倍频程分析，内有详细注释，程序生成四张图片，容易理解(Octave analysis, there are detailed notes, the program generates four pictures, easy to understand)

三分之一倍频程函数，将时程结果进行1/3倍频程分析，得到振级结果(octave analysis, which carries out 1/3 octave band analysis for a time-domain signal and converts it into vibration level resutls)