给定采样频率fs，两个正弦信号相加，两信号幅度不同、频率不同。要求给定正弦信号频率的选择与采样频率成整数关系和非整数关系两种情况，信号持续时间选择多种情况分别进行频谱分析。(Given the sampling frequency FS, two sinusoidal signals are added, and the two signals are different in amplitude and frequency. It is required that the frequency selection of a given sine signal and sampling frequency have integer and non integer relations in two cases, and the signal duration is selected in various situations respectively for frequency spectrum analysis.)