Noise reduction type: can effectively reduce the noise.
降噪型：能有效降低噪声。
L. f. noise can be better attenuated so as to obtain good attenuation characteristics over the entire audible frequency range by using active noise reduction technique in the closed-air type earmuff.
在密闭型耳罩中，利用有源降噪技术可以较好地衰减低频噪声以使整个可听声频率范围内获得良好的衰减特性。
Sandwich type panel structure, the middle of flame retardant and heat insulation and noise reduction material, has the fire performance of A0 class.
三明治夹层式面板结构，中间加阻燃隔热降噪材料，具有A 0级防火性能。
Noise of bag-type dust filter is analyzed too, the results indicated that air flow noise is existed in the bag-type dust filter, needs to adopt the silencing measure for noise reduction.
对袋式除尘器噪音进行分析，结果表明袋式除尘器存在气流噪音，需要采取消音措施降噪。
According to the spectral characteristic of the noise source, the tube-type muffler, metal-enclosure muffler, structural-type muffler can be equipped before and after the noise reduction devices.
根据声源的频谱特性在其前后配置合理的管道式消声器、金属外壳式消声器、结构式消声器作为消声降噪的措施。
According to the spectral characteristic of the noise source, the tube-type muffler, metal-enclosure muffler, structural-type muffler can be equipped before and after the noise reduction devices.
根据声源的频谱特性在其前后配置合理的管道式消声器、金属外壳式消声器、结构式消声器作为消声降噪的措施。
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