对于测震观测,大动态和宽频带是当代最主要的技术特征,其关键设备是反馈地震计和24位数据采集器.通过引入调制解调技术来克服由于半导体器件低频噪声和环境温度变化引起的长周期漂移,提高长周期频段数据采集的技术水平.%For the seismic observations, large dynamic and broadband is the most important technical features of the contemporary era. The key device is a feedback seismometer and a 24-bit data acquisition system. Low-frequency noise which is in semiconductor chips has affected the observation in long period, and becomes the important factor in improving the seismic observations. The internal noise of electronic devices (especially on 1// noise, represented by low-frequency noise) is a key indicator which limit sensitivity and accuracy of device. In this paper, the modulation and demodulation technique is adopted to overcome the long-period drift caused by the low frequency noise of semiconductor devices and ambient temperature changes. It can improve the long-period band data acquisition technique.
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