4 results about "Noise reduction coefficient" patented technology

The Noise Reduction Coefficient (commonly abbreviated NRC) is a logarithmic representation of the decay rate (dB/s) due to a panel or object with a defined surface area absorbing energy compared to the decay rate in a standard reverberant room without the panel or object. An NRC of 0 indicates the object does not contribute to attenuating sound for frequencies at 250 Hz, 500 Hz, 1000 Hz, and 2000 Hz range; an NRC of 1 indicates an average attenuation of sound per unit area that's equal to the average attenuation and transmittance of sound found in a reverberant room that meets the ASTM C423 standard for construction, size, shape, sound diffusion, and background noise, and decay rate for frequencies between 100 Hz and 5000 Hz. The NRC is highly dependant on the type of mounting,, which, if not specified, is usually a Type A mounting (ABPMA mounting #4) where the material is placed directly on the floor, wall, or ceiling.