How to Correct Signal Waveform (may use some filter)

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Runzi Hao
Runzi Hao 2023-5-2
评论： Runzi Hao 2023-5-3
Hello, I would like to ask is there a way to process below data so that, when y goes from -1 to 1 (or from 1 to -1), there are no small dips near 1 (or -1). The force applied to generate such data has squre waveform. But my data waveform is distorted.
I have tried using lowpass(), but the dips are still there. Data and figure are attached.
Manny thanks and best regards,
Ryanne
  1 个评论
Runzi Hao
Runzi Hao 2023-5-2
编辑：Runzi Hao 2023-5-3
Also I hope the near 1 (or near -1) signals before the dips can be increased to 1 (or -1).
The sampling rate is 1e11 Hz. Data in first column is in nanoseconds.

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Chunru
Chunru 2023-5-3
Ran in:
You can try to use a low pass filter.
websave("data.mat", "https://www.mathworks.com/matlabcentral/answers/uploaded_files/1372834/ask_matlab_community.mat")
ans = '/users/mss.system.ENlxcn/data.mat'
load data
% design a low pass filter
d = designfilt("lowpassfir", PassbandFrequency=0.04, StopbandFrequency=0.12, ...
PassbandRipple=1, StopbandAttenuation=60);
x = filtfilt(d, dataAsk(:,2));
plot(dataAsk(:,1), dataAsk(:, 2))
hold on;
plot(dataAsk(:,1), x)

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