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说明： 实验目的：对带通信号及其低通等效信号进行分析和仿真。
实验内容：
1、参考教材P24面例子，考虑如下带通信号，编写仿真程序实现，得出仿真结果。
（1） 画出该信号和它的幅度谱；
（2） 求出该信号的解析信号，并画出它的幅度谱；
（3） 求出并画出该信号的包络；
（4） 分别假设 和 ，求该信号的低通等效，并画出它的幅度谱。
2、设带通信号为：
通过Matlab编程仿真实现：
（1） 画出该信号和他的谱函数（包括幅度和相位）
（2） 确定并画出解析信号的谱函数（包括幅度和相位）
（3） 画出该信号的包络。
（步骤一，二中，设采样间隔为ts=0.002s）。
(Purpose: To Bandpass and lowpass equivalent signal analysis and simulation. Experiment: 1, reference materials P24 plane example, consider the following bandpass signals, writing simulation program implementation, simulation results obtained. (1) Draw the signal and its amplitude spectrum (2) Find the analytical signal of the signal, and plot its amplitude spectrum (3) Find and draw the envelope of the signal and (4) respectively assumptions and seeking the equivalent lowpass signal and draw its amplitude spectrum. 2, is provided with a communication number: Simulation by Matlab programming: (1) Draw the signal and his spectral function (including amplitude and phase) (2) to identify and draw the analytic signal spectral function (including amplitude and phase) (3) Draw the envelope of the signal. (Step one, two, and set the sampling interval ts = 0.002s).)
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