确切的解释是通过附加滤波器确定，但往往是一个文件描述符。
The exact interpretation is determined by the attached filter, but often is a file descriptor.
本文建议一种多维递归数字滤波器的并行算法，其于常规次第算法相比，不造成任何附加算术运算；
The proposed parallel algorithm of multidimensional recursive digital filtering does not cause any additional arithmetic operations, compared with the conventional sequential filter algorithm.
对陷波滤波器进行了改进，使得引入控制系统通频带的附加相移减小，降低了对系统控制性能的影响。
The modification of the notch filter made the extra phase-shifting introduced to the control system passband reduced and so the control performance was improved.
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