Calcolatore Riduzione del Rumore — Formula

Noise Reduction Between Rooms

The noise reduction (NR) is the actual level difference between two rooms separated by a partition.

Formula

NR = TL + 10 log10(A / S)

  • *TL* = sound transmission loss of the wall (dB)
  • *A* = total absorption in the receiving room (Sabine)
  • *S* = area of the partition

    • If the receiving room is very absorbent (A > S), NR exceeds TL. If it is reverberant (A < S), NR is less than TL.

    Esempio Risolto

    Wall TL = 45 dB, wall area = 15 m2, receiving room absorption = 30 m2 Sabine.

    1. NR = TL + 10 log10(A/S)
    2. NR = 45 + 10 log10(30/15)
    3. NR = 45 + 10 log10(2)
    4. NR = 45 + 3.01 = 48.01 dB