设计了改进的FIR数字滤波器，实现了对原始输出信号的实时滤波处理，有效地抑制了噪声的干扰，为科氏质量流量计的高精度测量提供了保证。
The improved FIR filter is designed and used for filtering original signals, so the noise is restrained effectively and the measurement precision of the mass flowmeter is guaranteed.
田间试验证明，通过实时标定，测产系统具备以较高精度进行谷物流量测量的能力。
Field test proved that the real time calibration method significantly improved the measurement accuracy of grain flow.
由于流量计对测量系统的精确性和实时性要求较高，所以采用专门的数据处理芯片和数字鉴相技术。
Because of the request of accuracy and the performance of real time, this ultrasonic flow meter USES the special data processing chip and digital phase technology.
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