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本文对基于窗函数设计方法的ＦＩＲ滤波器进行了特性分析，并采用Ｈａｍｍｉｎｇ窗函数设计了ＦＩＲ滤波器。在兼顾实时性要求的基础上，用Ｖｉｓｕａｌ Ｃ＋＋编制了计算程序，应用在车辆换档试验的数据采集系统中，效果良好。
In this paper, the FIR filter based on the window function design method is analyzed, and the Hamming window function is used to design the FIR filter. On the basis of taking into account the real-time requirements, using Visual C ++ prepared a calculation program, the data acquisition system used in vehicle shift test, the effect is good.