Calculation of empirical frequency and selection of frequency distribution model form two most important segments in the formula of urban stormy statistics.
城市暴雨公式统计中最重要的两个环节就是经验频率的计算和频率分布模型的选择。
Firstly, the best wavelet basis selection was conducted via message entropy function; then the gas load was decomposed to low frequency signal and high frequency signal by two times through it.
首先用信息熵函数最小选择最优小波基，然后用其对燃气负荷进行二层分解得到负荷的低频信号和高频信号。
Two key questions, selection of sampling period and phenomenon of frequency aberrance, must be considered when the continuous notch filter is discretized.
本文讨论了离散化时需重点考虑的两个问题：采样周期的选取和频率畸变。
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