在国内外普遍使用的细栅距幅光栅叠栅条纹系统中，衍射效应是很明显的，这是造成叠栅条纹信号的衬比（度）和正弦性不好的主要原因。
In an amplitude grating system of small grid pitch, the diffractive light is the main cause to deteriorate the contrast and sinusoidal property of Moiré signals.
讨论了由于间歇信号嵌入导致经验模式分解结果出现模态混叠的现象，指出极值点序列幅值突变是产生模态混叠的根本原因。
The reason to mode mixing in the result of empirical mode decomposition is discussed in respect of the variation of extremum series.
讨论了由于间歇信号嵌入导致经验模式分解结果出现模态混叠的现象，指出极值点序列幅值突变是产生模态混叠的根本原因。
Aiming at the mode mixing problem caused by intermittency signal in the sifting process of empirical mode decomposition (EMD), a new solution is presented.
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