是信号处理的基础，是本科毕设的题目，对于初学者具有参考意义，处理信号的时频分析，包括面积、周长、矩形度、伸长度。-Is the basis of the signal processing, The title of the commercial is undergraduate course you For beginners with a reference value, When processing a signal frequency analysis, Including the area, perimeter, rectangular, elongation.