免费降噪计算器
计算隔墙或隔声装置的噪声衰减量。
Noise Reduction
48.01 dB
Noise Reduction vs Transmission Loss (TL)
公式
## 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.
计算示例
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
常见问题
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).
学习