape of the reference curve and on the method of comparison. An experiment has been carried out to determine subjectively the effect of various irregularities in TL curves as compared to a standard curve such as the STC contour. Results so far show that for frequencies in the range 500, 1000, and 2000 Hz, a dip 1 oct wide would effectively reduce the STC rating by 5 as compared to a dip 13 oct wide of the same depth.
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