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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The distance between the acoustic-emission source and the receiving transducer, and the background noise level are primary factors in selecting a particular frequency band.

声发射源与接收讯号传感器间的距离以及环境噪声的电平是选择频带的主要依据。

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A major cause of errors in speech recognition is the inaccurate detection of word bound-ary. Conventional methods can not work well in the condition of low SNR and variable background noise level.

词边界检测误差是语音识别中产生错误的主要原因之一，常规的检测算法在低信噪比尤其在背景噪声能量可变的环境下不能有效工作。

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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

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

In the US, that level of coverage starts to become background noise.

FORBES: Autism Is Not Just An American Thing