The use of the NR values is a method for rating the quality of indoor environemnts for the purposes of speech communication, hearing preservation and annoyance. Add a noise pressure level in the following form for rate it.
Ranting the noise spectrum
The NR curve that applies is the highest numerical value that is not exceeded in the band. The overall NR is the highest of all the NR values obtained.
NR Upper Limit
NR Upper Number
Applications of the NR curve obtained
The acceptable applications of the NR curve number obtained are showed in green in the next table.
Noise rating curve
Concert halls, broadcasting and recording studios, churches