时域平均法是从混有噪声的信号中提取周期性分量的最有效方法。
The time domain average method is an efficient method to extract period components from the signal mixed with noise.
针对这两方面的问题，提出了一种用全零点数字滤波器滤除周期性分量的滤波算法。
Aiming at these problems, this paper presents an efficient algorithm which use all zero digital filter for filtering the periodic component.
通过时域波形和频谱等基本分析手段来探测振动加速度信号中的周期性冲击分量往往是困难的。
It is difficult to detect the periodic impulse component in the vibration acceleration signal with conventional analysis methods such as time domain wave and frequency spectrum.
机械设备振动信号中是否存在周期性的冲击分量是其有无故障的重要标志。
Whether there exists a periodic impulse component in a vibration signal is an important sign of a mechanical device being faulty.
速度差各分量的变化具有很明显的周期性且与卫星轨道的运行周期相吻合。
The variations of velocity difference have obvious periodicity, which coincides with the satellite orbit period.
通常检测的机械振动加速度信号，由于信噪比太低，即使存在周期性的冲击分量也往往被淹没在强的背景噪声之中。
However, in respect of a vibration acceleration signal, the signal to noise ratio (SNR) is often so small that the periodic impulse component is submersed in its intense background noises.
结果表明：光场的两正交分量的涨落均可压缩，压缩程度受系统参数的影响，并且随时间呈周期性变化；
The results indicated that one of the two quadrature components of light field evolves periodically with time and can be squeezed, and the system parameters influence the squeezing depth;
结果表明：光场的两正交分量的涨落均可压缩，压缩程度受系统参数的影响，并且随时间呈周期性变化；
The results indicated that one of the two quadrature components of light field evolves periodically with time and can be squeezed, and the system parameters influence the squeezing depth;
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