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<br />Barrier Attenuation <br />At Ground level Property Line <br />Height <br />Barrier Source Receiver Tranmission loss <br /> 17 <br />Distances <br /> barrier to <br />source to barrier receiver <br />N <br />0.12 0.24 0.49 0.98 1.95 3.91 7.81 15.63 <br />Frequencies <br />63 125 250 500 1000 2000 4000 8000 <br />17.95 9.05 4.52 2.26 1.13 0.57 0.28 0.14 <br />ARG <br />0.88 1.24 1.75 2.48 3.50 4.95 7.01 9.91 <br />Attenuation <br />1.91 3.32 5.39 8.00 10.90 13.90 16.91 19.92 <br />5 5 5 5 5 5 5 5 <br />6.91 8.32 10.39 13.00 15.90 18.90 21.91 24.92 <br />ref spectrum <br />65 65 65 65 65 65 65 65 <br />1619.665831 11693.072 36377.5 79406.94 81191.03 51282.1 25646.07 8090.814 <br />7943.282347 79432.823 398107 1584893 3162278 3981072 3981072 2511886 <br /> 54.70274 <br /> <br />HEIGHTS (in ft.) <br />Source : 8 <br />Barrier: 12 <br />Receiver: 5 <br /> <br />Distances (in ft.) <br />Source to Barrier: 10 <br />Barrier to Receiver: 61.5 <br /> <br />Spectrum <br />Attenuation <br />Final SPl <br /> <br />63 <br />65 <br />6.9 <br />58.1 <br /> <br />Octave Band Center Frequencies (Hertz) <br />125 I 250 I 500 I 1000 I 2000 I 4000 <br />65 65 65 65 65 65 <br />8.3 10.4 13.0 15.9 18.9 21.9 <br />56.7 54.6 52.0 49.1 46.1 43.1 <br /> <br />Transmission Loss: 17 <br /> <br />Note: These results were based on leo Beranek's method for barrier <br />calculations(1). The method incorporates Makawa's published data and <br /> <br />1. Leo L. Beranek, "Acoustics", Acoustical Society of America, P.348 (1996) <br /> <br />31~~ 11 <br /> <br />8000 <br />65 <br />24.9 <br />40.1 <br />