数字滤波器在地震观测中的主要作用是：确保输出数据有较低的本底噪声和较大的动态范围，而不能以牺牲系统功耗为代价。需减小滤波器本身的运算量以节约系统功耗，从而提出滤波器的多级级联设计方案和高效算法，不采用传统的直接算法，可以降低滤波器本身的运算量和系统功耗。

In digital seismic observation，effect of the digital filter is to insure lower noises and high dynamic range of the output data, with low power cost of the system. So to lessen the operation amount of filter itself can save power of the system. In this paper, it is presented that the multiple stage scheme and high efficiency arithmetic of digital filter is suit to seismic observation; they can largely reduce the cost of power and operation amount of filter.