transfer function 只是计算两个声室声压之差,结果偏大。 但适合任何情况。
effective transmission loss 则考虑中间的连接,结果比较可信。但存在的问题:
a.the cavities are connected to the transmission path of interest only, not to any additional subsystems,
b.and there is no significant damping in the intervening transmission path compared to the damping in the cavities.