室内声传播的扩散场理论不适用于住宅和办公室中典型的带家具的房间。已经发现了另一种简单的经验关系，该关系基于声源的声功率级Lw、房间体积V、频率f以及与声源的距离r，以相当高的精度预测此类房间中的声压级Lp:Lp=Lw–10 logr（ft）–5 logv（cu ft）–3 logf（Hz）+25（dB），如果接受这种新关系，我们目前在有人居住的建筑物中进行现场测量的标准测试程序存在严重影响。由于房间吸收A未明确出现在公式中，因此在传输损耗和冲击噪声测试中，通常使用10 log（A/Ao）进行归一化可能是不正确的。此外，由于正常布置的空间中不会出现均匀的混响声场，因此不清楚应为接收测量什么- 传输损耗、降噪和冲击噪声测试中的室内声压级。引文:ASHRAE Transactions，1985年，第91卷，pt。伊利诺伊州芝加哥1A

The Diffuse Field Theory of sound propagation indoors does not work for typical furnished rooms in dwellings and offices.An alternative simple empirical relationship has been found that predicts with considerable accuracy the sound pressure level, Lp, in such rooms, based on the sound power level, Lw, of the source, the room volume, V, the frequency, f, and the distance, r, from the source:Lp= Lw– 10 log r(ft)– 5 log V(cu ft)– 3 log f(Hz)+ 25 (dB)If this new relationship is accepted, there are serious implications for our current standard test procedures for field measurements in occupied buildings. Since the room absorption, A, does not appear explicitly in the formula, the customary normalization with10 log (A/Ao) in transmission loss and impact noise tests is probably incorrect In addition, since no uniform reverberant sound field occurs in normally furnished spaces, it is not clear what one ought to measure for the receiving-room sound pressure level in tests of transmission loss, noise reduction, and impact noise.