ISO 12354-4:2017规定了一种计算模型，主要通过建筑物内测量的声压级和表征建筑物外壳内相关元件和开口的声音传输特性的测量数据，来估计建筑物外壳因空气传播声音而辐射的声功率级。这些声功率级与建筑围护结构内部或前方的其他声源的声功率级一起，构成了计算距离建筑物选定距离处的声压级的基础，作为建筑物声学性能的衡量标准。 根据室内声源的知识预测室内声压级不在本文件范围内。 室外声音传播的预测不在本文件的范围内。 注:对于简单传播条件，附录E中给出了估算声压级的方法。 ISO 12354-4:2017描述了计算模型的原理，列出了相关数量，并定义了其应用和限制。

ISO 12354-4:2017 specifies a calculation model to estimate the sound power level radiated by the envelope of a building due to airborne sound inside that building, primarily by means of measured sound pressure levels inside the building and measured data which characterize the sound transmission by the relevant elements and openings in the building envelope. These sound power levels, together with those of other sound sources in or in front of the building envelope, form the basis for the calculation of the sound pressure level at a chosen distance from a building as a measure for the acoustic performance of buildings. The prediction of the inside sound pressure level from knowledge of the indoor sound sources is outside the scope of this document. The prediction of the outdoor sound propagation is outside the scope of this document. NOTE For simple propagation conditions an approach is given for the estimation of the sound pressure level in Annex E. ISO 12354-4:2017 describes the principles of the calculation model, lists the relevant quantities and defines its applications and restrictions.