Department of Architecture University of Florida ARC 4620 Environmental Technology 2 Glenn SweitzerFall 2003 Bumjun Kim, Youngmin Kwon, Todd Gabbard Assignment 3: NOISE REDUCTION Due in Lab, Tuesday, September 23, 2003. Transmission Loss (abbreviated TL and measured in decibels) of a barrier is the ratio of sound level in a receiving room to the sound level in the source room. It is a measure of how much sound energy is reduced through materials. It shows the sound isolating quality of the barrier. Generally more massive materials tend to have higher TL. Noise Reduction (NR) is defined as the difference between the intensity levels (dB) in the two rooms and is related to the TL of the barrier. NR and TL are not equal but are related by the size of the dividing wall and the absorption characteristic of the receiving room. In summary, the NR is dependent on the three basic factors: area of wall transmitting sound, absorption in receiving room, and transmission loss of dividing wall.
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