中文说明：包络谱的求取程序，已经过matlab运行，没有问题。
English Description：
Envelope spectrum of the program, has been run by MATLAB, no problem.
Matlab code to achieve envelope spectrum
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中文说明：包络谱的求取程序，已经过matlab运行，没有问题。
English Description：
Envelope spectrum of the program, has been run by MATLAB, no problem.