Design of microseism signal collection system with high dynamic range

In order to improve collection range and signal noise ratio, a microseism signal collection system with high dynamic range was designed. The system selects amplifier gain according to magnitude of collected signal, and adjusts the signal to suitable A/D sampling range. The adjusted data is processed through digital filter and transmitted to upper computer by RS422 interface. The test results show that the system can accurately collect microseism signals of different strength with 136 dB dynamic range.