三级运算
三级运算-
各级运算能力的发展状况不一，一二级运算能力水平发展稳定上升，三级运算能力水平发展平缓。
The operation ability in all levels develops differently . The one in the first and second levels develop steadily while the third one develops slowly .
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和一级低通滤波器比较说明，所设计的三级抽取滤波器，运算量小、滤波效果好。
Compared with the one stage low-pass filter , the designed three stage decimation filter has much less computation and better tilter character .