837工程中长周期地震计中短周期信号的提取

介绍从８３７工程中长周期摆中提取短周期信号的工作，其意义是利用现有的８３７工程中长周期摆增加区域台网的近震控制能力。该项工作主要是设计一个带有特殊滤波器的前置放大器，此滤波器在选取归一化参数时要求，以达到抑制低频而提取所需高频信号的目的。

Useful short-period signal extracted from moderate and longperiod seismometer used in project 837

This paper introduces the work extracting short-period signal from moderate and long-period seismometer used in project 837, to strengthen micro-earthquake control ability of Shanghai Network. The work mainly includes design of a special filter in a preamplifier. The normalized parameter of the filter should meet the relation so as to restrain the low-frequency signal and extract the useful high-frequency signal.