The impact is going to be most clearly noted when the background-noise level goes up, when you have to focus on what someone is saying.

这种听力丧失的影响在背景噪音水平上升时表现的最明显，此时你不得不集中注意力才能听清楚某人的讲话。

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The experiments in different noise background show that the algorithm can adapt to the variation of the background noise level and reach high accuracy …

在不同背景噪声下的实验结果表明，该方法可适应背景噪声能量的变化，得到高正确率的词边界检测。

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The background noise level of this instrument under the condition of conducted disturbance and disturbance power test is provided.

讨论了监测待测物使用工况的必要性，给出了电流参量测试仪的传导骚扰和骚扰功率的背景骚扰电平。

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In the London area there's a constant low-level clacking noise in the background, reminiscent of the typing pools of yore.

BBC: Why air traffic control still needs the human touch

The essential ingredients of good open-plan office acoustics are evenly distributed sound-absorptive materials and a minimum level of background noise throughout.

BBC: The pleasures and perils of the open-plan office