了降低超声波流量检测过程中噪声对检测精度的影响，采用FPGA器件构建了FIR滤波器，并提出一种新颖的查表法替代滤波器中的乘法运算-In order to reduce the flow in the process of ultrasonic testing noise on the influence of the precision, based on FPGA device constructed the FIR filter, and put forward a novel queryi