With the measurement of average sound pressure level and sound power level, the noisereduction result of the oil pan made by sandwich steel plate was proved.
通过平均声压级和声功率级的测试验证了复合钢板试制的油底壳的降噪效果。
2
This algorithm can overcome the deficiency of the conventional algorithms of noisereduction, which were only efficient for stationary environments and have large level of signal residual noise.
对此,本文研究了一种非平稳环境下基于小波变换的信号去噪算法。
3
Their designs ensure operator safety as well as offering the highest level of noisereduction possible, easy access fro maintenance, all the while being efficient and cost effective.