中文说明：这个有中文注释，看得明白，包括调制，解调，信噪比计算，采用累计贡献率的方法。
English Description：
This one has Chinese annotation. You can see it clearly, including modulation, demodulation, signal-to-noise ratio calculation, and the cumulative contribution rate method.
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中文说明：这个有中文注释，看得明白，包括调制，解调，信噪比计算，采用累计贡献率的方法。
English Description：
This one has Chinese annotation. You can see it clearly, including modulation, demodulation, signal-to-noise ratio calculation, and the cumulative contribution rate method.