Calculadora de Redução de Ruído
Calcule a redução de ruído (NRC) e atenuação sonora de materiais acústicos. Projete ambientes com controle adequado de som.
Noise Reduction
48.01 dB
Noise Reduction vs Transmission Loss (TL)
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)
If the receiving room is very absorbent (A > S), NR exceeds TL. If it is reverberant (A < S), NR is less than TL.
Exemplo Resolvido
Wall TL = 45 dB, wall area = 15 m2, receiving room absorption = 30 m2 Sabine.
- 01NR = TL + 10 log10(A/S)
- 02NR = 45 + 10 log10(30/15)
- 03NR = 45 + 10 log10(2)
- 04NR = 45 + 3.01 = 48.01 dB
Perguntas Frequentes
What is transmission loss?
TL measures how well a partition blocks sound. It is the ratio of incident to transmitted power in dB. A concrete wall might have TL = 50 dB; a thin plasterboard wall about 25 dB.
Why does receiving room absorption matter?
Sound that enters the receiving room reverberates. More absorption means the energy dissipates quickly, lowering the steady-state level and increasing effective NR.
How do I improve noise reduction?
Increase the wall TL (thicker, denser, or double-leaf walls) and increase absorption in the receiving room (acoustic panels, carpet).
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