地震数据采集器后级滤波器的设计

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。

The design of post-processing filters of earthquake data acquisition system

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 fil- ter,finite impulse response （FIR1） filter with decimation ratio of four and finite impulse re- sponse （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 passhand and attenuation in the stopband both satisfy the stipulation on China digital seismograph network.