N
6 Posts in this encyclopedia categoryNoise barrier
A noise barrier is a wall that prevents the propagation of noise, or shields an area from noise. Noise barriers are often erected along railway or motorway sections.
NRC (Noise Reduction Coefficient)
The NRC of an acoustical material is its average absorption coefficients in the frequency range from 250 to 2,000 Hz. Hence the NCR reflects the sound-absorbing characteristics of a given material.