为了调节记录的开头部分和尾端的振幅电平，通常采用专门的增益控制。
Special gain controls are used to regulate the amplitude levels at the beginning and end of the record.
该装置采用了自动基线调整，自动增益设置，数字滤波，数据压缩等技术，可进行长时间动态记录。
Automatic adjustment of datum line, Automatic gain control, digital filter and data compression are adopted in it, and it can make long-term dynamic record.
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