fan filter是什么意思

用法例句

In the paper, a new method to search the coefficients of the McClellan transformation is introduced A 2 D zero phase FIR fan filter based on frequency transformation was designed and applied to seismic data filters The result demonstes that the filter is practicable in the seismic data processin

介绍一种求ＭｃＣｌｅｌａｎ变换系数的新方法，并用频率变换法设计了一个二维零相位ＦＩＲ扇形滤波器，用于地震数据滤波，证明了频率变换设计法设计的二维ＦＩＲ滤波器在地震数据处理上的实用性。

A new method of folding segmental filter paper;

扇形滤纸的一种新的折叠方法

Because the numbers of PGPR echo signal is very large and the current method that choose the parameters of sector filter manually is inefficient,the paper presents a method to choose the parameters of sector filter automatically based on region growing.

针对相控阵探地雷达回波信号数据量大,目前人工选择扇形滤波器参数效率低这一问题,提出了将雷达回波信号的频率-波数谱作为一幅灰度图像,利用区域生长的图像分割方法自动确定滤波参数,以进行扇形滤波,并除去直达波及噪声干扰。