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)
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).
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