Hearing protectors - Safety requirements and testing - Part 5: active noise reduction ear-muffs.
听力保护器。安全要求和试验。第5部分：有源降噪耳罩。
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。
Most of active headsets, which use fixed analog feedback controllers, are not able to maximize the noise reduction.
目前有源耳罩大都采用固定的模拟反馈控制器，不能够最大限度地消除低频噪声。
Most of active headsets, which use fixed analog feedback controllers, are not able to maximize the noise reduction.
有源耳罩作为有源噪声控制技术一个重要的应用方向，已经取得了许多的成果。
Most of active headsets, which use fixed analog feedback controllers, are not able to maximize the noise reduction.
有源耳罩作为有源噪声控制技术一个重要的应用方向，已经取得了许多的成果。
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