在IPO和FDTD之间场耦合中，通过提取“本底噪声”来提高数值精度。

For the coupling between IPO with FDTD fields, the "background noise" is picked up to improve numerical precision.

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为降低轿车主减速器噪声测试试验台本底噪声，其传动系统采用了四对三角胶带传动。

The V belt wheels of noise experimental table of main carriage reduction gear must suit drive ratio, be lightest in weight and least in moment of inertia .

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结果表明，方法误差与随机噪声的性质有关：在本底噪声为主时，二次曲线拟合法精度高，计算量小。

The result shows that the parabolic fit method has a high precision with fewer computing time when the background noise is the main noise source.

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另外，快速傅里叶变换方法由于不受本底噪声影响，可以不必在信号处理时去掉本底噪声，因而可以明显缩短测量时间。

In addition, the FFT method is immune to the background noise of the signal, so that the process of signal-processing by the FFT method can advanced.

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另外，快速傅里叶变换方法由于不受本底噪声影响，可以不必在信号处理时去掉本底噪声，因而可以明显缩短测量时间。

In addition, the FFT method is immune to the background noise of the signal, so that the process of signal-processing by the FFT method can advanced.

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