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I am new to signal processing and I am working on Filtring signals(using basic analog filters, FIR filters, and IRR filters), for Human activity recognition, using sensor data, I Extract the features before filtering the signal, Then I filter the signal, and I want to know how can we interpret the new values of the features after filtering the signal like the change in mean values (what does this means), the change in Standard deviation ?.....the basic temporal and frequency domain features?.

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