Phase spectrum without knowing frequency
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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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Star Strider
2019-8-15
1 个投票
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.
4 个评论
abaza
2019-8-15
Star Strider
2019-8-15
My pleasure.
Try this:
D = load('phase.mat');
Good = D.Good;
notphased = D.notphased;
int_np = cumtrapz(notphased(:,1), notphased(:,2)); % Integrate
IntConst = mean(Good(:,2) - int_np); % Calculate Constant Of Integration
figure
plot(Good(:,1), Good(:,2))
hold on
plot(notphased(:,1), notphased(:,2)./100)
plot(notphased(:,1), int_np)
plot(notphased(:,1), int_np+IntConst, '--r', 'LineWidth',1.5)
hold off
grid
legend('Original','Not Phased','Integrated Not Phased','Constant-Corrected Integrated Not Phased', 'Location','SE')
producing:
abaza
2019-8-15
Star Strider
2019-8-15
As always, my pleasure!
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