每个离散的数据片断需要大量结构，所以有效数据的比例非常低。

Each discrete piece of data requires a lot of structure, and the ratio of data to structure is extremely low.

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分析了在离散状态下比例因子对不变矩特征的影响，构造了一种新的不变矩，使其具有平移、旋转和比例因子的不变性。

This paper analyses the influence of scale factor on moment invariant features in discrete, constructs a new moment invariant with both scale, translation and rotating invariance.

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数值计算结果表明，随时间抖动范围增大和频率提高，离散功率谱分量所占比例下降。

The numerical results demonstrate that the larger the zone of timing jitter and the higher the frequency, the less proportion the discrete PSD component is in the total PSD.

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