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摘要：为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。试验结果表明，该滤波器设计方法显著降低了FPGA的片内硬件开销，提高了滤波器的运算速度，并具有良好的降噪效果。
关键词：超声波；信号；FPGA；FIR滤波器
0 引言
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