Phase spectrum without knowing frequency

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abaza 2019-8-15

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https://ww2.mathworks.cn/matlabcentral/answers/476264-phase-spectrum-without-knowing-frequency

评论： Star Strider 2019-8-15

Hi to Matlab Community!

I would appreciate if anyone knows if possible to phase a spectrum if you have only the x,y data. Namely if you look at the attached picture, I woyldl ike to ask you if there is any prossibilty to phase the below spectrum to look like the above???

Thnak you for your help!

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采纳的回答

Star Strider 2019-8-15

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https://ww2.mathworks.cn/matlabcentral/answers/476264-phase-spectrum-without-knowing-frequency#answer_387699

The lower trace appears to be the negative derivative of the upper trace.

So integrating the negative of the lower trace and adding a constant-of-integration could approximate the upper trace. With only an image and no vectors to experiment with, this is as close as I can get.