Resampling/Interpolate Data

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Hello,

How can i resample/interpolate the signal (Sig1). Sig1 has approx.99 Hertz and Sig2 has 500 Hertz.

First Column is the time. Second Column is the distance.

Thank you.

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Answer 1

Aabha 2025-2-6

编辑：Aabha 2025-2-7

在 MATLAB Online 中打开

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Hi Philipp,

You can downsample “Sig2” to match the sampling frequency of “Sig1”. This can be done using the “resample” function in MATLAB. Here is a reference code to help you with it.

distance = Sig2(:, 2); 
time = Sig2(:, 1); 
fs1 = 99; 
fs2 = 500; 
[p, q] = rat(fs1 / fs2); %resampling factor
distanceResampled = resample(distance, p, q); 
timeResampled = linspace(time(1), time(end), length(distanceResampled))';     
Sig2Resampled = [timeResampled, distanceResampled]; 

If you would like to interpolate the signals instead of resampling, you can use the “interp1” function in MATLAB. Here is a reference code for interpolation

timeSig1 = Sig1(:,1)'; 
distanceSig1 = Sig1(:, 2)'; 
timeSig2 = Sig2(:,2)'; 
distanceSig2 = Sig2(:, 2)'; 
interpolSig = interp1(timeSig1, distanceSig1, timeSig2, 'linear');