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四、零频的补偿# 从图2可看出,多重陷波器H_α(z)不仅将信号中干扰频率f_g及其谐波成分滤去,而且也滤去了零频附近的信号成分。这在某些情况下是不允许的。为此,对于被多重陷波器滤去的这部分信号,要在输出端加以补偿。由图2,信号经过H’_L(z)后,在它的输出中包含有干扰频率f_g及其谐波,还有零频附近的频率分量,如果在这一路输出中只保留所要的零频信号,将它加入到最终的输出信号中去,就完成了所要求的补偿。从H’_L(z)的输出中滤除f_g可以采用式(11)的结
Fourth, the zero-frequency compensation # As can be seen from Figure 2, the multiple notch filter H_α (z) not only the signal interference frequency f_g and its harmonic components filtered, but also filter out the zero-frequency signal components. This is not allowed under certain circumstances. To this end, for this part of the signal filtered by the multiple notch filter, to be compensated at the output. From Figure 2, the signal after H’_L (z), in its output contains the interference frequency f_g and its harmonics, as well as zero frequency near the frequency component, if only in this way the output of the desired zero-frequency The signal, adding it to the final output signal, completes the required compensation. Filtering f_g from the output of H’_L (z) can take the knot of equation (11)