记住对于选择正确的滤波器系数，采样频率很重要。
Remember that the sample rate is very important to choosing the right coefficients.
APDFT方法兼有窗函数法和频率采样法的优点，是一种设计FIR滤波器的新方法。
The APDFT method is a new scheme for FIR filter design, possessing concurrently the merits of the windowing and the frequency sampling method.
采样频率极高的DAQ系统采用一些低通滤波器过滤掉波形在250 Hz以上的信号。
Rather than sample at extremely high frequencies, these DAQ systems implement some low-pass filters that cut out waveforms above the 250 Hz.
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