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Natural Science Forum / Physics / Acoustics / November 2005STC and Rw ratings.
Can anyone help me get a copy of the algorithm/procedure for calculating STC and RW ratings. I have been doing STC and RW measurements extensively for some time, but since moving I no longer have access to a written version of the procedure. I wish to code some software to calculate the ratings. Any assistance will be much appreciated. Tim The STC and RW contours are three straight line segments with break points at 400 and 1250 Hz. Flat from 1250 up. They decrease 1 dB per third octave down to 400 Hz (5 dB lower than 1250 Hz) and then 3 dB per third octave below that. The STC contour goes from 125 to 4000 Hz. The Rw contour goes from 100 to 3150 Hz. Each allows a total of 32 "deficiencies" below the contour, but the STC imposes the additional constraint that no point can be more than 8 dB below the contour. > Can anyone help me get a copy of the algorithm/procedure for > calculating STC and RW ratings. I have been doing STC and RW [quoted text clipped - 5 lines] > > Tim > Can anyone help me get a copy of the algorithm/procedure for > calculating STC and RW ratings. I have been doing STC and RW [quoted text clipped - 5 lines] > > Tim If you use Excel, you can download macros from www.alfwarnock.info/profess. There are routines in snr.xla that let you calculate STC, Rw etc. Once you load in snr.xla, you can look at the VBA code if you want. Alf |
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