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。

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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。

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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。

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And Active Noise Reduction provides a more detailed and realistic viewing experience by reducing unwanted noise and distractions.

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This card also includes the high-quality beam-forming microphone, allowing advanced voice communication without the need for the headset by leveraging CrystalVoice Echo Cancellation, CrystalVoice Focus and CrystalVoice Active Noise Reduction.

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The handset offers new support for two technologies: Active Noise Reduction technology, which performs noise processing in a manner that best suits the image, and Sharpness Equalizer technology, which produces a clear picture by adjusting the contours of the photo.

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