Remove drift from signal
显示 更早的评论
How do I remove the drift from this signal? I want the "flat" lines in beginning and the end to be at the same level.
7 个评论
Image Analyst
2016-7-18
You forgot to attach a screenshot or data, so until you read this link about all I can suggest is to use polyfit and subtract the fitted/smoothed signal.
thestargazer
2016-7-18
thestargazer
2016-7-18
Tried with code:
opol = 1;
[p,s,mu] = polyfit(t1,phase1,opol);
f_y = polyval(p,t1,[],mu);
dt_phase1 = phase1 - f_y;
plot(t1,dt_phase1,'.');
Is there a way to only take the baseline into account for the slope?
Star Strider
2016-7-18
We need to have your time vector as well, since that is required to write code specific to your data. Add that, and upload the .mat file.
Image Analyst
2016-7-18
Exactly what/where do you consider the baseline to be? Can you draw it on there?
Star Strider
2016-7-18
There seems to be an integrated square-wave pulse in the centre half of the data. What are your data and how are you acquiring and initially processing them?
thestargazer
2016-7-19
编辑：thestargazer
2016-7-19
Image shows what I meant with baseline. Baseline 1 and Baseline 2 are suppose to be at same level, but I had a drift in my measurement (signal = intensity). I want to remove the drift without distorting (changing) the amplitude of my bump.
What I am interested of here is the amplitude of this "bump" and the response time.
Many thanks!
回答（1 个）
类别
在 帮助中心 和 File Exchange 中查找有关 Correlation and Convolution 的更多信息
产品
2016-7-18
2016-7-19
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
Translated by 
