Due to hand movements very noisy signal i get. I need to know when we normalise the data and which filter i should apply?
Filtering the signal might help. The choice of the filter depends on the type of artifacts you see in your signal and the desired outcome. I'll assume that you want to perform R-peaks detection. You say that there were many hand movements, which I assume cause waves in the ECG isoelectric line, which should normally be flat. If so, apply high pass filter with 5 Hz cutoff. Conversely, if your signal is contaminated with high frequency noise but you can still somewhat see the PQRST complex, apply low pass filter with 35 Hz cutoff. If you are unsure you can also filter the signal with 5-35 Hz band pass filter and see whether the signal improves.
Thank you so much, Tomáš Dominik Sir! I am attaching my ECG signal here. please have a look at it.
I think first you can apply 50 HZ filter if its not applied earlier and then you can think other filters
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