说明：  本程序是用于信号频谱分析的实验程序 主要功能是进行信号的幅值谱计算；同时可完成在选定范围内谱峰的精确频率、幅值和相位计算。
(This procedure is the main function of the experimental procedure for signal spectrum analysis to calculate the amplitude of the signal spectrum to be completed by the precise frequency of the peak in the selected range, amplitude and phase calculation.)