它减少了波形失真度和平均叠加次数，提高了生物医学信号提取水平。
Extraction level of biomedical signals is improved by reducing wave distortion and average superposition times.
在地震资料信噪比比较低，叠加次数比较低的情况下，常规处理效果不好，可以采用分频处理。
In the case that the signal-to-noise ratio and the number of times of superimposition are both rather low, the routine processing is not effective, and frequency division processing may be used.
针对浅层地震资料目的层较浅、叠加次数少和城市背景干扰大等特点，文中对速度分析的参数选取问题进行了研究。
Considering the properties of low stack folds, shallow objected layers and big background noise of shallow seismic data, the parameters selection for velocity analysis is studied in the paper.
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