Second, developing the sound transmission loss measuring system.
第二，声学材料隔声量测量系统的构建及测量。
Active noise control technology has recently been used to increase the sound transmission loss of double wall structures.
噪声主动控制技术目前已用增加双隔板结构对声音进行衰减。
Through testing on muffler on a certain motor, the paper evaluates the static performance of sound transmission loss of the muffler.
通过对某种发动机使用的消声器进行测试，对消声器的静态传声损失性能作出评价。
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