is a digital filter necessary?

[nesppi]

Hello! i am implementing a code to read the signal of an optical
decoder joint to a motor . I don't know if before the codification of
the position it is necessary to filter the signals from the encoder...
does somebody know it?
thanks in advance
bye

 

[reto.knaak]

It depends on how "dirty" the signals are, so from your particular
environment/layout/shielding!
I would say: some simple filters won't hurt in any case...