I have got three signals, acc_x, acc_y, acc_z. I need to compose them in order to compute the magnitude of the acc. I would like to ask the following question:

what is better opt1 or opt2? or opt3?:

**opt1**: first apply a filter to reduce the noise to each single signal and then compute the magnitude or, 

**opt2**: first compute the magnitude and then apply a filter to the composed to reduce the noise? 

**opt3**: Any other good suggestion? 

Any of your suggestion would be very appreciated.

Thank you in advance.

Best Regards, Carlo


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