以ADS1281为例，介绍新一代地震数据采集器后级滤波器设计。该后级滤波器包括变抽样率的梳状滤波器、有限脉冲响应（FIR1）4抽1滤波器和有限脉冲响应（FIR2）2抽1滤波器。其中，FIR1 4抽1滤波器和FIR2 2抽1又分为最小相位、线性相位和瞬态3种滤波器，文中使用设计的最小相位滤波抽取器对仿真的正弦波进行滤波验证，结果表明，通带波动和阻带衰减满足中国数字测震台网技术规程的要求。

Taking ADS1281 as an example, the postprocessing filter design in new data acquisition recorder is introduced in the paper. The filter is composed of variable sampling rate comb filter，finite impulse response (FIR1) filter with decimation ratio of four and finite impulse response (FIR2) filter with decimation ratio of two. Among FIR1 and FIR2 filters, they are divided into minimum phase, linear phase and instantaneous filter. A test that filters the simulation sine wave using minimum phase filter is done in the paper. The simulation results indicate that peaktopeak ripple in the passband and attenuation in the stopband both satisfy the stipulation on China digital seismograph network.