According to the formed CD recording information, the principle of digital processing system, audio error correcting code and EFM technology is analyzed and explored.

结合激光唱片记录信息形成过程，对音频数字处理系统。音频纠错编码及EFM调制技术等原理做了分析、探讨。

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Compared with simulant earthquake, digital earthquake has improved a lot in dynamic range, resolution ratio, amount of information, system precision and data processing conversion etc.

与模拟地震观测相比，数字地震观测在动态范围、分辨率、信息量、系统精度、资料处理转换等方面有了很大提高。

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