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1-3rd Octave Band biography, 1-3rd Octave Band discography
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Transmission Loss (TL) is a figure which rates the ability of a material to block sound.Mathematically it is defined as the ratio of
the sound energy transmitted through a material to the sound energy incident on the material.Broadband noise is played in one room (source).The difference
between the sound levels in the source room the the other (receiving) room is defined as the Noise Reduction (NR).The density of the material is directly related to Transmission Loss.Unlike the STC contour, the Rw contour is defined over a slightly lower frequency range of
100 Hz to 3.The actual Rw value is equal to the fitted contour value at 500 Hz.The STC rating resulting from the contour fitting procedure is the TL value of the contour at 500Hz.NRC
The Noise Reduction Coefficient, defines how much sound specific materials absorb.Hz rounded to the nearest 0.Just as various colors of paint, or textures, visually
alter a room, various materials with different NRC ratings, such as carpet or tile, audibly
alter a room.NRC rating (tile) absorbs little sound and a material with
a higher NRC rating (carpet) absorbs more sound.B(A)
The human ear does not hear all frequencies with the same intensity.Above and below this range the ear becomes progressively less sensitive.
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