The effect of the back-ground noise is effectively rejected due to the bispectral technology.

由于采用了双谱技术，脑电背景噪声的影响得到有效的抑制。

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The article calculates the mean square root values of pulse noise, observational dynamic range and power spectrum of ground noise of all seismic station bases.

得出了各地震台台基的脉动噪声的均方根值、观测动态范围、地噪声功率谱。

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Due to its low power spectral density, the direct sequence spread spectrum signal is always submerged with the back-ground noise, so that it is difficult to reconnoiter the signal.

直接序列扩频信号具有较低的功率谱密度，信号淹没在背景噪声中，侦查难度较大。

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Please don't be diverted by the ground noise and the static.

CNN: McCain: Change is coming

The passengers in the aeroplane flying low overhead do not pay for the disturbance the engine noise causes on the ground.

ECONOMIST: Taxes for a cleaner planet

That is because the tradition of setting off firecrackers during this time of the year causes a large amount of noise, air and ground pollution.

BBC: Taipei residents urged to use CDs not firecrackers