I have a setup where I record several analog signals. I want to clean up these signals using a low pass filter.

Something like this:

     
      float k = 0.5; //alpha level for lowpass function
      float cleanSignal; // global veriable for lowpass function
      void setup()
      {
      cleanSignal = 0; //initialize global value for lowpass function
      }
     
      void draw()
      {
      println (lowpass (*input/signal*, k));
      }
     
      float lowpass(float signal, float k)
      {                     //is k set globally? is cleansignal initialized globally and declared in setup?
      float oldSignal = cleanSignal;
      cleanSignal = oldSignal + (k * (signal - oldSignal));
      return cleanSignal;
      }
 

Now, the problem is, i want to be able to call the function with each of my signals i.e. dataA = lowpass (signalA, k); and dataB = lowpass (signalB, k);

Is there any way of writing one function which can filter each signal individually for me? Possibly using the static function?

Any tip would be apreceated.

Thanks

P.