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.
新的方向滤波器组具有良好的方向和频率选择性。
The new DFB can provide good directional and frequency selectivity.
对数字载波的频率及频谱成形滤波器的特性参数的选择提出了建议。
The author also makes some Suggestions for frequency selection of digital carrier and parameters selection of spectrum shaping filter.
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