Definitions for "NOISE REDUCTION COEFFICIENT"
A measure for rating the overall sound absorption performance of a material when used in an enclosed architectural space such as an office, where sound is being reflected at many angles of incidence. Specifically, it is the 4 frequency averaged absorption coefficients @ 250, 500, 1000 and 2000 Hz, rounded to the nearest 0.05. A material with NRC 0.50 is a poor absorber, and NRC .80 is a very good absorber.
A measurement of a material's ability to absorb noise.
The rating that identifies the ability of an object to absorb rather than reflect sound.