In a practical example, a good result is obtained by the adoption of step-varying TD and predicting under the condition of sampled signal with noise and sampled time varying.
在一个采样时间不固定，且采样信号带有噪声的应用实例中，采用变步长的跟踪微分器加预报的方法得到了较好的结果。
Compared with the original two kinds of Phase-Difference Correction, only one sequence of time-domain signal is sampled and FFT analysis of same points is performed twice in this method.
与原两种相位差法相比，这种方法只采一段时域信号，且进行两次相同点数的FFT分析。
Before test the ultrasonic propagation time, we also use the digital filtering algorithm in the sampled signal to better eliminate noise and improve accuracy.
在进行超声波传播时间检测前，对采样信号还进行了数字滤波算法以更好的消除噪声影响，提高检测精度。
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