Earth filling behind the abutment of high-speed railway is different from conventional railway in the selection of padding, construction control and quality supervision.

高速铁路桥台台后填土从填料选择、施工控制、质量监测等方面均不同于常规铁路。

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Automation: Microprocessor controlled optical bench, digital speed control, automatic gain selection, advanced system check, automatic power saving mode.

自动化：微处理器控制光学台，数字化动镜控制，自动增益选择，高级的系统诊断，自动节电模式。

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The working principle, response characteristics and parameter selection rules, etc. are analysed. The software realizing method for speed signal processing in computer control is given out.

介绍了速度信号滤波器硬件电路的设计，分析了其工作原理、响应特性和参数选取原则等，给出了微机控制中速度信号处理的软件实现方法。

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