Natural mode analysis has proved to be a useful tool to predict low frequency sound transmission in rectangular rooms. Analytical models based on this theory have been developed in order to identify the factors which control impact and airborne sound transmission at low frequencies. In the case of impact sound transmission, the model applies to the sound field generated in the receiving room by point excitation of homogeneous plates, where floating plates can also be considered. For airborne sound transmission, the model also considers the sound field in the receiving room generated by vibrating homogeneous plates, where the excitation is assumed as the sound pressure over the floor surface in the emitting room. Laboratory measurements confirmed that both models are adequate for estimating sound transmission at low frequencies. The model for impact sound transmission also has been validated by in situ measurements.
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