Firstly, the vortex noise can be reduced mainly through the optimization of the geometric parameters of the impeller and volute and installing a rotation diffuser in the outlet of the impeller.

首先，对于多翼离心风机涡流噪声的降噪，主要通过优化叶轮、蜗壳的结构几何参数和在叶轮出口加装旋转扩压器等方式进行。

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Taking the noise elimination of the outlet temperature signal of hydrocracking reactor as an example, the effect of the model parameters of the wave filter for noise elimination was compared.

在分析线性滤波器原理的基础上，建立了化工系统动态信号的最优线性滤波器的数学模型，并以加氢裂化反应器出口温度信号的除噪为例比较了滤波器模型参数对去噪效果的影响。

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New underwater exhaust outlet reduced noise levels while allowing peak performance.

新的水下排气口降低噪音水平，同时允许的峰值性能。

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Each of the airline's business-class seats will offer video on-demand on a 15.4-inch television, iPod-playing capability through an in-flight entertainment system, a USB port and power outlet, and noise-canceling headphones.

FORBES: Magazine Article