lowpass.py 文件源码

def process(self, obj_data):
        ''' 
        Apply lowpass filter to data set

        @param obj_data: Input data. Changes are made in place.
        '''

        column_names = obj_data.getDefaultColumns()

        ntaps = self.ap_paramList[0]()
        fpassf_per = self.ap_paramList[1]()
        fstopf_per = self.ap_paramList[2]()
        wghts = self.ap_paramList[3]()
        miter = self.ap_paramList[4]()
        b_filt=signal.fir_filter_design.remez(numtaps=ntaps,
                                              bands=[0,fpassf_per,fstopf_per,.5],
                                              desired=[1,0],weight=wghts,maxiter=miter)

        for label, data in obj_data.getIterator():
            for column in column_names:
                obj_data.updateData(label, data.index, column, signal.filtfilt(b_filt,1,data))