Here, secondary treatment methods are introduced in detail, include time domain signal statistics character, frequency analysis fast Fourier transform (FFT), and short time Fourier transform (STFT).
这里，主要对二次处理的方法作了详细的介绍，包括时域信号的统计特征，频域分析的傅立叶变换和短时傅立叶变换。
It made a study of training structure character of fitness and special skill exercise of speed-power events of athletics by methods of documents, character analysis interview and statistics.
运用文献资料、特征解析、访谈和数理统计等研究方法，对田径速度力量性项目运动员的身体素质与技术训练结构特征进行研究。
In the article, the principle of the Reverberation-Chamber, the model of theory analysis, character of statistics, and some problem in design the Reverberation-Chamber had been introduced tersely.
文中简单介绍了混波室的工作原理，理论分析模型，统计特性，混波室设计中的若干问题。
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