噪声衰减 meaning in English

noise degeneratiaon
noise degeneration

Computation of the noise attenuation factor in optimal associative mappings
最优联想映射噪声衰减因子的计算
Buildings and structures for agriculture - guide to noise attenuation
农用建筑物和构筑物.第32部分:噪声衰减指南
Standard test method for airborne sound attenuation between rooms sharing a common ceiling plenum
共用一个天花板中通风系统的房间之间气载噪声衰减率的标准测试方法
Through noise testing , we draw a conclusion that vibration of outer 1 / 3 which lies radius of diamond saw blade is more intensive than other place of it . however , the attenuation time ( 1 . 0s or so ) of damping saw blade is much faster than it of diamond saw blade without damping ( 15s or so )
采用敲击噪声测试，确定了在锯片的外三分之一处振动最为强烈，同时消音锯片的噪声衰减仅为1 . 0秒左右，比普通金刚石锯片( 15秒左右)快得多。